JTextField.setText() please help...
i have a field in my table that is in date format.
txtempdate.setText(rsmastempl.getDate("empdate"));
this produce an error.
how will i display my date filed in my table in a TextBox?
thank you for helping.
killuasoft
Christ boy! Did that hurt?
Try txtempdate.setText(String.valueOf(whatever));
I'm pretty drunk now, so I'm gonna hit the party.
L8r
Similar Messages
-
How to empty the JTextField automatically? Please HELP me.
Hello,
This is my full listing program:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.event.*;
import javax.swing.border.*;
public class PortGUI extends JFrame
private JButton btOk;
private JButton btCancel;
private JButton btReply;
private JLabel lblServIP;
private JLabel lblAuth;
private JLabel lblThrd;
private JLabel lblAcc;
private JLabel lblMax;
private JLabel lblAuthent;
private JLabel lblAdm;
private JLabel lblReplServ;
private JCheckBox chkUsers;
private JCheckBox chkEnbDbg;
private JOptionPane pnlErr = new JOptionPane();
public PortGUI()
// Create main panel
JPanel topPanel = new JPanel();
topPanel.setLayout(null);
getContentPane().add( topPanel );
// Create Server Settings panel
JPanel panelsett = new JPanel();
panelsett.setLayout(null);
panelsett.setBounds(5,5,680, 200);
// panelsett containers
final JTextField fldServIP = new JTextField();
fldServIP.setBounds( 160, 30, 100, 25 );
fldServIP.setFocusAccelerator( 'v' );
panelsett.add(fldServIP);
lblServIP = new JLabel( "Server IP" );
lblServIP.setBounds( 20, 30, 100, 25 );
lblServIP.setLabelFor( fldServIP );
panelsett.add(lblServIP);
final JTextField fldAuth = new JTextField();
fldAuth.setBounds( 600, 30, 50, 25 );
fldAuth.setFocusAccelerator( 'v' );
panelsett.add(fldAuth);
lblAuth = new JLabel( "Incoming Radius Authentication Port");
lblAuth.setBounds( 350, 30, 300, 25 );
lblAuth.setLabelFor(fldAuth);
panelsett.add(lblAuth);
final JTextField fldThrd = new JTextField();
fldThrd.setBounds( 160, 60, 50, 25 );
fldThrd.setFocusAccelerator( 'a' );
panelsett.add(fldThrd);
lblThrd = new JLabel( "Worker Threads" );
lblThrd.setBounds( 20, 60, 100, 25 );
lblThrd.setLabelFor(fldThrd);
panelsett.add(lblThrd);
final JTextField fldAcc = new JTextField();
fldAcc.setBounds( 600, 60, 50, 25 );
fldAcc.setFocusAccelerator( 'a' );
panelsett.add( fldAcc );
lblAcc = new JLabel( "Incoming Radius Accounting Port" );
lblAcc.setBounds( 350, 60, 300, 25 );
lblAcc.setLabelFor( fldAcc );
panelsett.add( lblAcc );
final JTextField fldMax = new JTextField();
fldMax.setBounds( 160, 90, 50, 25 );
fldMax.setFocusAccelerator( 'c' );
panelsett.add( fldMax );
lblMax = new JLabel( "Maximum Consoles" );
lblMax.setBounds( 20, 90, 200, 25 );
lblMax.setLabelFor( fldMax );
panelsett.add(lblMax);
// Create combo box
String[] AuthStrings = {"Local Server", "Proxy Server", "Local and Proxy"};
JComboBox AuthList = new JComboBox(AuthStrings);
AuthList.setSelectedIndex(2);
AuthList.setSelectedItem(null);
AuthList.setBounds(450, 90, 200, 25);
panelsett.add(AuthList);
lblAuthent = new JLabel( "Authenticator" );
lblAuthent.setBounds( 350, 90, 100, 25 );
lblAuthent.setLabelFor( AuthList);
panelsett.add(lblAuthent);
final JTextField fldAdm = new JTextField();
fldAdm.setBounds( 160, 120, 50, 25 );
fldAdm.setFocusAccelerator( 'c' );
panelsett.add( fldAdm );
lblAdm = new JLabel( "Admin TCP Port" );
lblAdm.setBounds( 20, 120, 150, 25 );
lblAdm.setLabelFor( fldAdm );
panelsett.add(lblAdm);
// create checkbox
chkUsers = new JCheckBox("Cache Users in Memory");
chkUsers.setBounds(350, 120, 250, 25);
chkUsers.setMnemonic('m');
chkUsers.setSelected(false);
panelsett.add(chkUsers);
final JTextField fldReplServ = new JTextField();
fldReplServ.setBounds( 160, 150, 100, 25 );
fldReplServ.setFocusAccelerator( 'c' );
panelsett.add( fldReplServ );
lblReplServ = new JLabel( "Replication Server IP" );
lblReplServ.setBounds( 20, 150, 200, 25 );
lblReplServ.setLabelFor(fldReplServ);
panelsett.add(lblReplServ);
chkEnbDbg = new JCheckBox("Enable Debug Trace Output");
chkEnbDbg.setBounds(350, 150, 250, 25);
chkEnbDbg.setMnemonic('n');
chkEnbDbg.setSelected(false);
panelsett.add(chkEnbDbg);
Border etched;
etched = BorderFactory.createLoweredBevelBorder();
TitledBorder title;
title = BorderFactory.createTitledBorder(etched, "Server Settings");
title.setTitleJustification(TitledBorder.LEFT);
panelsett.setBorder(title);
topPanel.add(panelsett);
// Create a button
btOk = new JButton( "OK" );
btOk.setBorder(BorderFactory.createRaisedBevelBorder());
btOk.setBounds( 170, 270, 100, 35 );
btOk.setEnabled(false );
topPanel.add(btOk);
btReply = new JButton( "Apply" );
btReply.setBorder(BorderFactory.createRaisedBevelBorder());
btReply.setBounds( 300, 270, 100, 35 );
topPanel.add(btReply);
btCancel = new JButton( "Cancel" );
btCancel.setBorder(BorderFactory.createRaisedBevelBorder());
btCancel.setBounds( 420, 270, 100, 35 );
btCancel.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
System.exit(0);
topPanel.add(btCancel);
// Action for each components
fldServIP.getDocument().addDocumentListener(new DocumentListener()
public void insertUpdate( DocumentEvent event )
String sString = fldServIP.getText();
try
int iValue = Integer.parseInt( sString );
btOk.setEnabled( true );
catch( NumberFormatException e )
if( fldServIP.getText().length() == 4 )
JOptionPane.showMessageDialog(pnlErr,
"Please try again",
"Error Message",
JOptionPane.ERROR_MESSAGE);
public void removeUpdate( DocumentEvent event )
// Prevent the user from entering a blank field
if( fldServIP.getText().length() == 0 )
btOk.setEnabled( false );
else
// Do the same error checking as insertUpdate()
insertUpdate( event );
public void changedUpdate( DocumentEvent event )
// Nothing to do here
fldAuth.getDocument().addDocumentListener(new DocumentListener()
public void insertUpdate( DocumentEvent event )
String sString = fldAuth.getText();
try
int iValue = Integer.parseInt( sString );
btOk.setEnabled( true );
catch( NumberFormatException e )
if( fldAuth.getText().length() == 4 )
JOptionPane.showMessageDialog(pnlErr,
"Please try again",
"Error Message",
JOptionPane.ERROR_MESSAGE);
public void removeUpdate( DocumentEvent event )
// Prevent the user from entering a blank field
if( fldAuth.getText().length() == 0 )
btOk.setEnabled( false );
else
// Do the same error checking as insertUpdate()
insertUpdate( event );
public void changedUpdate( DocumentEvent event )
// Nothing to do here
fldThrd.getDocument().addDocumentListener(new DocumentListener()
public void insertUpdate( DocumentEvent event )
String sString = fldThrd.getText();
try
int iValue = Integer.parseInt( sString );
btOk.setEnabled( true );
catch( NumberFormatException e )
if( fldThrd.getText().length() == 4 )
JOptionPane.showMessageDialog(pnlErr,
"Please try again",
"Error Message",
JOptionPane.ERROR_MESSAGE);
public void removeUpdate( DocumentEvent event )
// Prevent the user from entering a blank field
if( fldThrd.getText().length() == 0 )
btOk.setEnabled( false );
else
// Do the same error checking as insertUpdate()
insertUpdate( event );
public void changedUpdate( DocumentEvent event )
// Nothing to do here
fldAcc.getDocument().addDocumentListener(new DocumentListener()
public void insertUpdate( DocumentEvent event )
String sString = fldAcc.getText();
try
int iValue = Integer.parseInt( sString );
btOk.setEnabled( true );
catch( NumberFormatException e )
if( fldAcc.getText().length() == 4 )
JOptionPane.showMessageDialog(pnlErr,
"Please try again",
"Error Message",
JOptionPane.ERROR_MESSAGE);
public void removeUpdate( DocumentEvent event )
// Prevent the user from entering a blank field
if( fldAcc.getText().length() == 0 )
btOk.setEnabled( false );
else
// Do the same error checking as insertUpdate()
insertUpdate( event );
public void changedUpdate( DocumentEvent event )
// Nothing to do here
fldMax.getDocument().addDocumentListener(new DocumentListener()
public void insertUpdate( DocumentEvent event )
String sString = fldMax.getText();
try
int iValue = Integer.parseInt( sString );
btOk.setEnabled( true );
catch( NumberFormatException e )
if( fldMax.getText().length() == 4 )
JOptionPane.showMessageDialog(pnlErr,
"Please try again",
"Error Message",
JOptionPane.ERROR_MESSAGE);
public void removeUpdate( DocumentEvent event )
// Prevent the user from entering a blank field
if( fldMax.getText().length() == 0 )
btOk.setEnabled( false );
else
// Do the same error checking as insertUpdate()
insertUpdate( event );
public void changedUpdate( DocumentEvent event )
// Nothing to do here
fldAdm.getDocument().addDocumentListener(new DocumentListener()
public void insertUpdate( DocumentEvent event )
String sString = fldAdm.getText();
try
int iValue = Integer.parseInt( sString );
btOk.setEnabled( true );
catch( NumberFormatException e )
if( fldAdm.getText().length() == 4 )
JOptionPane.showMessageDialog(pnlErr,
"Please try again",
"Error Message",
JOptionPane.ERROR_MESSAGE);
public void removeUpdate( DocumentEvent event )
// Prevent the user from entering a blank field
if( fldAdm.getText().length() == 0 )
btOk.setEnabled( false );
else
// Do the same error checking as insertUpdate()
insertUpdate( event );
public void changedUpdate( DocumentEvent event )
// Nothing to do here
fldReplServ.getDocument().addDocumentListener(new DocumentListener()
public void insertUpdate( DocumentEvent event )
String sString = fldReplServ.getText();
try
int iValue = Integer.parseInt( sString );
btOk.setEnabled( true );
catch( NumberFormatException e )
if( fldReplServ.getText().length() == 4 )
JOptionPane.showMessageDialog(pnlErr,
"Please try again",
"Error Message",
JOptionPane.ERROR_MESSAGE);
public void removeUpdate( DocumentEvent event )
// Prevent the user from entering a blank field
if( fldReplServ.getText().length() == 0 )
btOk.setEnabled( false );
else
// Do the same error checking as insertUpdate()
insertUpdate( event );
public void changedUpdate( DocumentEvent event )
// Nothing to do here
public static void main(String[] args)
//int windowWidth, windowHeight;
int windowWidth = 700;
int windowHeight = 400;
PortGUI window = new PortGUI();
window.setTitle("");
Dimension windowSize = window.getSize();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
window.setSize(windowWidth, windowHeight);
window.setLocation((screenSize.width - windowWidth) / 2, (screenSize.height - windowHeight) / 2);
window.setVisible(true);
window.setResizable(false);
On that listing program, my problem is in field document listener, that is:
fldThrd.getDocument().addDocumentListener(new DocumentListener()
public void insertUpdate( DocumentEvent event )
String sString = fldThrd.getText();
try
int iValue = Integer.parseInt( sString );
btOk.setEnabled( true );
catch( NumberFormatException e )
if( fldThrd.getText().length() == 4 )
JOptionPane.showMessageDialog(pnlErr,
"Please try again",
"Error Message",
JOptionPane.ERROR_MESSAGE);
if I execute this program, the textfield can only receive integer input. If input is string til 4 times, the dialog panel will display error message. After that, textfield must be empty (delete automatically).
I want to ask you about how I can emptying that textfield automatically after the dialog panel is appear?
Please help me to get out from my problem.
Thank's for your help,
harHi,
To empty the text file, use the method setText("").
eg. fldServIP.setText("");
fldServIP is one of your textfield. So whereever you are showing the dialog box, use setText("") for the corresponding textfields.
All the best -
SetText() is not working ....please help
hello all,
i am really stuck at something silly in my program, my code is huge to post in here, so i will try to describe as much as i can.
well my problem is i have a class which listen to a socket, when some data has been changed, i want it to modify a JPanel in "another" class, which is the main class of my GUI, by changing the text in that panel.
i am using setText(Sting), but it doesnt work.
i tried to call a method from the listen class to the main and that method have a print statment and setText() call, i checked that the statment is being printed, "which tells me that the listen class is calling that method in the main class, but the text doesnt change.. i tried repaint, revalidate... please help ..
thx for ur time.i am trying to give u the closest picture of my code:
public class SetTextTest extends JPanel{
public JPanel updateHistory;
private JButton updateHistoryButton;
public JLabel updateLabel;
public String updateStatus = "Updates: ";
String updatesList ="";
String updatesIds="", updatesTimes="";
int numOfupdates = 0;
public SetTextTest() {
super(new BorderLayout());
updateHistory = new JPanel();
//Set up Updates History Panel
updateHistory.setLayout(new BoxLayout(updateHistory,BoxLayout.Y_AXIS));//new BorderLayout());
updateHistory.setMaximumSize(new Dimension(300,250));
updateLabel = new JLabel(updateStatus + numOfupdates);
updateHistoryButton = new JButton("Check Updates");
updateHistoryButton.setPreferredSize(new Dimension(120,25));
updateHistoryButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
//open a table
updateHistory.add(updateLabel);
updateHistory.add(updateHistoryButton);
public void newUpdates(){
numOfupdates++;
java.awt.Toolkit.getDefaultToolkit().beep();
System.out.println(updateStatus + numOfupdates);
updateLabel.setText(updateStatus + numOfupdates);
} -
Please help me to avoid this Exception.
I have a JTextField which will accept only non-negative integer. To get the Document roll_doc for the constructor of JTextField
I have a class maxLengthText which will make sure that the JTextfield accepts only non-negative integer.
I have a problem while resetting the content of the JTextField. As I have made sure that only integers are allowed in my text field.
So while using setText(" "). The code executes the exception in my actionListener. I don't want this exceptuion to get executed when I reset the content of my JTextField using setText(String).
Please help. Suggest any workaround for this. Thanks in advance
The code is as follows:
package marksheet;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.BorderFactory;
import javax.swing.*;
import javax.swing.text.*;
public class SpringApplet1 extends JApplet implements ActionListener {
JLabel l_instruction1;
JLabel l_instruction2;
JLabel l_instruction3;
JLabel l_instruction4;
JLabel l_instruction5;
JLabel l_instruction6;
JLabel l_instruction7;
JLabel l_instruction8;
JLabel l_space;
JLabel label1;
JLabel label2;
JLabel label3;
JLabel label4;
JTextField text1;
JTextField text2;
JTextField text3;
JTextField text4;
JLabel l_name;
JLabel l_fname;
JLabel l_course;
JLabel l_specialization;
JLabel l_batch;
JLabel l_semester;
JLabel l_rollno;
JLabel l_enrolno;
JTextField t_name;
JTextField t_fname;
JTextField t_rollno;
JTextField t_enrollno;
JComboBox cb_course;
JComboBox cb_branch;
JComboBox cb_batch;
JComboBox cb_semester;
JCheckBox c_parttime;
JCheckBox c_fulltime;
JButton Submit;
JButton enterMarks;
JButton reset;
JTextField txtInt;
JPanel p;
JPanel p1;
JPanel p2;
JPanel p3;
public void init () {
l_space = new JLabel(" ");
Document roll_doc = new maxLengthText(5); // set maximum length to 5
Document enroll_doc = new maxLengthText(6); // set maximum length to 6
t_rollno= new JTextField(roll_doc, "", 6);
t_enrollno= new JTextField(enroll_doc, "", 7);
Document name_doc = new maxLengthAlpha(15); // set maximum length to 15
t_name = new JTextField(name_doc, "", 7);
l_instruction1 = new JLabel("All names should be alphabets",JLabel.LEFT);
l_instruction1.setForeground(Color.blue);
l_instruction1.setVisible(false);
l_instruction1.setVisible(true);
l_instruction2 = new JLabel("Name can not be greater than 15 characters",JLabel.LEFT);
l_instruction2.setForeground(Color.blue);
l_instruction2.setVisible(false);
l_instruction2.setVisible(true);
l_instruction3 = new JLabel("Seperate firstname and last name with a 'space'",JLabel.LEFT);
l_instruction3.setForeground(Color.blue);
l_instruction3.setVisible(false);
l_instruction3.setVisible(true);
l_instruction4 = new JLabel("All marks are out of 100, Marks obtained are non-negative integers",JLabel.LEFT);
l_instruction4.setForeground(Color.blue);
l_instruction4.setVisible(false);
l_instruction4.setVisible(true);
l_instruction8 = new JLabel("Marks obtained can not be greater than 100 ",JLabel.LEFT);
l_instruction8.setForeground(Color.blue);
l_instruction8.setVisible(false);
l_instruction8.setVisible(true);
l_instruction5 = new JLabel("Roll number should be of length 5 and only numeric",JLabel.LEFT);
l_instruction5.setForeground(Color.blue);
l_instruction5.setVisible(false);
l_instruction5.setVisible(true);
l_instruction6 = new JLabel("Enrolment number should be of length 6 and only numeric",JLabel.LEFT);
l_instruction6.setForeground(Color.blue);
l_instruction6.setVisible(false);
l_instruction6.setVisible(true);
l_instruction7 = new JLabel("All fields are Mandatory",JLabel.LEFT);
l_instruction7.setForeground(Color.blue);
l_instruction7.setVisible(false);
l_instruction7.setVisible(true);
l_name = new JLabel("Name",JLabel.LEFT);
l_name.setForeground(Color.blue);
l_fname = new JLabel("Father's Name",JLabel.LEFT);
l_fname.setForeground(Color.blue);
l_course = new JLabel("Course",JLabel.LEFT);
l_course.setForeground(Color.blue);
l_specialization = new JLabel("Specialization",JLabel.LEFT);
l_specialization.setForeground(Color.blue);
l_batch = new JLabel("Batch",JLabel.LEFT);
l_batch.setForeground(Color.blue);
l_semester = new JLabel("Semester",JLabel.LEFT);
l_semester.setForeground(Color.blue);
l_rollno = new JLabel("Roll Number",JLabel.LEFT);
l_rollno.setForeground(Color.blue);
l_enrolno = new JLabel("Enrolment Number",JLabel.LEFT);
l_enrolno.setForeground(Color.blue);
//t_name = new JTextField(20);
t_name.setEditable(true);
// t_name.setBackground(Color.YELLOW);
t_fname = new JTextField(20);
t_fname.setEditable(true);
// t_fname.setBackground(Color.YELLOW);
//t_rollno = new JTextField(20);
t_rollno.setEditable(true);
// t_rollno.setBackground(Color.YELLOW);
//t_enrollno = new JTextField(20);
t_enrollno.setEditable(true);
// t_enrollno.setBackground(Color.YELLOW);
label1 = new JLabel("Data Structures",JLabel.LEFT);
label1.setForeground(Color.blue);
label1.setVisible(true);
label2 = new JLabel("Compiler Design",JLabel.LEFT);
label2.setForeground(Color.blue);
label2.setVisible(true);
label3 = new JLabel("Numerical Analysis",JLabel.LEFT);
label3.setForeground(Color.blue);
label3.setVisible(true);
label4 = new JLabel("Discrete Matehmatics",JLabel.LEFT);
label4.setForeground(Color.blue);
label4.setVisible(true);
text1 = new JTextField(20);
text1.setEditable(false);
// text1.setBackground(Color.green);
text1.setVisible(true);
text2 = new JTextField(20);
text2.setEditable(false);
// text2.setBackground(Color.green);
text2.setVisible(true);
text3 = new JTextField(20);
text3.setEditable(false);
// text3.setBackground(Color.green);
text3.setVisible(true);
text4 = new JTextField(20);
text4.setEditable(false);
// text4.setBackground(Color.green);
text4.setVisible(true);
String a_course[] =
{" ","BE","MCA"};
String a_branch[] =
{" ","Computer Science","Electronics"};
String a_batch[] =
{" ","2000-2001","2001-2002","2002-2003","2003-2004","2004-2005"};
String a_semester[] =
{" ","I","II","III","IV","V","VI","VII","VIII"};
cb_course = new JComboBox(a_course);
cb_branch = new JComboBox(a_branch);
cb_batch = new JComboBox(a_batch);
cb_semester = new JComboBox(a_semester);
c_parttime = new JCheckBox("Part Time");
c_fulltime = new JCheckBox("Full Time");
Submit = new JButton ("Generate Marksheet");
Submit.setVisible(true);
// Submit.addActionListener(this);
enterMarks = new JButton ("Enter Marks");
enterMarks.setVisible(true);
// enterMarks.addActionListener(this);
reset= new JButton ("Reset");
reset.setVisible(true);
//reset.addActionListener(this);
p = new JPanel(new GridLayout(5,2,2,2));
p.setBorder(BorderFactory.createTitledBorder("Student Details"));
p.add(l_name);
p.add(t_name);
p.add(l_fname);
p.add(t_fname);
p.add(l_rollno);
p.add(t_rollno);
p.add(l_enrolno);
p.add(t_enrollno);
p.add(l_space);
p.add(l_space);
p1 = new JPanel(new GridLayout(0,2,2,2));
p1.setBorder(BorderFactory.createTitledBorder("Course Details"));
p1.add(l_course);
p1.add(cb_course);
p1.add(l_specialization);
p1.add(cb_branch);
p1.add(l_batch);
p1.add(cb_batch);
p1.add(l_semester);
p1.add(cb_semester);
p1.add(c_parttime);
p1.add(c_fulltime);
p1.add(reset);
p1.add(enterMarks);
p2 = new JPanel(new GridLayout(0,2,2,2));
p2.setBorder(BorderFactory.createTitledBorder("Marks Details"));
p2.add(label1);
p2.add(text1);
p2.add(label2);
p2.add(text2);
p2.add(label3);
p2.add(text3);
p2.add(label4);
p2.add(text4);
p2.add(Submit);
p2.setVisible(true);
p3 = new JPanel(new GridLayout(0,1,2,2));
p3.setBorder(BorderFactory.createTitledBorder("Instructions"));
p3.add(l_instruction1);
p3.add(l_instruction2);
p3.add(l_instruction3);
p3.add(l_instruction4);
p3.add(l_instruction8);
p3.add(l_instruction5);
p3.add(l_instruction6);
p3.add(l_instruction7);
JFrame f = new JFrame("Student Marksheet System");
f.getContentPane().setLayout(new GridLayout(2,2,3,3));
f.getContentPane().add(p3);
f.getContentPane().add(p);
f.getContentPane().add(p1);
f.getContentPane().add(p2);
enterMarks.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
String message = "Are you sure all information is correct";
String get_text1;
String title = "Confirmation";
int getcourseindex;
int getbranchindex;
int getsemesterindex;
int getbatchindex;
getcourseindex = cb_course.getSelectedIndex();
getbranchindex = cb_branch.getSelectedIndex();
getsemesterindex = cb_semester.getSelectedIndex();
getbatchindex = cb_branch.getSelectedIndex();
if (c_fulltime.isSelected() == false && c_parttime.isSelected() == false)
JOptionPane.showMessageDialog(null,"Atleast one mandatory field is missing","TextField",1);
return;
if(getcourseindex == 0)
JOptionPane.showMessageDialog(null,"Atleast one mandatory field is missing","TextField",1);
return;
if(getbranchindex == 0)
JOptionPane.showMessageDialog(null,"Atleast one mandatory field is missing","TextField",1);
return;
if(getsemesterindex == 0)
JOptionPane.showMessageDialog(null,"Atleast one mandatory field is missing","TextField",1);
return;
if(getbatchindex == 0)
JOptionPane.showMessageDialog(null,"Atleast one mandatory field is missing","TextField",1);
return;
int n = JOptionPane.showConfirmDialog(null,message,title, JOptionPane.YES_NO_OPTION);
if(n==0)
get_text1 = t_name.getText();
t_name.setEditable(false);
t_fname.setEditable(false);
t_rollno.setEditable(false);
t_enrollno.setEditable(false);
cb_course.setEnabled(false);
cb_branch.setEnabled(false);
cb_batch.setEnabled(false);
cb_semester.setEnabled(false);
reset.setEnabled(false);
reset.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
String message = "Are you sure to reset the fields";
String title = "Confirmation";
int n = JOptionPane.showConfirmDialog(null,message,title, JOptionPane.YES_NO_OPTION);
if(n==0)
Submit.setEnabled(true);
cb_course.setSelectedIndex(0);
cb_branch.setSelectedIndex(0);
cb_batch.setSelectedIndex(0);
cb_semester.setSelectedIndex(0);
t_rollno.setText("");
Submit.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
String message = "Confirmation will generate the marksheet";
String title = "Confirmation";
int n = JOptionPane.showConfirmDialog(null,message,title, JOptionPane.YES_NO_OPTION);
if(n==0)
Submit.setEnabled(true);
c_parttime.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
if (c_fulltime.isSelected() == true)
c_fulltime.setSelected(false);
c_fulltime.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
if (c_parttime.isSelected() == true)
c_parttime.setSelected(false);
f.pack();
f.setVisible(true);
public void paint(Graphics g) {
//Draw a Rectangle around the applet's display area.
g.drawRect(0, 0, size().width - 1, size().height - 1);
public void actionPerformed(ActionEvent event){
package marksheet;
import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
public class maxLengthText extends PlainDocument
int maxVal=0;
public maxLengthText(int maxLength)
maxVal = maxLength;
publ1ic void insertString(int offset, String str, AttributeSet a) throws BadLocationException
if (getLength() + str.length() > maxVal)
return;
else
try
if(!Double.isNaN(Double.parseDouble(str)))
super.insertString(offset, str, a);
catch(Exception e)
JOptionPane.showMessageDialog(null,"Numbers Only","TextField",1);
offset=0;
}When you post code, please use the [co[i]de][co[i]de] tags. There is a code button above the message textfield.
-
hi,
this might sound like a question that shouln't have been asked but
i'm new to java, studied it for a few months (haven't learnt any kind of programming languages before )and been assigned to do a project, tried my best at it but got stuck on this GetString() method
what's wrong with this code
i tried to compile it but came up with errors
cannot find symbol
symbol : method getString()
location: class java.lang.String
stm.setString(4,strdate.getString());
cannot find symbol
symbol : method strtimegetString()
location: class javaproject
stm.setString(5, strtimegetString());
2 errors
here's the code
//javaproject.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.sql.*;
public class javaproject extends JApplet implements ActionListener,Runnable
JPanel panel; JLabel lname, lcode,lterm,ltime,ldate;
JTextField tfname , tfcode;
JButton bttsaved, bttcancel, bttclose;
JComboBox cbterm;
String term[] ={"Semester A","Semester B","Semester C","Semester D"};
String strdate, strtime ;
Thread time;
GregorianCalendar calendar;
public void init()
panel = new JPanel();
lcode = new JLabel ("Code : ");
lname = new JLabel("Name : ");
lterm = new JLabel("Term : ");
ltime = new JLabel();
ldate = new JLabel();
tfcode = new JTextField(20);
tfname = new JTextField(20);
cbterm = new JComboBox(term);
bttsaved = new JButton(" Saved ");
bttcancel = new JButton(" Cancel ");
bttclose = new JButton(" Close ");
calendar = new GregorianCalendar();
time =new Thread(this);
time.start();
display();
panel.add(ldate); panel.add(ltime);
panel.add(lcode); panel.add(tfcode);
panel.add(lname); panel.add(tfname);
panel.add(lterm); panel.add(cbterm);
panel.add(bttsaved); panel.add(bttcancel); panel.add(bttclose);
getContentPane().add(panel);
bttsaved.addActionListener(this);
bttcancel.addActionListener(this);
bttclose.addActionListener(this);
public void run()
for(;;)
calendar = new GregorianCalendar();
strtime = calendar.get(Calendar.HOUR)+":"+calendar.get(Calendar.MINUTE)
+":"+calendar.get(Calendar.SECOND);
ltime.setText(strtime);
try
time.sleep(1000);
catch(InterruptedException e)
showStatus("ThreadInterrupted");
public void display()
strdate = calendar.get(Calendar.DATE) + "/" + (calendar.get(Calendar.MONTH)+1) + "/"+calendar.get(Calendar.YEAR);
ldate.setText(strdate);
public void actionPerformed(ActionEvent evt)
if(evt.getSource() == bttcancel )
tfcode.setText(" ");
tfname.setText(" ");
showStatus(" ..... Please enter new information ..... ");
if(evt.getSource() == bttclose )
System.exit(0);
if(evt.getSource() ==bttsaved )
try
String blankcode = tfcode.getText();
if(blankcode.length() == 0)
showStatus("Student's code cannot be empty");
return;
String blankname = tfname.getText();
if(blankname.length() == 0)
showStatus("..... Student's name cannot be empty ......");
return;
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con;
con = DriverManager.getConnection("jdbc:odbc:kayteej","sa", null);
PreparedStatement stm;
stm = con.prepareStatement("insert into Students values(?,?,?)");
stm.setString(1,tfcode.getText());
stm.setString(2,tfname.getText());
stm.setString(3,(String)cbterm.getSelectedItem());
stm.setString(4,strdate.getString());
stm.setString(5, strtimegetString());
stm.executeUpdate();
showStatus("..... Please enter new information ..... ");
JOptionPane.showMessageDialog(null, "Data Saved","Congrats!!",1);
catch(Exception err)
showStatus("Error occured while interacting with sql");
//<Applet code="javaproject.class" width=800 height=600></applet>
should i use the getString method or is it possible to use other type of methods. please help I'm really stuck
Thank you in advanceSo when you run it, the code throws an exception? Then there's something wrong with your code, or with your setup.
The exception's stack trace contains useful information which would help you (or us) figure out just what is wrong. Hopefully you have a catch-block that calls the printStackTrace() method of the exception. -
Problem in socket communication please help me!
server
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
class SocketServer extends JFrame
implements ActionListener {
JLabel text1, text2;
JButton button1, button2;
JPanel panel;
JTextField textField1, textField2;
ServerSocket server = null;
Socket socket = null;
BufferedReader in1 = null;
PrintWriter out1 = null;
String line1;
String line2;
SocketServer(){ //Begin Constructor
text1 = new JLabel("Send Information:");
text2 = new JLabel("Receive Information:");
textField1 = new JTextField(20);
textField2 = new JTextField(20);
button1 = new JButton("Send");
button2 = new JButton("Receive");
button1.addActionListener(this);
button2.addActionListener(this);
panel = new JPanel();
panel.setLayout(new GridLayout(2,3));
panel.setBackground(Color.lightGray);
getContentPane().add(panel);
panel.add(text1);
panel.add(textField1);
panel.add(button1);
panel.add(text2);
panel.add(textField2);
panel.add(button2);
setSize(500,100);
} //End Constructor
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
if(source == button1){
//Send data over socket
String text = textField1.getText();
out1.println(text);
textField1.setText(new String(""));
//Receive text from server
try{
String line1 = in1.readLine();
System.out.println("Text received :" + line1);
} catch (IOException e){
System.out.println("Read failed");
System.exit(1);
if(source == button2){
textField2.setText(line2);
public void listenSocket(){
try{
server = new ServerSocket(4444);
} catch (IOException e) {
System.out.println("Could not listen on port 4444");
System.exit(-1);
try{
socket = server.accept();
} catch (IOException e) {
System.out.println("Accept failed: 4444");
System.exit(-1);
try{
in1 = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out1 = new PrintWriter(socket.getOutputStream(), true);
} catch (IOException e) {
System.out.println("Accept failed: 4444");
System.exit(-1);
while(true){
try{
line2 = in1.readLine();
//Send data back to client
out1.println(line2);
} catch (IOException e) {
System.out.println("Read failed");
System.exit(-1);
protected void finalize(){
//Clean up
try{
in1.close();
out1.close();
server.close();
} catch (IOException e) {
System.out.println("Could not close.");
System.exit(-1);
public static void main(String[] args){
SocketServer frame = new SocketServer();
frame.setTitle("Chat (Server)");
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
frame.addWindowListener(l);
frame.pack();
frame.setVisible(true);
frame.listenSocket();
client
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
class SocketClient extends JFrame
implements ActionListener {
JLabel text1, text2;
JButton button1, button2;
JPanel panel;
JTextField textField1, textField2;
Socket socket = null;
PrintWriter out = null;
BufferedReader in = null;
String line3;
String line4;
SocketClient(){ //Begin Constructor
text1 = new JLabel("Send Information:");
text2 = new JLabel("Receive Information:");
textField1 = new JTextField(20);
textField2 = new JTextField(20);
button1 = new JButton("Send");
button2 = new JButton("Receive");
button1.addActionListener(this);
button2.addActionListener(this);
panel = new JPanel();
panel.setLayout(new GridLayout(2,3));
panel.setBackground(Color.lightGray);
getContentPane().add(panel);
panel.add(text1);
panel.add(textField1);
panel.add(button1);
panel.add(text2);
panel.add(textField2);
panel.add(button2);
setSize(500,100);
} //End Constructor
public void actionPerformed(ActionEvent event){
Object source = event.getSource();
if(source == button1){
//Send data over socket
String text = textField1.getText();
out.println(text);
textField1.setText(new String(""));
//Receive text from server
try{
String line3 = in.readLine();
System.out.println("Text received :" + line3);
} catch (IOException e){
System.out.println("Read failed");
System.exit(1);
if(source == button2){
textField2.setText(line4);
public void listenSocket(){
//Create socket connection
try{
socket = new Socket("Localhost", 4444);
out = new PrintWriter(socket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
} catch (UnknownHostException e) {
System.out.println("Unknown host: Localhost");
System.exit(1);
} catch (IOException e) {
System.out.println("No I/O");
System.exit(1);
while(true){
try{
line4 = in.readLine();
//Send data back to client
out.println(line4);
} catch (IOException e) {
System.out.println("Read failed");
System.exit(-1);
public static void main(String[] args){
SocketClient frame = new SocketClient();
frame.setTitle("Chat (Client)");
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
frame.addWindowListener(l);
frame.pack();
frame.setVisible(true);
frame.listenSocket();
There were problems when executing the application
please help mei had no problem running this... make sure you open the server part first and have that sitting and waiting for the client to connect.... then it should work.
Would you believe that i too am working on the server / socket thing... however my problem is getting the server to read from a database and report back to the client.... -
Scroll bar problems ..Please help!!!!!!
This is what the program looks like. topPanel has newItemPanel on top of it. when you click continue newItemPanel becomes invisible and newItemDescriptionPanel becomes visible. When you click continue newItemDescriptionPanel becomes invisible and priceEnterPanel becomes visible.
I want newItemDescriptionPanel and priceEnterPanel to have a scroll bar. but everything I have tried hasn't worked. I am new. You will see the code is ugly and there is an attempt to add a scrollbar.
Please help
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.border.*;
import java.lang.System;
public class MainPanel extends JFrame implements ActionListener
private boolean firstRun = true;
private final int ITEM_PLAIN = 0; // Item types
private final int ITEM_CHECK = 1;
private final int ITEM_RADIO = 2;
private JPanel topPanel;
private JPanel newItemPanel;
private JRadioButton onlineAuctionRadio;
private JRadioButton fixedPriceRadio;
private ButtonGroup bg;
private JButton continueButton;
private JLabel blankLabel; //used to give space between things
private JPanel newItemDescriptionPanel;
private JPanel takeAdditionalSpacePanelCheckBox;
private JPanel takeAdditionalSpacePanel;
private JPanel takeAdditionalSpacePanelLabel;
private JPanel takeAdditionalSpacePanelLabel2;
private JPanel takeAdditionalSpacePanel2;
private JPanel takeAdditionalSpacePanel3;
private JPanel takeAdditionalSpacePanel4;
private JPanel takeAdditionalSpacePanel5;
JScrollPane displayScroller;
JEditorPane itemDescriptionTextArea;
GridBagLayout gridbag;
GridBagConstraints gbc;
private JCheckBox secondCategoryCheckBox;
private JLabel itemTitleLabel;
private JLabel requiredLabel, requiredLabel2;
private JLabel requiredStarLabel;
private JTextField itemTitleTextField;
private JLabel subtitleLabel;
private JTextField subtitleTextField;
private JLabel itemDescriptionLabel;
private JButton itemDescriptionContinueButton;
private JLabel percentageLabel;
//------- price enter page ----------------
private JLabel startingPriceLabel;
private JLabel dollarSignLabel;
private JTextField startingPriceTextField;
private JPanel fillUpSpacePanel;
private JPanel fillUpSpacePanel1;
private JPanel fillUpSpacePanel2;
private JLabel buyItNowLabel;
private JPanel fillUpSpacePanel3;
private JLabel dollarSignLabel2;
private JTextField buyItNowTextField;
private JPanel fillUpSpacePanel4;
private JPanel fillUpSpacePanel5;
private JPanel fillUpSpacePanel6;
private JPanel fillUpSpacePanel7;
private JPanel fillUpSpacePanel8;
private JPanel fillUpSpacePanel9;
private JPanel fillUpSpacePanel10;
private JPanel fillUpSpacePanel11;
private JPanel fillUpSpacePanel12;
private JPanel fillUpSpacePanel13;
private JPanel fillUpSpacePanel14;
private JPanel fillUpSpacePanel15;
private JPanel fillUpSpacePanel16;
private JPanel fillUpSpacePanel17;
private JPanel fillUpSpacePanel18;
private JLabel donatePercentageLabel;
private JTextField donatePercentageTextField;
private JPanel fSp; // fill space panel
private JPanel fSp1;
private JPanel fSp2;
private JPanel fSp3;
private JPanel fSp4;
private JPanel fSp5;
private JPanel fSp6;
private JPanel fSp7;
private JPanel fSp8;
private JPanel fSp9;
private JLabel numberOfPicturesLabel;
private JTextField numberOfPicturesTextField;
private JCheckBox superSizePicturesCheckBox;
private JLabel superSizePicturesLabel;
private JRadioButton standardPictureRadioButton;
private JRadioButton picturePackRadioButton;
private JCheckBox listingDesignerCheckBox;
private ButtonGroup bgPictures;
private JCheckBox valuePackCheckBox;
private JCheckBox galleryPictureCheckBox;
private JCheckBox subtitleCheckBox;
private JCheckBox boldCheckBox;
private JCheckBox borderCheckBox;
private JCheckBox highlightCheckBox;
private JCheckBox featuredPlusCheckBox;
private JCheckBox galleryFeaturedCheckBox;
private JLabel homePageFeaturedLabel;
private JComboBox homePageFeaturedComboBox;
private JCheckBox giftCheckBox;
JScrollPane priceEnterPanelScroll;
private JButton backToRadioButton;
private JButton backToItemDescriptionButton;
private JPanel priceEnterPanel;
private final static String RADIOPANEL = "JPanel with radios";
private final static String DESCRIPTIONPANEL = "JPanel with description";
private final static String PRICEENTERPANEL = "JPanel with price entering";
private JPanel cards;
private JMenuBar menuBar;
private JMenu menuFile;
private JMenu menuEdit;
private JMenu menuProperty;
private JMenuItem menuPropertySystem;
private JMenuItem menuPropertyEditor;
private JMenuItem menuPropertyDisplay;
private JMenu menuFileNew;
private JMenuItem menuFileNewAccount;
private JMenuItem menuFileNewItem;
private JMenuItem menuFileOpen;
private JMenuItem menuFileSave;
private JMenuItem menuFileSaveAs;
private JMenuItem menuFileExit;
private JMenuItem menuEditCopy;
private JMenuItem menuEditCut;
private JMenuItem menuEditPaste;
public MainPanel()
requiredLabel = new JLabel ("* Required");
requiredLabel.setForeground (Color.red);
requiredLabel2 = new JLabel ("* Required");
requiredLabel2.setForeground (Color.red);
requiredStarLabel = new JLabel ("*");
requiredStarLabel.setForeground (Color.green);
setTitle( "photo galleries" );
setSize( 310, 130 );
topPanel = new JPanel();
topPanel.setLayout( new BorderLayout() );
topPanel.setBorder (BorderFactory.createTitledBorder ("TopPanel"));
//topPanel.setPreferredSize(new Dimension (300,300));
getContentPane().add( topPanel );
topPanel.setVisible (false);
// For New Item Panel
ButtonListener ears = new ButtonListener();
blankLabel = new JLabel (" "); // used to give space between radio buttons and continue button
continueButton = new JButton ("Continue >");
continueButton.addActionListener (ears);
backToRadioButton = new JButton ("< back");
backToRadioButton.addActionListener (ears);
itemDescriptionContinueButton = new JButton ("Continue >");
itemDescriptionContinueButton.addActionListener (ears);
backToItemDescriptionButton = new JButton ("< back");
backToItemDescriptionButton.addActionListener (ears);
newItemPanel = new JPanel();
newItemPanel.setLayout (new BoxLayout(newItemPanel, BoxLayout.Y_AXIS));
//topPanel.add (newItemPanel, BorderLayout.NORTH);
newItemPanel.setBorder (BorderFactory.createTitledBorder ("NewItemPanel"));
newItemPanel.setVisible (false);
onlineAuctionRadio = new JRadioButton ("Sold item at online Auction" );
fixedPriceRadio = new JRadioButton ("Sold at a Fixed Price");
bg = new ButtonGroup();
bg.add(onlineAuctionRadio);
bg.add(fixedPriceRadio);
onlineAuctionRadio.addActionListener (ears);
fixedPriceRadio.addActionListener (ears);
newItemPanel.add (onlineAuctionRadio);
newItemPanel.add (fixedPriceRadio);
newItemPanel.add (blankLabel);
newItemPanel.add (continueButton);
// ------ After continue pressed ---------
newItemDescriptionPanel = new JPanel();
newItemDescriptionPanel.setLayout (new BoxLayout(newItemDescriptionPanel, BoxLayout.Y_AXIS));
newItemPanel.add (newItemDescriptionPanel, BorderLayout.NORTH);
newItemDescriptionPanel.setBorder (BorderFactory.createTitledBorder ("newItemDescriptionPanel"));
secondCategoryCheckBox = new JCheckBox ("The item was listed in a second category");
newItemDescriptionPanel.setVisible (false);
itemTitleLabel = new JLabel ("Item title");
itemTitleTextField = new JTextField (30);
subtitleLabel = new JLabel ("Subtitle ($0.50)");
subtitleTextField = new JTextField (30);
itemDescriptionLabel = new JLabel ("Item description");
itemDescriptionTextArea = new JEditorPane();
itemDescriptionTextArea.setContentType( "text/html" );
itemDescriptionTextArea.setEditable( false );
itemDescriptionTextArea.setPreferredSize(new Dimension (500,250));
itemDescriptionTextArea.setFont(new Font( "Serif", Font.PLAIN, 12 ));
itemDescriptionTextArea.setForeground( Color.black );
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 4;
displayScroller = new JScrollPane( itemDescriptionTextArea );
gridbag = new GridBagLayout ();
gridbag.setConstraints( displayScroller, gbc );
itemDescriptionTextArea.setEditable( true );
takeAdditionalSpacePanelCheckBox = new JPanel(new FlowLayout(FlowLayout.LEFT));
takeAdditionalSpacePanel = new JPanel(new FlowLayout(FlowLayout.LEFT));//<--added, to take additional space
takeAdditionalSpacePanelLabel = new JPanel(new FlowLayout(FlowLayout.LEFT));//<--added, to take additional space
takeAdditionalSpacePanelLabel2 = new JPanel(new FlowLayout(FlowLayout.LEFT));//<--added, to take additional space
takeAdditionalSpacePanel2 = new JPanel(new FlowLayout(FlowLayout.LEFT));//<--added, to take additional space
takeAdditionalSpacePanel3 = new JPanel(new FlowLayout(FlowLayout.LEFT));//<--added, to take additional space
takeAdditionalSpacePanel4 = new JPanel(new FlowLayout(FlowLayout.LEFT));
takeAdditionalSpacePanel5 = new JPanel(new FlowLayout(FlowLayout.LEFT));
//takeAdditionalSpacePanel2.setBorder (BorderFactory.createTitledBorder ("Additonal 2"));
takeAdditionalSpacePanelCheckBox.add (secondCategoryCheckBox);
newItemDescriptionPanel.add (takeAdditionalSpacePanelCheckBox);
//newItemDescriptionPanel.add (blankLabel);
takeAdditionalSpacePanelLabel.add (itemTitleLabel);
takeAdditionalSpacePanelLabel.add (requiredLabel);
newItemDescriptionPanel.add (takeAdditionalSpacePanelLabel);
//newItemDescriptionPanel.add (itemTitleTextField);
takeAdditionalSpacePanel.add(itemTitleTextField);//<--add textfield to panel
newItemDescriptionPanel.add (takeAdditionalSpacePanel);//<--add panel to boxlayout panel
takeAdditionalSpacePanelLabel2.add (subtitleLabel);
newItemDescriptionPanel.add (takeAdditionalSpacePanelLabel2);
takeAdditionalSpacePanel2.add (subtitleTextField);
newItemDescriptionPanel.add (takeAdditionalSpacePanel2);
takeAdditionalSpacePanel4.add (itemDescriptionLabel);
//takeAdditionalSpacePanel4.add (requiredLabel2);
newItemDescriptionPanel.add (takeAdditionalSpacePanel4);
takeAdditionalSpacePanel3.add (displayScroller);
newItemDescriptionPanel.add (takeAdditionalSpacePanel3);
takeAdditionalSpacePanel5.add (backToRadioButton);
takeAdditionalSpacePanel5.add (itemDescriptionContinueButton);
newItemDescriptionPanel.add (takeAdditionalSpacePanel5);
//newItemDescriptionPanel.setLayout (new BoxLayout(newItemDescriptionPanel, BoxLayout.Y_AXIS));
//----------- Price Enter Page ----------------
priceEnterPanel = new JPanel();
priceEnterPanel.setLayout (new BoxLayout(priceEnterPanel, BoxLayout.Y_AXIS));
newItemDescriptionPanel.add (priceEnterPanel, BorderLayout.NORTH);
priceEnterPanel.setBorder (BorderFactory.createTitledBorder ("Price enter Panel"));
priceEnterPanel.setVisible (false);
priceEnterPanelScroll = new JScrollPane (priceEnterPanel);
topPanel.add (priceEnterPanelScroll);
standardPictureRadioButton = new JRadioButton ("Standard");
picturePackRadioButton = new JRadioButton ("Picture Pack ($1.00 for up to 6 pictures or $1.50 for 7 to 12 pictures)");
bgPictures = new ButtonGroup();
bgPictures.add(standardPictureRadioButton);
bgPictures.add(picturePackRadioButton);
standardPictureRadioButton.addActionListener (ears);
picturePackRadioButton.addActionListener (ears);
superSizePicturesCheckBox = new JCheckBox ("Supersize Pictures ($0.75)");
listingDesignerCheckBox = new JCheckBox ("Listing designer $0.10");
valuePackCheckBox = new JCheckBox ("Get the Essentials for less! Gallery, Subtitle, Listing Designer. $0.65 (save $0.30)");
superSizePicturesCheckBox.setEnabled (false);
superSizePicturesCheckBox.addActionListener (ears);
listingDesignerCheckBox.addActionListener (ears);
valuePackCheckBox.addActionListener (ears);
startingPriceLabel = new JLabel ("Starting Price");
dollarSignLabel = new JLabel ("$");
startingPriceTextField = new JTextField (10);
buyItNowLabel = new JLabel ("Buy It Now");
dollarSignLabel2 = new JLabel ("$");
buyItNowTextField = new JTextField (10);
donatePercentageLabel = new JLabel ("Donate percentage of sale");
donatePercentageTextField = new JTextField (2);
donatePercentageTextField.setText ("0");
percentageLabel = new JLabel ("%");
// Right-justify the text
donatePercentageTextField.setHorizontalAlignment(JTextField.RIGHT);
numberOfPicturesLabel = new JLabel ("Number of pictures used");
numberOfPicturesTextField = new JTextField (1);
numberOfPicturesTextField.setText ("0");
galleryPictureCheckBox = new JCheckBox ("Gallery ($0.35) [Requires a picture]");
subtitleCheckBox = new JCheckBox ("Subtitle ($0.50)");
boldCheckBox = new JCheckBox ("Bold ($1.00)");
borderCheckBox = new JCheckBox ("Border ($3.00)");
highlightCheckBox = new JCheckBox ("Highlight ($5.00)");
featuredPlusCheckBox = new JCheckBox ("Featured Plus! ($19.95)");
galleryFeaturedCheckBox = new JCheckBox ("Gallery Featured ($19.95) [Requires a picture]");
homePageFeaturedLabel = new JLabel ("Home Page Featured ($39.95 for 1 item, $79.95 for 2 or more items)");
homePageFeaturedComboBox = new JComboBox ();
homePageFeaturedComboBox.addItem (("None..."));
homePageFeaturedComboBox.addItem (("1 item"));
homePageFeaturedComboBox.addItem (("2 or more items"));
giftCheckBox = new JCheckBox ("Show as a gift ($0.25)");
fillUpSpacePanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel1 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel2 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel3 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel4 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel5 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel6 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel7 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel8 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel9 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel10 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel11 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel12 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel13 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel14 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel15 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel16 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel17 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel18 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fSp = new JPanel(new FlowLayout(FlowLayout.LEFT));
fSp1 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fSp2 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fSp3 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fSp4 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fSp5 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fSp6 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fSp7 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fSp8 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fSp9 = new JPanel(new FlowLayout(FlowLayout.LEFT));
fillUpSpacePanel.add (startingPriceLabel);
fillUpSpacePanel.add (requiredLabel2);
priceEnterPanel.add (fillUpSpacePanel);
fillUpSpacePanel2.add (dollarSignLabel);
fillUpSpacePanel2.add (startingPriceTextField);
priceEnterPanel.add (fillUpSpacePanel2);
// fillUpSpacePanel1.add (backToItemDescriptionButton);
// priceEnterPanel.add (fillUpSpacePanel1);
fillUpSpacePanel3.add (buyItNowLabel);
priceEnterPanel.add (fillUpSpacePanel3);
fillUpSpacePanel4.add (dollarSignLabel2);
fillUpSpacePanel4.add (buyItNowTextField);
priceEnterPanel.add (fillUpSpacePanel4);
fillUpSpacePanel1.add (donatePercentageLabel);
priceEnterPanel.add (fillUpSpacePanel1);
fillUpSpacePanel5.add (donatePercentageTextField);
fillUpSpacePanel5.add (percentageLabel);
priceEnterPanel.add (fillUpSpacePanel5);
fillUpSpacePanel6.add (numberOfPicturesLabel);
priceEnterPanel.add (fillUpSpacePanel6);
fillUpSpacePanel7.add (numberOfPicturesTextField);
priceEnterPanel.add (fillUpSpacePanel7);
fillUpSpacePanel8.add (standardPictureRadioButton);
priceEnterPanel.add (fillUpSpacePanel8);
fillUpSpacePanel10.add (blankLabel);
fillUpSpacePanel10.add (superSizePicturesCheckBox);
priceEnterPanel.add (fillUpSpacePanel10);
fillUpSpacePanel9.add (picturePackRadioButton);
priceEnterPanel.add (fillUpSpacePanel10);
fillUpSpacePanel11.add (picturePackRadioButton);
priceEnterPanel.add (fillUpSpacePanel11);
fillUpSpacePanel12.add (listingDesignerCheckBox);
priceEnterPanel.add (fillUpSpacePanel12);
fillUpSpacePanel13.add (valuePackCheckBox);
priceEnterPanel.add (fillUpSpacePanel13);
fSp.add (galleryPictureCheckBox);
priceEnterPanel.add (fSp);
fSp1.add (subtitleCheckBox);
priceEnterPanel.add (fSp1);
fSp2.add (boldCheckBox);
priceEnterPanel.add (fSp2);
fSp3.add (borderCheckBox);
priceEnterPanel.add (fSp3);
fSp4.add (highlightCheckBox);
priceEnterPanel.add (fSp4);
fSp5.add (featuredPlusCheckBox);
priceEnterPanel.add (fSp5);
fSp6.add (galleryFeaturedCheckBox);
priceEnterPanel.add (fSp6);
fSp7.add (homePageFeaturedLabel);
priceEnterPanel.add (fSp7);
fSp8.add (homePageFeaturedComboBox);
priceEnterPanel.add (fSp8);
fSp9.add (giftCheckBox);
priceEnterPanel.add (fSp9);
newItemDescriptionPanel.add (priceEnterPanelScroll);
//Create the panel that contains the "cards".
cards = new JPanel(new CardLayout());
cards.add(newItemPanel, RADIOPANEL);
cards.add(newItemDescriptionPanel, DESCRIPTIONPANEL);
cards.add(priceEnterPanel, PRICEENTERPANEL);
topPanel.add(cards, BorderLayout.NORTH);
// Create the menu bar
menuBar = new JMenuBar();
// Set this instance as the application's menu bar
setJMenuBar( menuBar );
// Build the property sub-menu
menuProperty = new JMenu( "Properties" );
menuProperty.setMnemonic( 'P' );
// Create property items
menuPropertySystem = CreateMenuItem( menuProperty, ITEM_PLAIN,
"System...", null, 'S', null );
menuPropertyEditor = CreateMenuItem( menuProperty, ITEM_PLAIN,
"Editor...", null, 'E', null );
menuPropertyDisplay = CreateMenuItem( menuProperty, ITEM_PLAIN,
"Display...", null, 'D', null );
//Build the File-New sub-menu
menuFileNew = new JMenu ("New");
menuFileNew.setMnemonic ('N');
//Create File-New items
menuFileNewItem = CreateMenuItem( menuFileNew, ITEM_PLAIN,
"Item", null, 'A', null );
menuFileNewAccount = CreateMenuItem( menuFileNew, ITEM_PLAIN,
"Account", null, 'A', null );
// Create the file menu
menuFile = new JMenu( "File" );
menuFile.setMnemonic( 'F' );
menuBar.add( menuFile );
//Add the File-New menu
menuFile.add( menuFileNew );
// Create the file menu
// Build a file menu items
menuFileOpen = CreateMenuItem( menuFile, ITEM_PLAIN, "Open...",
new ImageIcon( "open.gif" ), 'O',
"Open a new file" );
menuFileSave = CreateMenuItem( menuFile, ITEM_PLAIN, "Save",
new ImageIcon( "save.gif" ), 'S',
" Save this file" );
menuFileSaveAs = CreateMenuItem( menuFile, ITEM_PLAIN,
"Save As...", null, 'A',
"Save this data to a new file" );
// Add the property menu
menuFile.addSeparator();
menuFile.add( menuProperty );
menuFile.addSeparator();
menuFileExit = CreateMenuItem( menuFile, ITEM_PLAIN,
"Exit", null, 'X',
"Exit the program" );
//menuFileExit.addActionListener(this);
// Create the file menu
menuEdit = new JMenu( "Edit" );
menuEdit.setMnemonic( 'E' );
menuBar.add( menuEdit );
// Create edit menu options
menuEditCut = CreateMenuItem( menuEdit, ITEM_PLAIN,
"Cut", null, 'T',
"Cut data to the clipboard" );
menuEditCopy = CreateMenuItem( menuEdit, ITEM_PLAIN,
"Copy", null, 'C',
"Copy data to the clipboard" );
menuEditPaste = CreateMenuItem( menuEdit, ITEM_PLAIN,
"Paste", null, 'P',
"Paste data from the clipboard" );
public JMenuItem CreateMenuItem( JMenu menu, int iType, String sText,
ImageIcon image, int acceleratorKey,
String sToolTip )
// Create the item
JMenuItem menuItem;
switch( iType )
case ITEM_RADIO:
menuItem = new JRadioButtonMenuItem();
break;
case ITEM_CHECK:
menuItem = new JCheckBoxMenuItem();
break;
default:
menuItem = new JMenuItem();
break;
// Add the item test
menuItem.setText( sText );
// Add the optional icon
if( image != null )
menuItem.setIcon( image );
// Add the accelerator key
if( acceleratorKey > 0 )
menuItem.setMnemonic( acceleratorKey );
// Add the optional tool tip text
if( sToolTip != null )
menuItem.setToolTipText( sToolTip );
// Add an action handler to this menu item
menuItem.addActionListener( this );
menu.add( menuItem );
return menuItem;
public void actionPerformed( ActionEvent event )
CardLayout cl = (CardLayout)(cards.getLayout());
if (event.getSource() == menuFileExit)
System.exit(0);
if (event.getSource() == menuFileNewAccount)
System.out.println ("hlkadflkajfalkdjfalksfj");
if (event.getSource() == menuFileNewItem){
if (firstRun){
newItemPanel.setVisible (true);
topPanel.setVisible (true);
cl.show(cards,RADIOPANEL);
firstRun = false;
//System.out.println( event );
private class ButtonListener implements ActionListener
public void actionPerformed(ActionEvent event)
CardLayout cl = (CardLayout)(cards.getLayout());
// cl.show(cards, (String)evt.getItem());
if (event.getSource() == continueButton){
if (!(onlineAuctionRadio.isSelected()) && !(fixedPriceRadio.isSelected()))
JOptionPane.showMessageDialog(null, "You must select at least one.", "Error", JOptionPane.ERROR_MESSAGE);
else{
if (onlineAuctionRadio.isSelected()){
cl.show (cards, DESCRIPTIONPANEL);
//newItemPanel.setVisible (false);
//newItemDescriptionPanel.setVisible (true);
if (event.getSource() == itemDescriptionContinueButton){
if (itemTitleTextField.getText().trim().equalsIgnoreCase(""))
JOptionPane.showMessageDialog(null, "You must enter a title.", "Error", JOptionPane.ERROR_MESSAGE);
else
cl.show (cards, PRICEENTERPANEL);
if (event.getSource() == backToRadioButton){
cl.show (cards, RADIOPANEL);
if (event.getSource() == backToItemDescriptionButton){
cl.show(cards, DESCRIPTIONPANEL);
if (standardPictureRadioButton.isSelected()){
superSizePicturesCheckBox.setEnabled (true);
if (picturePackRadioButton.isSelected()){
superSizePicturesCheckBox.setEnabled (false);
} //end of action performed
}Mostly I see there is about 100 times as much code as I care to look at.
So you don't know how to get a panel in a scroll pane, and then get that scroll pane into your GUI? Then try doing that by itself, not encumbered with 10000 lines of irrelevant code. Once you have it working, plug it into the big lump of code. Or if you can't get it working, ask about the small problem here. -
Please Help - Need Help with Buttons for GUI for assignment. URGENT!!
Can someone please help me with the buttons on this program? I cannot figure out how to get them to work.
Thanks!!!
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.JButton;
public class InventoryTAH implements ActionListener
Maker[] proMaker;
JTextField[] fields;
NumberFormat nf;
public void actionPerformed(ActionEvent e)
int index = ((JComboBox)e.getSource()).getSelectedIndex();
populateFields(index);
public static void main(String[] args)
try
UIManager.setLookAndFeel(
"com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
catch (Exception e)
System.err.println(e.getClass().getName() + ": " + e.getMessage());
InventoryTAH test = new InventoryTAH();
test.initMakers();
test.showGUI();
test.populateFields(0);
private void initMakers() {
proMaker = new Maker[10];
proMaker[0] = new Maker( 1, "Pens",1.59,100,"Bic");
proMaker[1] = new Maker( 2, "Pencils", .65, 100,"Mead");
proMaker[2] = new Maker( 3, "Markers", 1.29, 100,"Sharpie");
proMaker[3] = new Maker( 4, "Paperclips", 1.19, 100,"Staples");
proMaker[4] = new Maker( 5, "Glue", .85, 100,"Elmer's");
proMaker[5] = new Maker( 6, "Tape", .50, 100,"3m");
proMaker[6] = new Maker( 7, "Paper", 1.85, 100,"Mead");
proMaker[7] = new Maker( 8, "Stapler", 2.21, 100,"Swingline");
proMaker[8] = new Maker( 9, "Folders", .50, 100,"Mead");
proMaker[9] = new Maker( 10, "Rulers", .27, 100,"Stanley");
int maxNum = 10;
int currentNum = 0;
int currentInv = 0;
Action firstAction = new AbstractAction("First")
public void actionPerformed(ActionEvent evt)
currentInv = 0;
int populateFields;
JButton firstButton = new JButton(firstAction);
Action previousAction = new AbstractAction("Previous")
public void actionPerformed(ActionEvent evt)
currentInv--;
if (currentInv < 0)
currentInv = maxNum - 1;
int populateFields;
JButton previousButton = new JButton(previousAction);
Action nextAction = new AbstractAction("Next")
public void actionPerformed(ActionEvent evt)
currentInv++;
if (currentInv >= currentNum)
currentInv = 0;
int populateFields;
JButton nextButton = new JButton(nextAction);
Action lastAction = new AbstractAction("Last")
public void actionPerformed(ActionEvent evt)
currentInv = currentNum - 1;
int populateFields;
JButton lastButton = new JButton(lastAction);
JPanel buttonPanel = new JPanel( );
private void showGUI() {
JLabel l;
JButton button1;
JButton button2;
fields = new JTextField[8];
JFrame f = new JFrame("Inventory");
Container cp = f.getContentPane();
cp.setLayout(new GridBagLayout());
cp.setBackground(UIManager.getColor(Color.BLACK));
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = GridBagConstraints.RELATIVE;
c.gridwidth = 1;
c.gridheight = 1;
c.insets = new Insets(2, 2, 2, 2);
c.anchor = GridBagConstraints.EAST;
cp.add(l = new JLabel("Item Number:", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('a');
cp.add(l = new JLabel("Item Name:", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('b');
cp.add(l = new JLabel("Number of Units in Stock:", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('c');
cp.add(l = new JLabel("Price per Unit: $", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('d');
cp.add(l = new JLabel("Total cost of Item: $", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('e');
cp.add(l = new JLabel("Total Value of Merchandise in Inventory: $", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('f');
cp.add(l = new JLabel("Manufacturer:", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('g');
cp.add(l = new JLabel("Restocking Fee: $", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('h');
c.gridx = 1;
c.gridy = 0;
c.weightx = 1.0;
c.fill = GridBagConstraints.HORIZONTAL;
c.anchor = GridBagConstraints.CENTER;
cp.add(fields[0] = new JTextField(), c);
fields[0].setFocusAccelerator('a');
c.gridx = 1;
c.gridy = GridBagConstraints.RELATIVE;
cp.add(fields[1] = new JTextField(), c);
fields[1].setFocusAccelerator('b');
cp.add(fields[2] = new JTextField(), c);
fields[2].setFocusAccelerator('c');
cp.add(fields[3] = new JTextField(), c);
fields[3].setFocusAccelerator('d');
cp.add(fields[4] = new JTextField(), c);
fields[4].setFocusAccelerator('e');
cp.add(fields[5] = new JTextField(), c);
fields[5].setFocusAccelerator('f');
cp.add(fields[6] = new JTextField(), c);
fields[6].setFocusAccelerator('g');
cp.add(fields[7] = new JTextField(), c);
fields[7].setFocusAccelerator('h');
c.weightx = 0.0;
c.fill = GridBagConstraints.NONE;
cp.add(firstButton);
cp.add(previousButton);
cp.add(nextButton);
cp.add(lastButton);
JComboBox combo = new JComboBox();
for(int j = 0; j < proMaker.length; j++)
combo.addItem(proMaker[j].getName());
combo.addActionListener(this);
cp.add(combo);
cp.add(button1 = new JButton(" "), c);
f.pack();
f.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent evt)
System.exit(0);
f.setVisible(true);
private void populateFields(int index) {
Maker maker = proMaker[index];
fields[0].setText(Long.toString(maker.getNumberCode()));
fields[1].setText(maker.getName());
fields[2].setText(Long.toString(maker.getUnits()));
fields[3].setText(Double.toString(maker.getPrice()));
fields[4].setText(Double.toString(maker.getSum()));
fields[5].setText(Double.toString(maker.totalAllInventory(proMaker)));
fields[6].setText(maker.getManufact());
fields[7].setText(Double.toString(maker.getSum()*.05));
class Maker {
int itemNumber;
String name;
int units;
double price;
String manufacturer;
public Maker(int n, String name, double price, int units, String manufac) {
itemNumber = n;
this.name = name;
this.price = price;
this.units = units;
manufacturer = manufac;
public int getNumberCode() { return itemNumber; }
public String getName() { return name; }
public int getUnits() { return units; }
public double getPrice() { return price; }
public double getSum() { return units*price; }
public String getManufact() { return manufacturer; }
public double totalAllInventory(Maker[] makers) {
double total = 0;
for(int j = 0; j < makers.length; j++)
total += makers[j].getSum();
return total;
}}// I have made some modifications. Please try this.
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.JButton;
public class InventoryTAH implements ActionListener
Maker[] proMaker;
JTextField[] fields;
NumberFormat nf;
int currentInv = 0;
public void actionPerformed(ActionEvent e)
currentInv= ((JComboBox)e.getSource()).getSelectedIndex();
populateFields(currentInv);
public static void main(String[] args)
try
UIManager.setLookAndFeel(
"com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
catch (Exception e)
System.err.println(e.getClass().getName() + ": " + e.getMessage());
InventoryTAH test = new InventoryTAH();
test.initMakers();
test.showGUI();
test.populateFields(0);
private void initMakers() {
proMaker = new Maker[10];
proMaker[0] = new Maker( 1, "Pens",1.59,100,"Bic");
proMaker[1] = new Maker( 2, "Pencils", .65, 100,"Mead");
proMaker[2] = new Maker( 3, "Markers", 1.29, 100,"Sharpie");
proMaker[3] = new Maker( 4, "Paperclips", 1.19, 100,"Staples");
proMaker[4] = new Maker( 5, "Glue", .85, 100,"Elmer's");
proMaker[5] = new Maker( 6, "Tape", .50, 100,"3m");
proMaker[6] = new Maker( 7, "Paper", 1.85, 100,"Mead");
proMaker[7] = new Maker( 8, "Stapler", 2.21, 100,"Swingline");
proMaker[8] = new Maker( 9, "Folders", .50, 100,"Mead");
proMaker[9] = new Maker( 10, "Rulers", .27, 100,"Stanley");
int maxNum = 10;
int currentNum = 0;
Action firstAction = new AbstractAction("First")
public void actionPerformed(ActionEvent evt)
currentInv = 0;
populateFields(currentInv);
JButton firstButton = new JButton(firstAction);
Action previousAction = new AbstractAction("Previous")
public void actionPerformed(ActionEvent evt)
currentInv--;
if (currentInv < 0)
currentInv = maxNum - 1;
populateFields(currentInv);
JButton previousButton = new JButton(previousAction);
Action nextAction = new AbstractAction("Next")
public void actionPerformed(ActionEvent evt)
currentInv++;
if (currentInv >= maxNum)
currentInv = 0;
populateFields(currentInv);
JButton nextButton = new JButton(nextAction);
Action lastAction = new AbstractAction("Last")
public void actionPerformed(ActionEvent evt)
currentInv = maxNum-1;
populateFields(currentInv);
JButton lastButton = new JButton(lastAction);
JPanel buttonPanel = new JPanel( );
private void showGUI() {
JLabel l;
JButton button1;
JButton button2;
fields = new JTextField[8];
JFrame f = new JFrame("Inventory");
Container cp = f.getContentPane();
cp.setLayout(new GridBagLayout());
cp.setBackground(UIManager.getColor(Color.BLACK));
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = GridBagConstraints.RELATIVE;
c.gridwidth = 1;
c.gridheight = 1;
c.insets = new Insets(2, 2, 2, 2);
c.anchor = GridBagConstraints.EAST;
cp.add(l = new JLabel("Item Number:", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('a');
cp.add(l = new JLabel("Item Name:", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('b');
cp.add(l = new JLabel("Number of Units in Stock:", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('c');
cp.add(l = new JLabel("Price per Unit: $", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('d');
cp.add(l = new JLabel("Total cost of Item: $", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('e');
cp.add(l = new JLabel("Total Value of Merchandise in Inventory: $", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('f');
cp.add(l = new JLabel("Manufacturer:", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('g');
cp.add(l = new JLabel("Restocking Fee: $", SwingConstants.CENTER), c);
l.setDisplayedMnemonic('h');
c.gridx = 1;
c.gridy = 0;
c.weightx = 1.0;
c.fill = GridBagConstraints.HORIZONTAL;
c.anchor = GridBagConstraints.CENTER;
cp.add(fields[0] = new JTextField(), c);
fields[0].setFocusAccelerator('a');
c.gridx = 1;
c.gridy = GridBagConstraints.RELATIVE;
cp.add(fields[1] = new JTextField(), c);
fields[1].setFocusAccelerator('b');
cp.add(fields[2] = new JTextField(), c);
fields[2].setFocusAccelerator('c');
cp.add(fields[3] = new JTextField(), c);
fields[3].setFocusAccelerator('d');
cp.add(fields[4] = new JTextField(), c);
fields[4].setFocusAccelerator('e');
cp.add(fields[5] = new JTextField(), c);
fields[5].setFocusAccelerator('f');
cp.add(fields[6] = new JTextField(), c);
fields[6].setFocusAccelerator('g');
cp.add(fields[7] = new JTextField(), c);
fields[7].setFocusAccelerator('h');
c.weightx = 0.0;
c.fill = GridBagConstraints.NONE;
cp.add(firstButton);
cp.add(previousButton);
cp.add(nextButton);
cp.add(lastButton);
JComboBox combo = new JComboBox();
for(int j = 0; j < proMaker.length; j++)
combo.addItem(proMaker[j].getName());
combo.addActionListener(this);
cp.add(combo);
cp.add(button1 = new JButton(" "), c);
f.pack();
f.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent evt)
System.exit(0);
f.setVisible(true);
private void populateFields(int index) {
Maker maker = proMaker[index];
fields[0].setText(Long.toString(maker.getNumberCode()));
fields[1].setText(maker.getName());
fields[2].setText(Long.toString(maker.getUnits()));
fields[3].setText(Double.toString(maker.getPrice()));
fields[4].setText(Double.toString(maker.getSum()));
fields[5].setText(Double.toString(maker.totalAllInventory(proMaker)));
fields[6].setText(maker.getManufact());
fields[7].setText(Double.toString(maker.getSum()*.05));
class Maker {
int itemNumber;
String name;
int units;
double price;
String manufacturer;
public Maker(int n, String name, double price, int units, String manufac) {
itemNumber = n;
this.name = name;
this.price = price;
this.units = units;
manufacturer = manufac;
public int getNumberCode() { return itemNumber; }
public String getName() { return name; }
public int getUnits() { return units; }
public double getPrice() { return price; }
public double getSum() { return units*price; }
public String getManufact() { return manufacturer; }
public double totalAllInventory(Maker[] makers) {
double total = 0;
for(int j = 0; j < makers.length; j++)
total += makers[j].getSum();
return total;
}} -
Please help...my browser can't display applets
I know it might sound inept to be asking something about my mozilla browser in this forum but right now I am studying Java and using my browser to view the applet exercises I make. I am particularly in the methods section where you have to make recursions (I am using JAVA 2 how to program Third Edition by Deitel). I made my own version of the fibonacci program in the book . It has a GUI, action listener and the method where all the calculations take place. Unfortunately, when I test it on my brower, Mozilla Fireforx, it just displays the GUI and whole program does not work. The compiler, in this case javac, cannot sense anything wrong and I take it that my code is correct. However nothing still happens when I test it on my browser. As previously mentioned, it just displays the GUI and that's all. I really do not know what is wrong. Is it with my code or with the browser? Or is with the fact that I am using an outdated version of JAVA 2 how to program with a new version of J2SDK that makes my code incompatible with the new technology? please help. TY
Here's my code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class AppletCode extends JApplet implements ActionListener {
JLabel inputLabel, outputLabel;
JTextField input, output;
public void init(){
Container c = getContentPane();
c.setLayout(new FlowLayout());
JLabel inputLabel = new JLabel();
inputLabel.setText("Enter an Integer and press Enter");
c.add(inputLabel);
JTextField input = new JTextField(10);
input.addActionListener(this);
c.add(input);
JLabel outputLabel = new JLabel();
outputLabel.setText("Fibonacci Value is");
c.add(outputLabel);
JTextField output = new JTextField(20);
output.setEditable(false);
c.add(output);
} // GUI
public void actionPerformed(ActionEvent e) {
long number, fibonacciValue;
number = Long.parseLong(input.getText());
fibonacciValue = fibonacci(number);
output.setText(Long.toString(fibonacciValue));
} // Action Listener
public long fibonacci(long x) {
if (x==0 || x==1)
return x;
else
return fibonacci(x-1) + fibonacci(x-2);
} // Fibonacci Module
}I don't see anything obviously wrong with your code, but it's been a while since i coded applets, so there might still be something wrong. What exactly does not work? You see the 2 labels and the text fields? Can you enter any text into the text field? Have you looked into the Java Console wether it prints any exceptions? (and please use the [ code][ /code] tags to mark your code (without the spaces obviously))
-
Button to frame | button going back to the main frame (please help)
these are the codes, by clicking the "FCFS" button it will generate another frame and from that frame another button will be pressed "accept" and it will go to another frame....
my problem is that i nid to put codes on the "back" button to go back to the main frame were it started... please help me... thnks
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Oscon extends JFrame
private JButton fcfsB, priorityB, sjfB, rrB, exitB, creditsB;
private fcfsButtonHandler fbHandler;
private priorityButtonHandler pbHandler;
private sjfButtonHandler sbHandler;
private rrButtonHandler rbHandler;
private exitButtonHandler ebHandler;
private creditsButtonHandler cbHandler;
public Oscon()// main frame
fcfsB = new JButton ("FCFS");
fbHandler = new fcfsButtonHandler();
fcfsB.addActionListener(fbHandler);
priorityB = new JButton ("PRIORITY");
pbHandler = new priorityButtonHandler();
priorityB.addActionListener(pbHandler);
sjfB = new JButton ("SJF");
sbHandler = new sjfButtonHandler();
sjfB.addActionListener(sbHandler);
rrB = new JButton ("RR");
rbHandler = new rrButtonHandler();
rrB.addActionListener(rbHandler);
exitB = new JButton ("EXIT");
ebHandler = new exitButtonHandler();
exitB.addActionListener(ebHandler);
creditsB = new JButton ("CREDITS");
cbHandler = new creditsButtonHandler();
creditsB.addActionListener(cbHandler);
setTitle("CPU SCHEDULING");
Container pane =getContentPane ();
pane.setLayout(new GridLayout(2,3));
pane.add(fcfsB);
pane.add(priorityB);
pane.add(sjfB);
pane.add(rrB);
pane.add(exitB);
pane.add(creditsB);
setSize(500,100);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
public class fcfsButtonHandler implements ActionListener
public void actionPerformed(ActionEvent e)
JFrame frame = new JFrame("FCFCS setting");
final JLabel FCFSProcessL, FCFSp1L,FCFSp2L,FCFSp3L,FCFSp4L, FCFSbt;
final JTextField FCFSp1TF,FCFSp2TF,FCFSp3TF,FCFSp4TF;
FCFSProcessL = new JLabel("PROCESS", SwingConstants.CENTER);
FCFSp1L = new JLabel("P1:", SwingConstants.CENTER);
FCFSp2L = new JLabel("P2:", SwingConstants.CENTER);
FCFSp3L = new JLabel("P3:", SwingConstants.CENTER);
FCFSp4L = new JLabel("P4:", SwingConstants.CENTER);
FCFSbt = new JLabel("BT:", SwingConstants.CENTER);
FCFSp1TF= new JTextField (10);
FCFSp2TF= new JTextField (10);
FCFSp3TF= new JTextField (10);
FCFSp4TF= new JTextField (10);
JButton FCFSokB = new JButton ("Accept");
FCFSokB.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
JFrame frame2 = new JFrame("FCFCS");
frame2.setSize(500,500);
frame2.setVisible(true);
frame2.setDefaultCloseOperation(EXIT_ON_CLOSE);
JButton FCFSclearB = new JButton ("clear");
FCFSclearB.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
FCFSp1TF.setText("");
FCFSp2TF.setText("");
FCFSp3TF.setText("");
FCFSp4TF.setText("");
JButton FCFSBackB = new JButton ("Back");
FCFSBackB.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
setTitle("CPU SCHEDULING");
frame.setLayout(new GridLayout(7,2));
frame.add(FCFSProcessL);
frame.add(FCFSbt);
frame.add(FCFSp1L);
frame.add(FCFSp1TF);
frame.add(FCFSp2L);
frame.add(FCFSp2TF);
frame.add(FCFSp3L);
frame.add(FCFSp3TF);
frame.add(FCFSp4L);
frame.add(FCFSp4TF);
frame.add(FCFSokB);
frame.add(FCFSclearB);
frame.add(FCFSBackB);
frame.setSize(200,250);
frame.setVisible(true);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
public class priorityButtonHandler implements ActionListener
public void actionPerformed(ActionEvent e)
public class sjfButtonHandler implements ActionListener
public void actionPerformed(ActionEvent e)
System.exit (0);
public class rrButtonHandler implements ActionListener
public void actionPerformed(ActionEvent e)
System.exit (0);
public class exitButtonHandler implements ActionListener
public void actionPerformed(ActionEvent e)
System.exit (0);
public class creditsButtonHandler implements ActionListener
public void actionPerformed(ActionEvent e)
System.exit (0);
public static void main (String [] args)
Oscon O = new Oscon();
}please help me revise my program, im almost done, i just nid to set the progress bar that it will run according to the waiting time, or set the progress bar to run in order.. these are the variable names of the progress bar(current1, then current2, then current3 then current4).
i looked it up on the site and i cant really understand it... i just did the part where i included the progress bar to the interface. ijust want the 4 progress bars to run after clicking the accept button.... Please help me!!! its for my project and i didnt slept last night just working on this... i just nid help sir... thnks...
these are the codes i made:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JProgressBar;
public class CPUSched
public CPUSched()
JFrame frame = new JFrame();
JProgressBar current1, current2, current3, current4;
Thread runner;
int num = 0;
final JLabel ProcessL, p1L,p2L,p3L,p4L, bt, prioL, tqL, wtL, awtL, awtLA;
final JTextField p1TF,p2TF,p3TF,p4TF, prio1TF, prio2TF,prio3TF,prio4TF, tqTF ;
final JLabel blank1, blank2, blank3, blank4, blank5, blank6, blank7, blank8, blank9, blank10, blank11,
blank12, blank13, blank14, blank15;
final JLabel blank16, blank17, blank18, blank19, blank20, blank21, blank22, blank23, blank24, blank25,
blank26, blank27, blank28, blank29, blank30;
current1 = new JProgressBar(0, 2000);
current1.setValue(0);
current1.setStringPainted(true);
current2 = new JProgressBar(0, 2000);
current2.setValue(0);
current2.setStringPainted(true);
current3= new JProgressBar(0, 2000);
current3.setValue(0);
current3.setStringPainted(true);
current4 = new JProgressBar(0, 2000);
current4.setValue(0);
current4.setStringPainted(true);
ProcessL = new JLabel("PROCESS", SwingConstants.CENTER);
p1L = new JLabel("P1:", SwingConstants.CENTER);
p2L = new JLabel("P2:", SwingConstants.CENTER);
p3L = new JLabel("P3:", SwingConstants.CENTER);
p4L = new JLabel("P4:", SwingConstants.CENTER);
bt = new JLabel("Burst Time:", SwingConstants.CENTER);
prioL= new JLabel("Priority (1-4):", SwingConstants.CENTER);
tqL= new JLabel("Time Quantum:", SwingConstants.CENTER);
wtL= new JLabel("Waiting time:", SwingConstants.CENTER);
awtL= new JLabel("Average Waiting time:");
awtLA= new JLabel("");
blank1= new JLabel("");
blank2= new JLabel("");
blank3= new JLabel("" ,SwingConstants.CENTER);
blank4= new JLabel("");
blank5= new JLabel("", SwingConstants.CENTER);
blank6= new JLabel("");
blank7= new JLabel("");
blank8= new JLabel("" ,SwingConstants.CENTER);
blank9= new JLabel("");
blank10= new JLabel("");
blank11= new JLabel("", SwingConstants.CENTER);
blank12= new JLabel("");
blank13= new JLabel("");
blank14= new JLabel("");
blank15= new JLabel("");
blank16= new JLabel("");
blank17= new JLabel("");
blank18= new JLabel("");
blank19= new JLabel("");
blank20= new JLabel("");
blank21= new JLabel("");
blank22= new JLabel("");
blank23= new JLabel("");
blank24= new JLabel("");
blank25= new JLabel("");
blank26= new JLabel("");
blank27= new JLabel("");
blank28= new JLabel("");
blank29= new JLabel("");
blank30= new JLabel("");
p1TF= new JTextField (2);
p2TF= new JTextField (2);
p3TF= new JTextField (2);
p4TF= new JTextField (2);
prio1TF= new JTextField (2);
prio2TF= new JTextField (2);
prio3TF= new JTextField (2);
prio4TF= new JTextField (2);
tqTF= new JTextField (2);
prio1TF.setEditable(false);
prio2TF.setEditable(false);
prio3TF.setEditable(false);
prio4TF.setEditable(false);
tqTF.setEditable(false);
JButton okB = new JButton ("Accept");
okB.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
double iw=0, wtp1, wtp2, wtp3, wtp4;
double bt1, bt2, bt3, bt4;
double averageWT, sumWT;
bt1=Double.parseDouble(p1TF.getText());
bt2=Double.parseDouble(p2TF.getText());
bt3=Double.parseDouble(p3TF.getText());
bt4=Double.parseDouble(p4TF.getText());
wtp1 = iw;
wtp2 = wtp1+bt1;
wtp3 = wtp2+bt2;
wtp4 = wtp3+bt3;
sumWT = wtp1+wtp2+wtp3+wtp4;
averageWT = sumWT/4;
awtLA.setText(""+averageWT);
blank3.setText(""+wtp1);
blank5.setText(""+wtp2);
blank8.setText(""+wtp3);
blank11.setText(""+wtp4);
JButton clearB = new JButton ("Clear");
clearB.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
p1TF.setText("");
p2TF.setText("");
p3TF.setText("");
p4TF.setText("");
awtLA.setText("");
blank3.setText("");
blank5.setText("");
blank8.setText("");
blank11.setText("");
frame.setTitle("First Come First Serve");
frame.setLayout(new GridLayout(6,6));
frame.add(ProcessL);
frame.add(blank1);
frame.add(wtL);
frame.add(bt);
frame.add(prioL);
frame.add(tqL);
frame.add(p1L);
frame.add(current1);
frame.add(blank3);
frame.add(p1TF);
frame.add(prio1TF);
frame.add(tqTF);
frame.add(p2L);
frame.add(current2);
frame.add(blank5);
frame.add(p2TF);
frame.add(prio2TF);
frame.add(blank6);
frame.add(p3L);
frame.add(current3);
frame.add(blank8);
frame.add(p3TF);
frame.add(prio3TF);
frame.add(blank9);
frame.add(p4L);
frame.add(current4);
frame.add(blank11);
frame.add(p4TF);
frame.add(prio4TF);
frame.add(blank12);
frame.add(blank13);
frame.add(blank14);
frame.add(okB);
frame.add(clearB);
frame.add(awtL);
frame.add(awtLA);
frame.setSize(800,200);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
public static void main (String [] args)
CPUSched O = new CPUSched();
} -
Please Help Me, Delete Method(any suggestions!!)
Can anyone spare the time to look at the below three classes and suggest a method that goes into the customerList class and deletes a record from the Oracle DB they are sitting on top of.
For example when the deleteCust button is pressed on the form (customerForm) I would like it to delete the current customer (currentCustomer) that is displayed on the form at the time of the button click.
Can anyone please HELP me, it would be very much appreciated :-)
customer class
import java.util.*;
import java.sql.*;
public class Customer{
private int customer_id;
private String customer_name;
private String address1;
private String address2;
private String town;
private String county;
private String post_code;
private String country;
private String fax;
private String telephone;
private String contact_name;
private String email;
private boolean newCustomer;
//private JobList jobList;
public Customer(int c){
customer_id = c;
newCustomer = true;
public Customer(int inCustomer_id,String inCustomer_name,String inAddress1, String inAddress2, String inTown, String inCounty,String inPost_code,String inCountry,String inFax,String inTelephone,String inContact_name,String inEmail){
customer_id=inCustomer_id;
customer_name=inCustomer_name;
address1=inAddress1;
address2=inAddress2;
town=inTown;
county=inCounty;
post_code=inPost_code;
country=inCountry;
fax=inFax;
telephone=inTelephone;
contact_name=inContact_name;
email=inEmail;
newCustomer = false;
public String getAddress1(){
if (address1 == null)
return ("");
else
return address1;
public String getAddress2(){
if (address2 == null)
return ("");
else
return address2;
public String getCounty(){
if (county == null)
return ("");
else
return county;
public String getFax(){
if (fax == null)
return ("");
else
return fax;
public int getCustomer_id(){
if (customer_id == 0)
return (0);
else
return customer_id;
public String getCustomer_name(){
if (customer_name == null)
return ("");
else
return customer_name;
public String getTelephone(){
if (telephone == null)
return ("");
else
return telephone;
public String getPost_code(){
if (post_code == null)
return ("");
else
return post_code;
public String getTown(){
if (town == null)
return ("");
else
return town;
public String getCountry(){
if (country == null)
return ("");
else
return country;
public String getContact_name(){
if (contact_name == null)
return ("");
else
return contact_name;
public String getEmail(){
if (email == null)
return ("");
else
return email;
/*public JobList getJobList() throws SQLException {
// if the joblist object exists return it otherwise create it
if (jobList != null){
return jobList;
else{
return new JobList(this);
public boolean isNewCustomer(){
return newCustomer;
public void setAddress1(String inAddress1){
address1=inAddress1;
public void setAddress2(String inAddress2){
address2=inAddress2;
public void setCounty(String inCounty){
county=inCounty;
public void setFax(String inFax){
fax=inFax;
public void setCustomer_id(int inCustomer_id){
customer_id = inCustomer_id;
public void setCustomer_name(String inCustomer_name){
customer_name=inCustomer_name;
public void setTelephone(String inTelephone){
telephone=inTelephone;
public void setPost_code(String inPost_code){
post_code=inPost_code;
public void setTown(String inTown){
town=inTown;
public void setCountry(String inCountry){
country=inCountry;
public void setContact_name(String inContact_name){
contact_name=inContact_name;
public void setEmail(String inEmail){
email=inEmail;
customerList class
import java.sql.*;
import java.util.*;
public class CustomerList{
private ResultSet rs ;
private Connection con;
private Statement stmt;
public CustomerList () {
ConnectionManager man = ConnectionManager.getInstance();
con = man.getConnection();
public Customer getFirstCustomer()throws SQLException {
Customer firstCustomer;
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
rs = stmt.executeQuery("select customer_id,customer_name,address1,address2,town,county,post_code,country,fax,telephone,contact_name,email from customer");
rs.next();
firstCustomer = loadCustomer();
return firstCustomer;
public Customer getLastCustomer() throws SQLException{
Customer lastCustomer;
rs.last();
lastCustomer = loadCustomer();
return lastCustomer;
public Customer getNextCustomer()throws SQLException{
Customer nextCustomer ;
if (rs.next()){
nextCustomer = loadCustomer();
else{
nextCustomer = null;
return nextCustomer;
public Customer getPreviousCustomer()throws SQLException{
Customer previousCustomer;
if (rs.previous()){
previousCustomer = loadCustomer();
else
previousCustomer = null;
return previousCustomer;
public Customer findCustomer(int inCustNum) throws SQLException{
Customer foundCust;
if (inCustNum==0){
foundCust = getFirstCustomer();
else{
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
rs = stmt.executeQuery("select customer_id,customer_name,address1,address2,town,county,post_code,country,fax,telephone,contact_name,email from customer where customer_id = "+inCustNum);
if (rs.next()){
foundCust = loadCustomer();
else
foundCust = null;
return foundCust;
public Customer addCust()throws SQLException{
Statement stmt2 = con.createStatement();
ResultSet rsadd = stmt2.executeQuery("select custid.nextval from dual");
rsadd.next();
int id = rsadd.getInt("nextval");
rsadd.close();
stmt2.close();
Customer newCust = new Customer(id);
return newCust;
public Customer saveCustomer(Customer inSaveCust)throws SQLException{
Statement stmt3 = con.createStatement();
int rowNum;
//int incid = inSaveCust.getCid();
if (inSaveCust.isNewCustomer()){
stmt3.executeUpdate("insert into customer values ("
+inSaveCust.getCustomer_id()
+",'"+inSaveCust.getCustomer_name()
+"','"+inSaveCust.getAddress1()
+"','"+inSaveCust.getAddress2()
+"','"+ inSaveCust.getTown()
+"','"+ inSaveCust.getCounty()
+"','"+inSaveCust.getPost_code()
+"','"+inSaveCust.getCountry()
+"','"+inSaveCust.getFax()
+"','"+ inSaveCust.getTelephone()
+"','"+inSaveCust.getContact_name()
+"','"+inSaveCust.getEmail()+"')");
inSaveCust = getFirstCustomer();//refreshes list after insert
inSaveCust = getLastCustomer();// goes to the inserted record ie last one
else {
rowNum = rs.getRow();//traps the record number so can be returned to
stmt3.executeUpdate("update customer set customer_name = '"+inSaveCust.getCustomer_name()
+ "', address1 = '"+inSaveCust.getAddress1()
+ "', address2 = '"+inSaveCust.getAddress2()
+ "', town = '"+ inSaveCust.getTown()
+ "', county = '"+ inSaveCust.getCounty()
+ "', post_code = '"+inSaveCust.getPost_code()
+ "', telephone = '"+inSaveCust.getCountry()
+ "', fax = '"+inSaveCust.getFax()
+ "', country = '"+inSaveCust.getTelephone()
+ "', contact_name = '"+inSaveCust.getContact_name()
+ "', email = '"+inSaveCust.getEmail()
+"' where customer_id = "+inSaveCust.getCustomer_id());
inSaveCust = getFirstCustomer();
rs.absolute(rowNum); // points back to same record number as updated
inSaveCust = loadCustomer();
con.commit();
return inSaveCust;
//Trying to add in the delete method here(as u can see it is not working)
/*public Customer deleteCustomer() throws SQL Exception {
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
rs = stmt4.executeQuery("delete from customer where customer_id = "Integer.parseInt(textCustomer_id.getText()));
rs.next();
firstCustomer = loadCustomer();
return firstCustomer;
public boolean isFirst() throws SQLException{
return rs.isFirst();
public boolean isLast() throws SQLException{
return rs.isLast();
public Customer loadCustomer ()throws SQLException{
Customer cust = new Customer(rs.getInt("customer_id"),rs.getString("customer_name"),rs.getString("address1"),
rs.getString("address2"),rs.getString("town"),rs.getString("county"),
rs.getString("post_code"),rs.getString("country"),rs.getString("fax"),
rs.getString("telephone"),rs.getString("contact_name"),rs.getString("email"));
return cust;
customerForm class
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.util.*;
public class CustomerForm extends JFrame implements ActionListener {
private Customer currentCustomer;
private CustomerList inCustomerList;
private JPanel panel;
private JTextField textCustomer_id,textCustomer_name,textAddress1,textAddress2,textTown,
textCounty,textPost_code,textCountry,textTelephone,textFax,textContact_name,textEmail,textFind;
private JButton nextCust, prevCust,firstCust,lastCust,newCust,
findCust,add,save,delete,jobs,close,deleteCust;
public CustomerForm(CustomerList inC)throws SQLException{
inCustomerList = inC;
currentCustomer = inCustomerList.getFirstCustomer();
displayForm();
displayFields();
setTextFields();
displayButtons();
getContentPane().add(panel);
setVisible(true);
public void displayForm() throws SQLException{
setTitle("Customer Form");
setSize(700,500);
// Center the frame
Dimension dim = getToolkit().getScreenSize();
setLocation(dim.width/2-getWidth()/2, dim.height/2-getHeight()/2);
getContentPane().setLayout(new BorderLayout());
Border etched = BorderFactory.createEtchedBorder();
panel = new JPanel();
panel.setLayout( null );
Border paneltitled = BorderFactory.createTitledBorder(etched,"");
panel.setBorder(paneltitled);
panel.setBackground(new Color(224,224,255));
public void displayFields() throws SQLException{
int x = 10;
int y = 50;
int textheight = 20;
int textwidth = 150;
int labelwidth = 110;
int ydist = textheight + 10;
int xdist = textwidth*2;
JLabel labelCustomer_id = new JLabel("Customer Number:");
labelCustomer_id.setBounds( x, y, labelwidth, textheight);
panel.add(labelCustomer_id);
JLabel labelCustomer_name = new JLabel("Customer Name:");
labelCustomer_name.setBounds(xdist, y, labelwidth, textheight);
panel.add(labelCustomer_name);
JLabel labelAddress1 = new JLabel("Address 1:");
labelAddress1.setBounds( x, y+ydist, labelwidth, textheight);
panel.add(labelAddress1);
JLabel labelAddress2 = new JLabel("Address 2:");
labelAddress2.setBounds( xdist, y+ydist, labelwidth, textheight);
panel.add(labelAddress2);
JLabel labelTown = new JLabel("Town:");
labelTown.setBounds(x, y+ydist*2, labelwidth, textheight);
panel.add(labelTown);
JLabel labelCounty = new JLabel("County:");
labelCounty.setBounds(xdist, y+ydist*2, labelwidth, textheight);
panel.add(labelCounty);
JLabel labelPost_code = new JLabel("Post Code:");
labelPost_code.setBounds(x, y+ydist*3, labelwidth, textheight);
panel.add(labelPost_code);
JLabel labelCountry = new JLabel("Country:");
labelCountry.setBounds(xdist, y+ydist*3, labelwidth, textheight);
panel.add(labelCountry);
JLabel labelTelephone = new JLabel("Phone:");
labelTelephone.setBounds(x, y+ydist*4, labelwidth, textheight);
panel.add(labelTelephone);
JLabel labelFax = new JLabel("Fax:");
labelFax.setBounds(xdist, y+ydist*4, labelwidth, textheight);
panel.add(labelFax);
JLabel labelContact_name = new JLabel("Contact Name:");
labelContact_name.setBounds(x, y+ydist*5, labelwidth, textheight);
panel.add(labelContact_name);
JLabel labelEmail = new JLabel("E-mail address:");
labelEmail.setBounds(xdist, y+ydist*5, labelwidth, textheight);
panel.add(labelEmail);
JLabel labelFind = new JLabel("Customer Number Search:");
labelFind.setBounds( 40, 360, 200, textheight);
panel.add(labelFind);
textAddress1 = new JTextField();
textAddress1.setBounds(x+labelwidth, y+ydist, textwidth, textheight);
panel.add(textAddress1);
textAddress2 = new JTextField();
textAddress2.setBounds(xdist+labelwidth, y+ydist, textwidth, textheight);
panel.add(textAddress2);
textTown = new JTextField();
textTown.setBounds(x+labelwidth, y+ydist*2, textwidth, textheight);
panel.add(textTown);
textCounty = new JTextField();
textCounty.setBounds(xdist+labelwidth, y+ydist*2, textwidth, textheight);
panel.add(textCounty);
textPost_code = new JTextField();
textPost_code.setBounds(x+labelwidth, y+ydist*3, textwidth, textheight);
panel.add(textPost_code);
textCountry = new JTextField();
textCountry.setBounds(xdist+labelwidth, y+ydist*3, textwidth, textheight);
panel.add(textCountry);
textTelephone = new JTextField();
textTelephone.setBounds(x+labelwidth, y+ydist*4, textwidth, textheight);
panel.add(textTelephone);
textFax = new JTextField();
textFax.setBounds(xdist+labelwidth, y+ydist*4, textwidth, textheight);
panel.add(textFax);
textContact_name = new JTextField();
textContact_name.setBounds(x+labelwidth, y+ydist*5, textwidth, textheight);
panel.add(textContact_name);
textEmail = new JTextField();
textEmail.setBounds(xdist+labelwidth, y+ydist*5, textwidth+50, textheight);
panel.add(textEmail);
textFind = new JTextField();
textFind.setBounds(200, 360, 80, textheight);
panel.add(textFind);
textCustomer_id = new JTextField();
textCustomer_id.setBounds(x+labelwidth, y, textwidth, textheight);
panel.add(textCustomer_id);
textCustomer_name = new JTextField();
textCustomer_name.setBounds(xdist+labelwidth, y, textwidth+50, textheight);
panel.add(textCustomer_name);
public boolean delete() {
textCustomer_id.setText("");
textCustomer_name.setText("");
textAddress1.setText("");
textAddress2.setText("");
textTown.setText("");
textCounty.setText("");
textPost_code.setText("");
textCountry.setText("");
textTelephone.setText("");
textFax.setText("");
textContact_name.setText("");
textEmail.setText("");
textFind.setText("");
return true;
public void displayButtons(){
firstCust= new JButton("FIRST");
firstCust.addActionListener(this);
firstCust.setBounds(50, 430, 100, 20 );
panel.add( firstCust );
nextCust = new JButton("NEXT");
nextCust.addActionListener(this);
nextCust.setBounds(150, 430, 100, 20 );
panel.add( nextCust );
prevCust = new JButton("PREVIOUS");
prevCust.addActionListener(this);
prevCust.setBounds(250, 430, 100, 20 );
panel.add( prevCust );
lastCust= new JButton("LAST");
lastCust.addActionListener(this);
lastCust.setBounds(350, 430, 100, 20 );
panel.add( lastCust );
findCust= new JButton("FIND");
findCust.addActionListener(this);
findCust.setBounds(350, 360, 100, 20 );
panel.add( findCust );
add = new JButton("ADD");
add.addActionListener(this);
add.setBounds(150, 400, 100, 20 );
panel.add( add );
save = new JButton("SAVE");
save.addActionListener(this);
save.setBounds(250, 400, 100, 20 );
panel.add( save );
jobs = new JButton("JOBS");
jobs.addActionListener(this);
jobs.setBounds(550, 360, 100, 20 );
panel.add( jobs );
close = new JButton("CLOSE");
close.addActionListener(this);
close.setBounds(550, 430, 100, 20 );
panel.add( close );
delete = new JButton("DELETE");
delete.addActionListener(this);
delete.setBounds(350, 400, 100, 20 );
panel.add( delete );
deleteCust = new JButton("DELETECUST");
deleteCust.addActionListener(this);
deleteCust.setBounds(450, 400, 100, 20);
panel.add( deleteCust );
public void getTextFields(){
currentCustomer.setCustomer_id(Integer.parseInt(textCustomer_id.getText()));
currentCustomer.setCustomer_name(textCustomer_name.getText());
currentCustomer.setAddress1(textAddress1.getText());
currentCustomer.setAddress2(textAddress2.getText());
currentCustomer.setTown(textTown.getText());
currentCustomer.setCounty(textCounty.getText());
currentCustomer.setPost_code(textPost_code.getText());
currentCustomer.setCountry(textCountry.getText());
currentCustomer.setFax(textFax.getText());
currentCustomer.setTelephone(textTelephone.getText());
currentCustomer.setContact_name(textContact_name.getText());
currentCustomer.setEmail(textEmail.getText());
public void setTextFields() throws SQLException{
textCustomer_id.setText(String.valueOf(currentCustomer.getCustomer_id()));
textCustomer_id.setEditable(false);
textCustomer_name.setText(currentCustomer.getCustomer_name());
textAddress1.setText(currentCustomer.getAddress1());
textAddress2.setText(currentCustomer.getAddress2());
textTown.setText(currentCustomer.getTown());
textCounty.setText(currentCustomer.getCounty());
textPost_code.setText(currentCustomer.getPost_code());
textCountry.setText(currentCustomer.getCountry());
textFax.setText(currentCustomer.getFax());
textTelephone.setText(currentCustomer.getTelephone());
textContact_name.setText(currentCustomer.getContact_name());
textEmail.setText(currentCustomer.getEmail());
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
try {
if (source == nextCust)
currentCustomer = inCustomerList.getNextCustomer();
else if (source == prevCust)
currentCustomer = inCustomerList.getPreviousCustomer();
else if (source == findCust) {
try {
currentCustomer =
inCustomerList.findCustomer(Integer.parseInt(textFind.getText()));
catch (NumberFormatException ex) {
JOptionPane.showMessageDialog(
null, "Invalid Customer number", "ERROR",
JOptionPane.ERROR_MESSAGE);
if (currentCustomer == null) {
JOptionPane.showMessageDialog(null, "Customer not found");
currentCustomer = inCustomerList.getFirstCustomer();
textFind.setText(null);
else if (source == firstCust)
currentCustomer = inCustomerList.getFirstCustomer();
else if (source == lastCust)
currentCustomer = inCustomerList.getLastCustomer();
else if (source == add) {
currentCustomer = inCustomerList.addCust();
add.setEnabled(false);
else if (source == delete) {
delete();
else if (source == save) {
add.setEnabled(true);
getTextFields();
currentCustomer = inCustomerList.saveCustomer(currentCustomer);
//else if (source == jobs) {
// JFrame newJobForm = new JobForm(currentCustomer.getJobList());
//else if (source == deleteCust) {
//........... //currentCustomer = inCustomerList.deleteCustomer(currentCustomer);
else if (source == close) {
dispose();
setTextFields();
nextCust.setEnabled(!inCustomerList.isLast());
prevCust.setEnabled(!inCustomerList.isFirst());
firstCust.setEnabled(!inCustomerList.isFirst());
lastCust.setEnabled(!inCustomerList.isLast());
catch (SQLException ex) {
System.out.println("Failed");
System.out.println(ex.getMessage());
ex.printStackTrace();
System.exit(-1);
PLEASE HELP ME!!!http://www.ss64.demon.co.uk/orasyntax/
-
I'm trying to create a GUI Calculator but cannot get my program to compile. Please could someone assistm, thanks.
import java.io.*;
import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class CalculatorFrame extends JFrame
private Container contentPane;
//The componenets used in the calculator
private JTextField display;
private JButton addition;
private JButton subtract;
private JButton multiply;
private JButton divide;
private JButton mod;
private JButton enter;
private JButton [] digits;
//End of components
//Integer representations for the arithmetic operations needed
private final static int ADD = 1;
private final static int SUB = 2;
private final static int MUL = 3;
private final static int DIV = 4;
private final static int MOD = 5;
//ENd of arithmethic operations
//Integer holding the operator that the user requested
private int op;
//Boolean variable to help perform the calculations
private boolean firstFilled;
private boolean clearScreen;
//Constructor for the class
public CalculatorFrame()
contentPane=new Container();
this.setSize(400,300); //sets the size of the frame
this.setTitle("MIS 222 Calculator"); //sets the title of the frame
//allows the "X" box in the upper right hand corner to close the entire application
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentPane=this.getContentPane(); //gets the content pane
//Methods
addDisplay();
addDigits();
addDigitActionListeners();
addOperation();
private void addDisplay()
JLabel displayLab = new JLabel("Answer");
JPanel north = new JPanel();
north.add(displayLab);
contentPane.add(north, "North");
//diplay was already declared above the constructor
display = new JTextField(25);
//adding the components to the panel
north.add(displayLab);
north.add(display);
//adding the panel to frame's content pane
contentPane.add(north, "North");
//Declaring the global digits array
private void addDigits()
//Add 1 large panel to hold the 3 inner panels
JPanel digPanel = new JPanel();
//Set the panel's preferred size so that it will keep everything in line
digPanel.setPreferredSize(new Dimension(200, 275));
//Initialize the top 3 digits' JPanel and set its preferrd size
JPanel topDigits = new JPanel();
topDigits.setPreferredSize(new Dimension(200,60));
//Initialize the middle 2 digits' JPanel and set its preferred size
JPanel midDigits = new JPanel();
midDigits.setPreferredSize(new Dimension(200,60));
//Initialize the bottom digits' JPanel and set its preferred size
JPanel botDigits = new JPanel();
botDigits.setPreferredSize(new Dimension(200, 75));
//Initialize the JButton array
digits = new JButton[11];
//Initialize each of the top Panel's digit buttons, and add it to the top panel
for(int i=1; i<4; i++)
String lab=(new Integer(i)).toString();
digits=new JButton(lab);
topDigits.add(digits[i]);
//Adding the top Digit Panel to the overall digit panel
digPanel.add(topDigits, BorderLayout.CENTER);
//Adding the middle Digit Panel to the overall digit panel
digPanel.add(midDigits, BorderLayout.CENTER);
//Adding the bottom Digit Panel to the overall digit panel
digPanel.add(botDigits, BorderLayout.CENTER);
//Add the overall digit Panel to the Frame's contentpane
contentPane.add(digPanel, BorderLayout.CENTER);
//Method created to add the DigitAction Listeners
addDigitActionListeners();
//Method created to add all of the DigitActionListeners
private void addDigitActionListeners()
for(int i=0; i<10; i++)
digits[i].addActionListener(new DigitActionListener(i));
digits[10].addActionListener(new DigitActionListener("."));
//DigitActionListener class
public class DigitActionListener implements ActionListener
private String myNum;
public DigitActionListener(int num)
myNum=""+num;
public DigitActionListener(String num)
myNum=num;
public void actionPerformed(ActionEvent e)
if(display.getText().equals("Please enter a valid number")|| clearScreen)
clearScreen=false;
display.setText("");
//OperatorActionListener class
public void OpActionListener implements ActionListener
private int myOpNum;
public OpActionListener(int op)
myOpNum=op;
public void actionPerformed(ActionEvent e)
{ //Checks to see if the user has already enterd a number
if(!firstFilled)
try{
//Parse the number entered
String number=display.getText();
dNum1=Double.parseDouble(number);
//Sets the flag for the firstFilled to true
firstFilled=true
//Sets the op variable so when the "Enter" button is pressed, it will know which operation to perform
op=myOpNum;
//Clears the textbox
display.setText("");
catch(Exception er)
display.setText("Please enter a valid number");
//This is the second number being entered
else{
try{
String number=display.getText();
String result;
dNum2=Double.parseDouble(number);
firstFilled=true;
op=myOpNum;
display.setText("");
catch(Exception er)
display.setText("Please enter a valid number");
private void addOperation()
JPanel opPanel=new JPanel();
opPanel.setPreferredSize(new Dimension(75,200));
JButton clear = new JButton("C");
JButton addition = new JButton("+");
JButton subtraction = new JButton("-");
JButton multiply = new JButton("*");
JButton divide = new JButton("/");
JButton mod = new JButton("%");
JButton enter = new JButton("Enter");
addition.addActionListener(new OpActionListener(ADD));
subtraction.addActionListener(new OpActionListener(SUB));
multiply.addActionListener(new OpActionListener(MUL));
divide.addActionListener(new OpActionListener(DIV));
mod.addActionListener(new OpActionListener(MOD));
clear.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
display.setText("");
firstFilled=false;
enter.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
double result;
String answer="";
String number = display.getText();
dNum2 = Double.parseDouble(number);
dNum1=Double.parseDouble(number);
switch(op)
case ADD:
result = dNum1 + dNum2;
break;
case SUB:
result = dNum1 - dNum2;
break;
case MUL:
result = dNum1 * dNum2;
break;
case DIV:
result = dNum1 / dNum2;
break;
default:
result= -1.0;
break;
if(result==(int)result)
answer=(new Integer((int)result)).toString();
else
answer=(new Double(result)).toString();
display.setText(answer);
clearScreen=true;
firstFilled=false;
dNum1=0;
dNum2=0;
opPanel.add(clear);
opPanel.add(addition);
opPanel.add(subtraction);
opPanel.add(multiply);
opPanel.add(divide);
opPanel.add(mod);
opPanel.add(enter);
contentPane.add(opPanel, "East");
//Creating the frame object
public class CalculatorMain
public void main(String[] args)
CalculatorFrame cf=new CalculatorFrame();
cf.show();
ERRORS THAT I HAVE!!:
javac calculatorframe.javacalculatorframe.java:150: '(' expected
public void OpActionListener implements ActionListener
^
calculatorframe.java:7: class CalculatorFrame is public, should be declared in a file named CalculatorFrame.java
public class CalculatorFrame extends JFrame
^
calculatorframe.java:54: cannot resolve symbol
symbol : method addOperation ()
location: class CalculatorFrame
addOperation();
^
3 errors
>Hi, actually it's all written there:
>
ERRORS THAT I HAVE!!:
javac calculatorframe.javacalculatorframe.java:150: '(' expected
public void OpActionListener implements
ActionListenerpublic void ... is part of a possible method signature. That's probably why the compiler expects '(' as this is need for a method.
To define a class use:
public class ... (or better: private class ..., if the class is not used outside of this file.
^
calculatorframe.java:7: class CalculatorFrame is
public, should be declared in a file named
CalculatorFrame.java
public class CalculatorFrame extends JFrame
^As it says, you defined a class CalculatorFrame in a file calculatorframe.java. But the file name should be the same as the class name (case sensitive). Java classes should start with capital letters, so rename the file to:
CalculatorFrame.java
calculatorframe.java:54: cannot resolve symbol
symbol : method addOperation ()
location: class CalculatorFrame
addOperation();
^
3 errors
>You didn't declare the method 'addOperation' (-> cannot resolve symbol; which simbol: method addOperation (); where: location: class CalculatorFrame; you see it's all there)
Note there is a method called 'addOperation' in the class OpActionListener, but not in CalculatorFrame.
Note I didn't read the code, just the error messages. I hope this helps.
-Puce -
PrintStream Problem, please help!
My goal is to create and print to a file. The program will create the file but won't print to it. I can't find anything wrong, please take look and help if you can.
import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
public class ScribbleAndSave extends JApplet implements ActionListener
// Declaring a JTextField object
public static JTextField jtxField;
// Create an instance of the applet
public static ScribbleAndSave applet = new ScribbleAndSave();
// Declare an instance of JFrame
private static JFrame frame;
private JButton jbt = new JButton("Save");
// This main method enables the applet to run as an application
public static void main(String[] args)
// Create a frame object
frame = new JFrame("Scribbling Demo");
// Add the applet instance to the frame object
frame.getContentPane().add(applet, BorderLayout.CENTER);
// Add the JTextField instance to the frame object
jtxField = new JTextField();
// Invoke int() and start() to start the applet
applet.init();
applet.start();
// Display the frame
frame.setSize(300, 300);
frame.setVisible(true);
// Initialize the applet
public void init()
// Create a paint panel and add it to the applet
getContentPane().add(new ScribblePanel(), BorderLayout.CENTER);
getContentPane().add(jtxField, BorderLayout.SOUTH);
getContentPane().add(jbt, BorderLayout.NORTH);
jbt.addActionListener(this);
public void actionPerformed(ActionEvent e)
String actionCommand = e.getActionCommand();
if (e.getSource() instanceof JButton)
if ("Save".equals(actionCommand))
try
pw = new PrintWriter(new FileOutputStream(myFile));
for (int i=0; i<ScribblePanel.mainVector.size(); i++)
tempPointsVector = (Vector)ScribblePanel.mainVector.elementAt(i);
for (int j = 1; j<tempPointsVector.size(); j++)
tempLineStart = (Point)tempPointsVector.elementAt(j-1);
tempLineDraw = (Point)tempPointsVector.elementAt(j);
pw.print(tempLineStart.x + " " + tempLineStart.y + " " tempLineDraw.x " " + tempLineDraw + " ");
catch (IOException ex)
System.out.print(" Place holder ");
else if ("Open".equals(actionCommand))
open();
Point tempLineStart = new Point(0, 0);
Point tempLineDraw = new Point(0, 0);
Vector tempPointsVector = new Vector();
PrintWriter pw = null;
File myFile = new File("myfile.dat");
private void open()
public void start(){
// ScribblePanel class for scribbling using the mouse
class ScribblePanel extends JPanel implements MouseListener, MouseMotionListener{
// Circle diameter used for erasing
final int CIRCLESIZE = 20;
// Declaring and creating Point objects
private Point lineStart = new Point(0, 0);
private Point lineDraw = new Point(0, 0);
// Create a Graphics object for drawing
private Graphics g;
// Declaring and creating vectors to hold points
public static Vector pointsVector;
public static Vector mainVector = new Vector();
// Default constructor
public ScribblePanel()
// Register listeners for the mouse event
addMouseListener(this);
addMouseMotionListener(this);
public void mouseClicked(MouseEvent e){
public void mouseEntered(MouseEvent e){
public void mouseExited(MouseEvent e){
public void mouseReleased(MouseEvent e){
// Add vectors to main vector
mainVector.addElement(pointsVector);
public void mousePressed(MouseEvent e){
// Create pointsVector vector
pointsVector = new Vector();
// Show first point in JTextField object
ScribbleAndSave.jtxField.setText("("+e.getX() + ", " + e.getY()+ ")");
// Move first point to lineStart object
lineStart.move(e.getX(), e.getY());
public void mouseDragged(MouseEvent e){
// Get graphics context
g = getGraphics();
// Detect right button pressed
if (e.isMetaDown()){
// Erase the drawing using an oval
g.setColor(getBackground());
g.fillOval(e.getX() - (CIRCLESIZE/2), e.getY() - (CIRCLESIZE/2), CIRCLESIZE, CIRCLESIZE);
else {
// Do scribbling
g.setColor(Color.black);
g.drawLine(lineStart.x, lineStart.y, e.getX(), e.getY());
// Save successive points in vector objects
pointsVector.addElement(new Point(lineStart.x, lineStart.y));
pointsVector.addElement(new Point(e.getX(), e.getY()));
// Show successive points in JTextField object
ScribbleAndSave.jtxField.setText("("+e.getX()+", " + e.getY()+")");
// Dispose this graphics context
g.dispose();
// Move successive points to lineStart object to be used as starting points
lineStart.move(e.getX(), e.getY());
public void paintComponent(Graphics g){
// Reproduce scribbling
g.setColor(Color.blue);
for (int i=0; i<mainVector.size(); i++){
pointsVector =(Vector)mainVector.elementAt(i);
for (int j = 1; j<pointsVector.size(); j++){
lineStart = (Point)pointsVector.elementAt(j-1);
lineDraw = (Point)pointsVector.elementAt(j);
g.drawLine(lineStart.x, lineStart.y, lineDraw.x, lineDraw.y);
// Dispose the graphics context
g.dispose();
public void mouseMoved(MouseEvent e){
}Check ScribblePanel.mainVector.size() it is always
zeroJust by curiosity I double checked, but that was not so, SciribblePanel.mainVector.size() was not always. Should you attempt to run the program do a system.out.print() check and would realize that. Also understand the goal of the program is to create a file and collect in it the coordinates scribbled on the panel. The program accomplishes all steps except printing in the file. Please help!! -
Please help understand this error...
I am developing a small Hash Calculator that calculates MD5/ SHA Hash.
It has 2 modes,
1. Text mode in which i have a JTextField - userText where i can enter the text and then when i click on calculate the corresponding hash of the text is evaluated.
2. File mode in which then the JTextField gets disabled (locked or non editable) and i have button that gets visible through which i can then select a file (through JFileChooser) and when i select a file, i put it's absolute path in the JTextField - userText. and then when i click on calculate this code is run...
FileInputStream in=new FileInputStream(userText.getText());
int length=0;
while((length=in.read(buffer))!=-1)
md5.update(buffer,0,length);
digest=md5.digest();
hex="";
for (int i = 0; i < digest.length; i++)
int b = digest[i] & 0xff;
if (Integer.toHexString(b).length() == 1) hex = hex + "0";
hex = hex + Integer.toHexString(b);
hash.setText(algorithm.getSelectedItem().toString()+" Hash: "+hex);
copyString(hex);
status.setText(algorithm.getSelectedItem().toString()+" Hash copied to ClipBoard",Color.RED);
in.close();Now what i am getting is that in case i calculate a hash of a text (default starting mode is text mode) and then change the mode to File then it is working absolutely fine, but if right in the beginning, at the starting i go and select the File Mode, then when i click on calculate i get a strange error.
I have the stack trace of it :
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.io.FileInputStream.read(Unknown Source)
at MD5HashCalculator.calculate(MD5HashCalculator.java:371)
at MD5HashCalculator.access$3(MD5HashCalculator.java:338)
at MD5HashCalculator$12.actionPerformed(MD5HashCalculator.java:280)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)This weird thing is happening only the first time and it is happening in the line of the while loop basically
while((length=in.read(buffer))!=-1)I am unable to understand the error, please help.
What exactly is happening , and more specifically , why is it happening only if i did the mode change right in the beginning for the first time...??this buffer since it had a null value was giving the
error. I replaced the thing by
byte buffer[]="".getBytes();
I'm not sure that's the best thing to do.
I was reluctant at first to initialise the buffer
with some bytes as i thought it might effect the md5
value if it had some value in the beginning, You're supposed to create an empty byte array, e.g. like so:
byte[] buffer = new byte[1024];In this case, the read method will read at most 1024 bytes into the buffer. The number of bytes it actually reads is returned to you. If it returns 12, say, you should only use the 12 first bytes in the array since those are the bytes that were actually read in. Whatever was in those 12 slots in the array before you called read is overwritten. Then you call read again to see if there are more bytes available, until it returns -1 to signal that there is nothing more to read.
but i
have re-checked it accurately, the code is now
working fine and the MD5 has is coming perfectly.
This seems strange, as
"".getBytes();returns a byte array of zero length, which to me suggests you would end up in an infinite loop. But if you say so... -
Client server code with errors could some one please help me!!!
I am using a random access file to design the two interfaces for my client and my server is this the right thing to do? Oh could some one give me some example code of client server interfaces.
I got an error in the code for the interfaces and I don't know what it is could some one please help me!!
Heres the error in the code: This is for RegisterCustomer
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
class RegisterCustomer extends JPanel implements ActionListener
// Button for registering a customer
private JButton jbtRegister;
// Customer information panel
private CustomerPanel customerPanel; (The error is on this line and it says Field type customer panel is missing)
// Random access file
private RandomAccessFile raf;
Second error: Its in the ViewCustomer:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
// View customer panel
class ViewCustomer extends JPanel implements ActionListener
// Buttons for viewing customer information
private JButton jbtFirst, jbtNext, jbtPrevious, jbtLast;
// Random access file
private RandomAccessFile raf = null;
// Current customer record
private Customer customer = new Customer();
// Create a customer panel
private CustomerPanel customerPanel = new customerPanel(); (its on this line and it says field type CustomerPanel is missing)
// File pointer in the random access file
private long lastPos;
private long currentPos;
Heres the code for the customerPanel:
// Customer Panel.java: Panel for displaying Customer information
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
public class customerPanel extends JPanel
JTextField jtfRegistrationnumber = new JTextField(30);
JTextField jtfSeatingcapacity = new JTextField(20);
JTextField jtfStartdateofhire = new JTextField(20);
JTextField jtfDurationofhire = new JTextField(10);
JTextField jtfManufacture = new JTextField(20);
JTextField jtfModel = new JTextField(15);
JTextField jtfEnginesize = new JTextField(15);
JTextField jtfCharge = new JTextField(20);
JTextField jtfMileage = new JTextField(10);
// Constuct a customer panel
public customerPanel()
// Set the panel with line border
setBorder(new BevelBorder(BevelBorder.RAISED));
// Panel p1 for holding all the labels
JPanel p1 = new JPanel();
p1.setLayout(new GridLayout(3, 1));
p1.add(new JLabel("Registration number"));
p1.add(new JLabel("Seating capacity"));
p1.add(new JLabel("Start date of hire"));
p1.add(new JLabel("Duration of hire"));
p1.add(new JLabel("Manufacture"));
p1.add(new JLabel("Model"));
p1.add(new JLabel("Engine size"));
p1.add(new JLabel("Charge"));
p1.add(new JLabel("Mileage"));
// Panel jpRegistration number for registration number
JPanel jpRegistrationnumber = new JPanel();
jpRegistrationnumber.setLayout(new BorderLayout());
jpRegistrationnumber.add(new JLabel("Registration number"), BorderLayout.WEST);
jpRegistrationnumber.add(jtfRegistrationnumber, BorderLayout.CENTER);
// Panel jpSeating capacity for holding Seating capacity
JPanel jpSeatingcapacity = new JPanel();
jpSeatingcapacity.setLayout(new BorderLayout());
jpSeatingcapacity.add(new JLabel("Seating capacity"), BorderLayout.WEST);
jpSeatingcapacity.add(jtfSeatingcapacity, BorderLayout.CENTER);
// Panel jpStart date of hire for holding start date of hire
JPanel jpStartdateofhire = new JPanel();
jpStartdateofhire.setLayout(new BorderLayout());
jpStartdateofhire.add(new JLabel("Start date of hire"), BorderLayout.WEST);
jpStartdateofhire.add(jtfStartdateofhire, BorderLayout.CENTER);
// Panel jpDuration of hire for holding Duration of hire
JPanel jpDurationofhire = new JPanel();
jpDurationofhire.setLayout(new BorderLayout());
jpDurationofhire.add(new JLabel("Duration of hire"), BorderLayout.WEST);
jpDurationofhire.add(jtfDurationofhire, BorderLayout.CENTER);
// Panel p2 for holding jpRegistration number and jpSeating capacity and start date of hire and duration of hire
JPanel p2 = new JPanel();
p2.setLayout(new BorderLayout());
p2.add(jpRegistrationnumber, BorderLayout.WEST);
p2.add(jpSeatingcapacity, BorderLayout.CENTER);
p2.add(jpStartdateofhire, BorderLayout.CENTER);
p2.add(jpDurationofhire, BorderLayout.CENTER);
// Panel p3 for holding jtfManufacture and p2
JPanel p3 = new JPanel();
p3.setLayout(new BorderLayout());
p3.add(jtfManufacture, BorderLayout.CENTER);
p3.add(p2, BorderLayout.EAST);
// Panel p4 for holding jtfModel, jtfEngine size, charge and mileage and p3
JPanel p4 = new JPanel();
p4.setLayout(new GridLayout(3, 1));
p4.add(jtfModel);
p4.add(jtfEnginesize);
p4.add(jtfCharge);
p4.add(jtfMileage);
p4.add(p3);
// Place p1 and p4 into customerPanel
setLayout(new BorderLayout());
add(p1, BorderLayout.WEST);
add(p4, BorderLayout.CENTER);
// Get customer information from the text fields
public Customer getCustomer()
return new Customer(jtfRegistrationnumber.getText().trim(),
jtfSeatingcapacity.getText().trim(),
jtfStartdateofhire.getText().trim(),
jtfDurationofhire.getText().trim(),
jtfManufacture.getText().trim(),
jtfModel.getText().trim(),
jtfEnginesize.getText().trim(),
jtfCharge.getText().trim(),
jtfMileage.getText().trim());
// Set customer information on the text fields
public void setCustomer(Customer s)
jtfRegistrationnumber.setText(s.getRegistrationnumber());
jtfSeatingcapacity.setText(s.getSeatingcapacity());
jtfStartdateofhire.setText(s.getStartdateofhire());
jtfDurationofhire.setText(s.getDurationofhire());
jtfManufacture.setText(s.getManufacture());
jtfModel.setText(s.getModel());
jtfEnginesize.setText(s.getEnginesize());
jtfCharge.setText(s.getCharge());
jtfMileage.setText(s.getMileage());
Could someone please help me and tell me what these two errors mean and how I could get rid of themCan some one take a look at this code and tell me how to get all my jlabels to line up alone side their jtf.
Because it looks like this the picture in the attached file and this is the code for it:
public customerPanel()
// Set the panel with line border
setBorder(new BevelBorder(BevelBorder.RAISED));
// Panel p1 for holding labels Name, Street, and City
JPanel p1 = new JPanel();
p1.setLayout(new GridLayout(5, 1));
p1.add(new JLabel("Registration Number:"));
p1.add(new JLabel("Seating Capacity:"));
p1.add(new JLabel("Engine Size:"));
p1.add(new JLabel("Start date of hire"));
p1.add(new JLabel("Duration of hire"));
JPanel p2 = new JPanel();
p2.setLayout(new GridLayout(5, 1));
p2.add(jtfRegistrationnumber);
p2.add(jtfSeatingcapacity);
p2.add(jtfEnginesize);
p2.add(jtfStartdateofhire);
p2.add(jtfDurationofhire);
//JPanel p3 = new JPanel();
//p3.add(p1, BorderLayout.WEST);
//p3.add(p2, BorderLayout.NORTH);
JPanel p4 = new JPanel();
p4.setLayout(new GridLayout(4, 1));
p4.add(new JLabel("Manufacture:"));
p4.add(new JLabel("Model:"));
p4.add(new JLabel("Mileage:"));
p4.add(new JLabel("Charge:"));
JPanel p5 = new JPanel();
p5.setLayout(new GridLayout(4, 1));
p5.add(jtfManufacture);
p5.add(jtfModel);
p5.add(jtfMileage);
p5.add(jtfCharge);
// JPanel p6 = new JPanel();
// p6.setLayout(new BorderLayout());
// p6.add(p4, BorderLayout.SOUTH);
// p6.add(p5, BorderLayout.EAST);
// Place p1 and p4 into CustomerPanel
setLayout(new BorderLayout());
add(p1, BorderLayout.WEST);
add(p2, BorderLayout.NORTH);
add(p4, BorderLayout.SOUTH);
add(p5, BorderLayout.EAST);
So could someone please help me and correct my code so that each text lable is lined up next to its jtf java text field.
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