JOptionPane glitches - need help!
Hi,
I am building a java application that is full-screen. It is not set to always be on top. What happens is that the user is supposed to drag one of the green shapes onto the board. If they drag the shape and let go slowly, the JOptionPane shows up correctly. If they drag the shape and let go fast while they are dragging it, it causes problems with the display of the JOptionPane dialog. Below are some screen-shots of the problem:
[http://www.thedigitallion.com/temp/ex1.jpg]
[http://www.thedigitallion.com/temp/ex2.jpg]
The JOptionPane shows up on mouse button release because that is how I test for when they stop dragging it. It seems like it still animates the shape after the joptionpane comes up and that is why it doesn't refresh the screen afterward. Here is a code snippet:
[http://www.thedigitallion.com/temp/code.txt]
Any help would be greatly appreciated!!!
Ryan
Point A
JOptionPane.showInputDialog(....);
Point BA modal dialog serves two purposes. One is that it dosen't allow you to get to Point B until the dialog is closed. You are using this property in your code to get input and then handle the input only after the dialog is closed. The second purpose of a modal dialog is to cut off functionality to the parent frame. If I try to click on the parent frame then Windows will make a "beep" sound and the dialog's window decorations will flash. I have to handle the dialog before I can start working with the frame again.
This would seemingly pose a problem though if the modal dialog is shown on the EDT (short for Event Dispatch Thread). The EDT is the thread that handle's all your GUI events (painting, key input, mouse input, focus changes, component resizes ... bascially anything and everything that extends java.awt.AWTEvent ). It's a simple matter of fact that if you hold up the EDT, then the GUI becomes unresponsive - to everything - until the EDT is ... no longer held up.
As I mentioned, because one of the purpose of a modal dialog is to keep the thread that made the dialog visible from continuing on (until the dialog is closed) then it would be in theory very bad to call JOptionPane.showXXX on the EDT as this would deadlock the program. Fortunately though, the java developers were kind enough to forsee this problem and implemented it so that a new temporary thread is created to handle the GUI stuff if a modal dialog is shown on the EDT.
The bad news is that we can't really mimick this functionality on our own.
Would I have to manually go through all of my components on the screen disabling them whenever I want to show a dialog if I did it this way or can I just block input to anything below the layer that the dialog in on?It could be as easy as making a component visible (like the glass pane) or as easy as calling a single method (when your content pane is wrapped within a JXLayer). You may not even need this functionality.
I'm simply stating that the hard part is to design your code so that Point B no longer directly comes after showing the input prompt.
Point A
JOptionPane.showInputDialog(....);
Point BThis can only be achieved by placing the input handling stuff (Point B) in a seperate method. One which is called by the component receiving input in a layer above the content pane.
The JXLayer and the glass pane thing were simply to cut off functionality to the parent frame (the second purpose of a modal dialog).
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cache Startup\ items Admin\ access Root\ access Bundles dylibs Apps Font\ issues Inserted\ dylibs Firewall Proxies DNS TCP/IP Wi-Fi Profiles Root\ crontab User\ crontab 'Global login items' 'User login items' Spotlight Memory Listeners Widgets Parental\ Controls Prefetching SATA Descriptors appexes );N3=${#l[@]};for i in 0 1 2;do l[N3+i]=${p[5+i]};done;N4=${#l[@]};for j in 0 1;do l[N4+j]="Current ${p[29+j]}stream data";done;A0() { id -G|grep -qw 80;v[1]=$?;((v[1]==0))&&sudo true;v[2]=$?;v[3]=`date +%s`;clear >&-;date '+Start time: %T %D%n';};for i in 0 1;do eval ' A'$((1+i))'() { v=` eval "${c1[$1]} ${c2[$2]}"|'${c1[30+i]}' "${s[$3]}" `;[[ "$v" ]];};A'$((3+i))'() { v=` while read i;do [[ "$i" ]]&&eval "${c1[$1]} ${c2[$2]}" \"$i\"|'${c1[30+i]}' "${s[$3]}";done<<<"${v[$4]}" `;[[ "$v" ]];};A'$((5+i))'() { v=` while read i;do '${c1[30+i]}' "${s[$1]}" "$i";done<<<"${v[$2]}" `;[[ "$v" ]];};';done;A7(){ v=$((`date +%s`-v[3]));};B2(){ v[$1]="$v";};for i in 0 1;do eval ' B'$i'() { v=;((v['$((i+1))']==0))||{ v=No;false;};};B'$((3+i))'() { v[$2]=`'${c1[30+i]}' "${s[$3]}"<<<"${v[$1]}"`;} ';done;B5(){ v[$1]="${v[$1]}"$'\n'"${v[$2]}";};B6() { v=` paste -d: <(printf "${v[$1]}") <(printf "${v[$2]}")|awk -F: ' {printf("'"${f[$3]}"'",$1,$2)} ' `;};B7(){ v=`grep -Fv "${v[$1]}"<<<"$v"`;};C0() { [[ "$v" ]]&&sed -E "$s"<<<"$v";};C1() { [[ "$v" ]]&&printf "${f[$1]}" "${l[$2]}" "$v"|sed -E "$s";};C2() { v=`echo $v`;[[ "$v" != 0 ]]&&C1 0 $1;};C3() { v=`sed -E "${s[63]}"<<<"$v"`&&C1 1 $1;};for i in 1 2;do for j in 0 2 3;do eval D$i$j'(){ A'$i' $1 $2 $3; C'$j' $4;};';done;done;{ A0;D20 0 $((N1+1)) 2;D10 0 $N1 1;B0;C2 27;B0&&! B1&&C2 28;D12 15 37 25 8;A1 0 $((N1+2)) 3;C0;D13 0 $((N1+3)) 4 3;D23 0 $((N1+4)) 5 4;D13 0 $((N1+9)) 59 50;for i in 0 1 2;do D13 0 $((N1+5+i)) 6 $((N3+i));done;D13 1 10 7 9;D13 1 11 8 10;D22 2 12 9 11;D12 3 13 10 12;D23 4 19 44 13;D23 5 14 12 14;D22 6 36 13 15;D22 7 37 14 16;D23 8 15 38 17;D22 9 16 16 18;B1&&{ D22 35 49 61 51;D22 11 17 17 20;for i in 0 1;do D22 28 $((N2+i)) 45 $((N4+i));done;};D22 12 44 54 45;D22 12 39 15 21;A1 13 40 18;B2 4;B3 4 0 19;A3 14 6 32 0;B4 0 5 11;A1 17 41 20;B7 5;C3 22;B4 4 6 21;A3 14 7 32 6;B4 0 7 11;B3 4 0 22;A3 14 6 32 0;B4 0 8 11;B5 7 8;B1&&{ A2 19 26 23;B7 7;C3 23;};A2 18 26 23;B7 7;C3 24;D13 4 21 24 26;B4 4 12 26;B3 4 13 27;A1 4 22 29;B7 12;B2 14;A4 14 6 52 14;B2 15;B6 14 15 4;B3 0 0 30;C3 29;A1 4 23 27;B7 13;C3 30;B3 4 0 65;A3 14 6 32 0;B4 0 16 11;A1 4 50 64;B7 16;C3 52;D13 24 24 32 31;D13 25 37 32 33;A2 23 18 28;B2 16;A2 16 25 33;B7 16;B3 0 0 34;B2 21;A6 47 21&&C0;B1&&{ D13 21 0 32 19;D13 10 42 32 40;D22 29 35 46 39;};D23 14 1 62 42;D12 34 43 53 44;D12 22 20 32 25;D22 0 $((N1+8)) 51 32;D13 4 8 41 6;D12 26 28 35 34;D13 27 29 36 35;A2 27 32 39&&{ B2 19;A2 33 33 40;B2 20;B6 19 20 3;};C2 36;D23 33 34 42 37;B1&&D23 35 45 55 46;D23 32 31 43 38;D12 36 47 32 48;D13 20 42 32 41;D13 37 2 48 43;D13 4 5 32 1;D13 4 3 60 5;D12 26 48 49 49;B3 4 22 57;A1 26 46 56;B7 22;B3 0 0 58;C3 47;D22 4 4 50 0;D23 22 9 37 7;A7;C2 2;} 2>/dev/null|pbcopy;exit 2>&-
Copy the selected text to the Clipboard by pressing the key combination command-C.
8. Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Click anywhere in the Terminal window and paste by pressing command-V. The text you pasted should vanish immediately. If it doesn't, press the return key.
9. If you see an error message in the Terminal window such as "Syntax error" or "Event not found," enter
exec bash
and press return. Then paste the script again.
10. If you're logged in as an administrator, you'll be prompted for your login password. Nothing will be displayed when you type it. You will not see the usual dots in place of typed characters. Make sure caps lock is off. Type carefully and then press return. You may get a one-time warning to be careful. If you make three failed attempts to enter the password, the test will run anyway, but it will produce less information. In most cases, the difference is not important. If you don't know the password, or if you prefer not to enter it, press the key combination control-C or just press return three times at the password prompt. Again, the script will still run.
If you're not logged in as an administrator, you won't be prompted for a password. The test will still run. It just won't do anything that requires administrator privileges.
11. The test may take a few minutes to run, depending on how many files you have and the speed of the computer. A computer that's abnormally slow may take longer to run the test. While it's running, there will be nothing in the Terminal window and no indication of progress. Wait for the line
[Process completed]
to appear. If you don't see it within half an hour or so, the test probably won't complete in a reasonable time. In that case, close the Terminal window and report what happened. No harm will be done.
12. When the test is complete, quit Terminal. The results will have been copied to the Clipboard automatically. They are not shown in the Terminal window. Please don't copy anything from there. All you have to do is start a reply to this comment and then paste by pressing command-V again.
At the top of the results, there will be a line that begins with the words "Start time." If you don't see that, but instead see a mass of gibberish, you didn't wait for the "Process completed" message to appear in the Terminal window. Please wait for it and try again.
If any private information, such as your name or email address, appears in the results, anonymize it before posting. Usually that won't be necessary.
13. When you post the results, you might see an error message on the web page: "You have included content in your post that is not permitted," or "You are not authorized to post." That's a bug in the forum software. Please post the test results on Pastebin, then post a link here to the page you created.
14. This is a public forum, and others may give you advice based on the results of the test. They speak only for themselves, and I don't necessarily agree with them.
Copyright © 2014 by Linc Davis. As the sole author of this work, I reserve all rights to it except as provided in the Use Agreement for the Apple Support Communities website ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed. -
Need Help with new site glitches PLEASE!!!
I need help trouble shooting a website. The site is
www.farrowandwatkins.com. Nav buttons on Mac they display correctly
which is aligned at top and bottom of content to left on Home page.
However, when viewed on PC, the buttons spread to fill the
distance of the "Patients" Page. All the pages spread to this
length also, but are not suppose to.
Nav buttons have padding of 10 on bottom, except last one.
Please help if you canFirst guess would be that there doesn't seem to be a fixed
height or width on the cell for the 'patients' button. -
Need help in creating a java program
Hi everyone.
I'd like to say before i start about my problem, that i've only begun learning java and my teacher hasn't explained anything at all. He only showed us by doing it himself and then showing us the final version. I've searched a little on how to program but i get little success in finding a good tutorial.
I need help creating a program which has been assigned to me due in a few days in which i can't contact my teacher for help.
I need to write a java program which inputs 3 items. The number of kilometres you drove, the number of litres of gas you used and the price you paid for the gas. Then, the program must calculate the number of litres used per 100km driven, which is litres divided by kilometres times 100, how much it costs to drive 100km, which is the result (a) times the price per litre and the number of miles per American gallon of gas ( one American gallon = 3.785 litres, and one mile = 1.609 km.
The program has to output my name, the inputs given, the results computed and a message saying "Program Complete".
To give you what i've done to begin with, from what i understood, is:
import javax.swing.JOptionPane;
public class prog1
public static void main(String args[])
final double americanGallon = 3.785;
final double mile = 1.609;
kilometresDriven,
gasUsed;
priceOfLiterGas;
System.out.println("My Name");
System.out.println("Number of kilometres driven:");
kilometresDriven = JOptionPane.showInputDialog ("Kilometres Driven");
System.out.println("Number of Litres of gas used:");
gasUsed = JOptionPane.showInputDialog ("Litres of gas used");
System.out.println("Price of a liter of gas:");
priceOfLiterGas = JoptionPane.showInputDialog("Price per liter");
Up to now, that's all i've got. i know i'm wrong, but i'm not sure how to do this. Could someone give me an outline of what this program is suppose to look like?
Thanks in advance.Here's an update on my program. I've worked on certain details and would need your comments whether it contains errors. I'd also want to know if it would work or not because i don't know how to check it on my computer.
Here's the update:
import javax.swing.JOptionPane;
public class Prog1
public static void main(String args[])
String name;
double kmDriven;
double litresUsed;
double pricePaidForGas;
double priceOfALiter;
name = JOptionPane.showInputDialog("Name");
input = JOptionPane.showInputDialog("Number of km driven");
kmDriven = Double.parseDouble (input);
input = JOptionPane.showInputDialog("Number of litres of gas used");
litresUsed = Double.parseDouble (input);
input = JOptionPane.showInputDialog("Price paid for gas");
pricePaidForGas = Double.parseDouble (input);
input = JOptionPane.showInputDialog("Price of a litre of gas");
priceOfALiter = Double.parseDouble (input);
a = (litresUsed/kmDriven)*100;
b = ((litresUsed/kmDriven)*100)*priceOfALiter);
c = (kmDriven/1.609)
System.out.println("Name:" + name);
System.out.println("Number of litres used per 100km:" + a);
System.out.println("Cost of driving 100km" + b);
System.out.println("Number of miles per American Gallon of Gas:" + c);
System.out.println("Program Complete");
System.exit(0);
Comments please.
Thanks in advance -
Need help with JTextArea and Scrolling
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import javax.swing.*;
public class MORT_RETRY extends JFrame implements ActionListener
private JPanel keypad;
private JPanel buttons;
private JTextField lcdLoanAmt;
private JTextField lcdInterestRate;
private JTextField lcdTerm;
private JTextField lcdMonthlyPmt;
private JTextArea displayArea;
private JButton CalculateBtn;
private JButton ClrBtn;
private JButton CloseBtn;
private JButton Amortize;
private JScrollPane scroll;
private DecimalFormat calcPattern = new DecimalFormat("$###,###.00");
private String[] rateTerm = {"", "7years @ 5.35%", "15years @ 5.5%", "30years @ 5.75%"};
private JComboBox rateTermList;
double interest[] = {5.35, 5.5, 5.75};
int term[] = {7, 15, 30};
double balance, interestAmt, monthlyInterest, monthlyPayment, monPmtInt, monPmtPrin;
int termInMonths, month, termLoop, monthLoop;
public MORT_RETRY()
Container pane = getContentPane();
lcdLoanAmt = new JTextField();
lcdMonthlyPmt = new JTextField();
displayArea = new JTextArea();//DEFINE COMBOBOX AND SCROLL
rateTermList = new JComboBox(rateTerm);
scroll = new JScrollPane(displayArea);
scroll.setSize(600,170);
scroll.setLocation(150,270);//DEFINE BUTTONS
CalculateBtn = new JButton("Calculate");
ClrBtn = new JButton("Clear Fields");
CloseBtn = new JButton("Close");
Amortize = new JButton("Amortize");//DEFINE PANEL(S)
keypad = new JPanel();
buttons = new JPanel();//DEFINE KEYPAD PANEL LAYOUT
keypad.setLayout(new GridLayout( 4, 2, 5, 5));//SET CONTROLS ON KEYPAD PANEL
keypad.add(new JLabel("Loan Amount$ : "));
keypad.add(lcdLoanAmt);
keypad.add(new JLabel("Term of loan and Interest Rate: "));
keypad.add(rateTermList);
keypad.add(new JLabel("Monthly Payment : "));
keypad.add(lcdMonthlyPmt);
lcdMonthlyPmt.setEditable(false);
keypad.add(new JLabel("Amortize Table:"));
keypad.add(displayArea);
displayArea.setEditable(false);//DEFINE BUTTONS PANEL LAYOUT
buttons.setLayout(new GridLayout( 1, 3, 5, 5));//SET CONTROLS ON BUTTONS PANEL
buttons.add(CalculateBtn);
buttons.add(Amortize);
buttons.add(ClrBtn);
buttons.add(CloseBtn);//ADD ACTION LISTENER
CalculateBtn.addActionListener(this);
ClrBtn.addActionListener(this);
CloseBtn.addActionListener(this);
Amortize.addActionListener(this);
rateTermList.addActionListener(this);//ADD PANELS
pane.add(keypad, BorderLayout.NORTH);
pane.add(buttons, BorderLayout.SOUTH);
pane.add(scroll, BorderLayout.CENTER);
addWindowListener( new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
public void actionPerformed(ActionEvent e)
String arg = lcdLoanAmt.getText();
int combined = Integer.parseInt(arg);
if (e.getSource() == CalculateBtn)
try
JOptionPane.showMessageDialog(null, "Got try here", "Error", JOptionPane.ERROR_MESSAGE);
catch(NumberFormatException ev)
JOptionPane.showMessageDialog(null, "Got here", "Error", JOptionPane.ERROR_MESSAGE);
if ((e.getSource() == CalculateBtn) && (arg != null))
try{
if ((e.getSource() == CalculateBtn) && (rateTermList.getSelectedIndex() == 1))
monthlyInterest = interest[0] / (12 * 100);
termInMonths = term[0] * 12;
monthlyPayment = combined * (monthlyInterest / (1 - (Math.pow (1 + monthlyInterest, -termInMonths))));
lcdMonthlyPmt.setText(calcPattern.format(monthlyPayment));
if ((e.getSource() == CalculateBtn) && (rateTermList.getSelectedIndex() == 2))
monthlyInterest = interest[1] / (12 * 100);
termInMonths = term[1] * 12;
monthlyPayment = combined * (monthlyInterest / (1 - (Math.pow (1 + monthlyInterest, -termInMonths))));
lcdMonthlyPmt.setText(calcPattern.format(monthlyPayment));
if ((e.getSource() == CalculateBtn) && (rateTermList.getSelectedIndex() == 3))
monthlyInterest = interest[2] / (12 * 100);
termInMonths = term[2] * 12;
monthlyPayment = combined * (monthlyInterest / (1 - (Math.pow (1 + monthlyInterest, -termInMonths))));
lcdMonthlyPmt.setText(calcPattern.format(monthlyPayment));
catch(NumberFormatException ev)
JOptionPane.showMessageDialog(null, "Invalid Entry!\nPlease Try Again", "Error", JOptionPane.ERROR_MESSAGE);
} //IF STATEMENTS FOR AMORTIZATION
if ((e.getSource() == Amortize) && (rateTermList.getSelectedIndex() == 1))
loopy(7, 5.35);
if ((e.getSource() == Amortize) && (rateTermList.getSelectedIndex() == 2))
loopy(15, 5.5);
if ((e.getSource() == Amortize) && (rateTermList.getSelectedIndex() == 3))
loopy(30, 5.75);
if (e.getSource() == ClrBtn)
rateTermList.setSelectedIndex(0);
lcdLoanAmt.setText(null);
lcdMonthlyPmt.setText(null);
displayArea.setText(null);
if (e.getSource() == CloseBtn)
System.exit(0);
private void loopy(int lTerm,double lInterest)
double total, monthly, monthlyrate, monthint, monthprin, balance, lastint, paid;
int amount, months, termloop, monthloop;
String lcd2 = lcdLoanAmt.getText();
amount = Integer.parseInt(lcd2);
termloop = 1;
paid = 0.00;
monthlyrate = lInterest / (12 * 100);
months = lTerm * 12;
monthly = amount *(monthlyrate/(1-Math.pow(1+monthlyrate,-months)));
total = months * monthly;
balance = amount;
while (termloop <= lTerm)
displayArea.setCaretPosition(0);
displayArea.append("\n");
displayArea.append("Year " + termloop + " of " + lTerm + ": payments\n");
displayArea.append("\n");
displayArea.append("Month\tMonthly\tPrinciple\tInterest\tBalance\n");
monthloop = 1;
while (monthloop <= 12)
monthint = balance * monthlyrate;
monthprin = monthly - monthint;
balance -= monthprin;
paid += monthly;
displayArea.setCaretPosition(0);
displayArea.append(monthloop + "\t" + calcPattern.format(monthly) + "\t" + calcPattern.format(monthprin) + "\t");
displayArea.append(calcPattern.format(monthint) + "\t" + calcPattern.format(balance) + "\n");
monthloop ++;
termloop ++;
public static void main(String args[])
MORT_RETRY f = new MORT_RETRY();
f.setTitle("MORTGAGE PAYMENT CALCULATOR");
f.setBounds(600, 600, 500, 500);
f.setLocationRelativeTo(null);
f.setVisible(true);
}need help with displaying the textarea correctly and the scroll bar please.
Message was edited by:
new2this2020What's the problem you're having ???
PS. -
Hi. I'm making a DateTimePicker (DTP), and I need help on getting a method to return a Date only when the DTP is closed, and I want this to be done in the DTP class itself.
For now, I've used an infinite loop and it seems to work fine without lagging the computer (my computer is above average), but I'm not sure if there's another more efficient way.
I would prefer not to use threads, but if that's the only option then I suppose it's unavoidable.
I'm using:
while(true){
switch(returnState){
case UNINITIALIZED: continue;
case SET: return cal.getTime();
case CANCELED:
default:
return null;
}Screenshots:
http://i34.tinypic.com/53rb7n.png
http://i33.tinypic.com/2nsxct4.png
Azriel~You could put any component in a JOptionPane or a JDialog and then easily query the component for results once it has returned.
For example:
QueryComponent.java creates a component that can be placed in a JOptionPane and then queried.
import java.awt.GridLayout;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JComponent;
import javax.swing.JTextField;
* A simple component that has two JTextFields and two
* corresponding "getter" methods to extract information
* out of the JTextFields.
* @author Pete
public class QueryComponent
private JPanel mainPanel = new JPanel();
private JTextField firstNameField = new JTextField(8);
private JTextField lastNameField = new JTextField(8);
public QueryComponent()
mainPanel.setLayout(new GridLayout(2, 2, 5, 5));
mainPanel.add(new JLabel("First Name: "));
mainPanel.add(firstNameField);
mainPanel.add(new JLabel("Last Name: "));
mainPanel.add(lastNameField);
public String getFirstName()
return firstNameField.getText();
public String getLastName()
return lastNameField.getText();
// get the mainPanel to place into a JOptionPane
public JComponent getComponent()
return mainPanel;
}QueryComponentTest.java places the component above into a JOptionPane, shows the pane, and then queries the QueryComponent object for the results.
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JComponent;
public class QueryComponentTest
private JPanel mainPanel = new JPanel();
public QueryComponentTest()
JButton getNamesBtn = new JButton("Get Names");
getNamesBtn.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
getNamesAction();
mainPanel.add(getNamesBtn);
// occurs when button is pressed
private void getNamesAction()
// create object to place into JOptionPane
QueryComponent queryComp = new QueryComponent();
// show JOptionPane
int result = JOptionPane.showConfirmDialog(mainPanel,
queryComp.getComponent(), // place the component into the JOptionPane
"Get Names",
JOptionPane.INFORMATION_MESSAGE);
if (result == JOptionPane.OK_OPTION) // if ok selected
// query the queryComp for its contents by calling its getters
System.out.println("First Name: " + queryComp.getFirstName());
System.out.println("Last Name: " + queryComp.getLastName());
public JComponent getComponent()
return mainPanel;
private static void createAndShowUI()
JFrame frame = new JFrame("QueryComponentTest");
frame.getContentPane().add(new QueryComponentTest().getComponent());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
public static void main(String[] args)
java.awt.EventQueue.invokeLater(new Runnable()
public void run()
createAndShowUI();
}Edited by: Encephalopathic on Sep 29, 2008 8:16 PM -
Im a newbie in java and i need help. im a student
im an I.T student in Adamson University here in the philippines i went here to ask help about our activity in school about java. our professor told us to make a program in java (btw were using netbeans) that will ask the user his birth year and then the output will tell the zodiac sign of the year entered. she told us (our prof) to make it using showInputDialog. and then to show the output we must use the JOptionPane.showMessageDialog.
i try to do it but i found myself in trouble bcoz im new in java.
i try to to it and here's what i did
import javax.swing.JOptionPane;
public class Zodiac;
public static void main(String args[])
String name=JOptionPane.showInputDialog("Enter your year of birth?");
String message=String.format("Your zodiac sign is tiger");
JOptionPane.showMessageDialog(null,message);
i knew that i need to use conditional statements here but i dont know where to put it and how to declare the JOptionPane.etc.
pls help me asap im a newbie.as you wish heres what i did. this is not a gui version
* To change this template, choose Tools | Templates
* and open the template in the editor.
package marlonestipona;
* @author ESTIPONA
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int yr1;
String tgr ="Tiger";
String dog ="Dog";
String rbt ="Rabbit";
String ox ="Ox";
String drgn ="Dragon";
String rat ="Rat";
String pig ="Pig";
String rst ="Rooster";
String hrs ="Horse";
String shp ="Sheep";
String mky ="Monkey";
String snk ="Snake";
System.out.print("Enter your birth year: ");
yr1=input.nextInt();
if (yr1==1974 || yr1==1986 || yr1==1998)
System.out.printf("Your zodiac sign is %s!\n",tgr);
}else if (yr1==1982 || yr1==1994 || yr1==2006){
System.out.printf("Your zodiac sign is %s!\n",dog);
}else if (yr1==1975 || yr1==1987 || yr1==1999){
System.out.printf("Your zodiac sign is %s!\n",rbt);
}else if (yr1==1973 || yr1==1985 || yr1==1997){
System.out.printf("Your zodiac sign is %s!\n",ox);
}else if (yr1==1976 || yr1==1988 || yr1==2000){
System.out.printf("Your zodiac sign is %s!\n",drgn);
}else if (yr1==1972 || yr1==1984 || yr1==1996){
System.out.printf("Your zodiac sign is %s!\n",rat);
}else if (yr1==1983 || yr1==1995 || yr1==2007){
System.out.printf("Your zodiac sign is %s!\n",pig);
}else if (yr1==1981 || yr1==1993 || yr1==2005){
System.out.printf("Your zodiac sign is %s!\n",rst);
}else if (yr1==1978 || yr1==1990 || yr1==2000){
System.out.printf("Your zodiac sign is %s!\n",hrs);
}else if (yr1==1971 || yr1==1991 || yr1==2003){
System.out.printf("Your zodiac sign is %s!\n",shp);
}else if (yr1==1980 || yr1==1992 || yr1==2004){
System.out.printf("Your zodiac sign is %s!\n",mky);
}else if (yr1==1977 || yr1==1989 || yr1==2001){
System.out.printf("Your zodiac sign is %s!\n",snk);
} else
System.out.println("Invalid");
now my problem is how to turn this whole code into gui using those dialog boxes. -
Help, I am killing myself trying to do this and I need help ASAP
I need help with this program it has to act like a cash register. The user will input an items price and then their payment. It will tell you the change and then tell you what kinda of change to use, see example below:
Use JOptionPane to take inputs from the user and display the results.
Example:
If the user enters
Amount Due = 5.52 // First Input from the User
Amount Given = 10.00 // Second Input from the User
Calculate the Balance Due
Balance Amount = $ 4.48
and display the balance due in denomination as (The following four lines will be ONE Output to the user)
$1 bill = 4 (4.00)
Quarters = 1 (0.25)
Dimes = 2 (0.20)
Pennies = 3 (0.03)
This last part, where you display the change that will be given back, ie: how many quarters, dimes, nickels, pennies is the part I am having problems with.
Can some one help? Please pardon my coding abilities, I am still learning how to do this and would really appreciate any help you can with my program.
Thanks in advance.
import javax.swing.*;
import java.text.*;
public class CashReg
{ //Start
public static void main (String [] args)
{ //Start Main
int count = 0;
char c1 = 0;
String price = null;
String payment = null;
String change = null;
boolean correct = false;
while(!correct)
{ //Start Loop
price = JOptionPane.showInputDialog (null,"Enter the amount of the item for purchase");
if (price.length() < 1) //Loop
JOptionPane.showMessageDialog (null, "You did not enter a purchase amount, try again please.");//Error message
payment = JOptionPane.showInputDialog (null,"Enter your payment amount.");
if (payment.length() < 1) //Loop
JOptionPane.showMessageDialog (null, "You did not enter a payment amount, try again please.");//Error message
else
correct = true; //Boolean to confirm that there are enough characters
for (int i=0; i<price.length(); i++)
if (Character.isUpperCase(price.charAt(i)))
count++;
} //End loop
// response = price - payment;
JOptionPane.showMessageDialog (null, "You item costs "+price+" and you payed "+payment+" and your change will be "+change);
System.exit(0);
} //End Main
} //EndOK, thanks for your help, but I need some more. I have the program running and showing the amount of change that is going to be returned. But I don't know how to display the kind of change. AKA, quarters, dimes, nickels and pennies. I am a programming idot, my teacher is letting us twist in the wind. He is not explaining the concepts behind any of this. You are saying the word "logic" and I don't know what that means. This assigment is due Monday, I just need some help with the last part. How to show the change. I am just plain lost. please help.
import java.text.DecimalFormat;
import javax.swing.*;
import java.text.*;
public class CashReg
{ //Start
public static void main (String [] args)
{ //Start Main
int count = 0;
char c1 = 0;
String price = null;
String payment = null;
String change = null;
boolean correct = false;
while(!correct)
{ //Start Loop
price = JOptionPane.showInputDialog (null,"Enter the amount of the item for purchase");
if (price.length() < 1) //Loop
JOptionPane.showMessageDialog (null, "You did not enter a purchase amount, try again please.");//Error message
payment = JOptionPane.showInputDialog (null,"Enter your payment amount.");
if (payment.length() < 1) //Loop
JOptionPane.showMessageDialog (null, "You did not enter a payment amount, try again please.");//Error message
else
correct = true; //Boolean to confirm that there are enough characters
for (int i=0; i<price.length(); i++)
if (Character.isUpperCase(price.charAt(i)))
count++;
} //End loop
// response = price - payment;
float fPrice = Float.parseFloat(price);
float fPayment = Float.parseFloat(payment);
float fChange = fPayment-fPrice;
DecimalFormat df = new DecimalFormat ("#.00");
JOptionPane.showMessageDialog (null, "You item costs "+price+" and you payed "+payment+" and your change will be "+ df.format (fChange));
This is where I don't know what to put
System.exit(0);
} //End Main
} //End
I am begging for help. -
Warning this is very long code but i need help to see if I am on right trac
I have done all the following code myself and it is the buisiness layer for my application. I have tried to follow recommendations on previous posts and I would like to be told where I can clean up my code and how? This is not complete and it looks very long to me but I need help in order to be better. There are 4 button vlivks and I have not completed them all. The criteria for application is that phonebook will accept new entries if they have names surnames and phone numbers that are not longer than 10 characters for display purposes but can change this. No duplicates are allowed. No editing of a existing entry must lead to a duplicate entry either. No new entry or edit may result in a new contact having no phone numbers.
Many thanks for your time in advance,.....
import javax.swing.JOptionPane;
import java.util.ArrayList;
public class Contact
{// Start of the Contact class
ArrayList<ContactDetails> phoneList = new ArrayList<ContactDetails>(); // To hold all the contacts
ArrayList<ContactDetails> searchList = new ArrayList<ContactDetails>(); // To hold all contacts that return true on search
ArrayList<ContactDetails> list = new ArrayList<ContactDetails>();
String newName; // To hold the new name
String newSurname; // to hold the new surname
String newHome; // To hold the new home number if any
String newWork; // To hold the new work number
String newCell; // To hold the new cell number
final int MAX_LENGTH = 10;
public boolean addToPhoneList; // Sets to false if there is an invalid entry
public boolean addToSearchList; // Sets to false if there is an invlid search
public boolean modifyContact; // Sets to false if there is an invalid modification
// Method to create a new contact
public void createNew()
{// Start of create new()
addToPhoneList = true; // Set boolean to true each time the method is executed
getNewContactsName(); // Get new name
if(addToPhoneList == false)
createNew();
return;
getNewContactsSurname(); //Get new surname
if(addToPhoneList == false)
createNew();
return;
String checkName = newName; //Creates copies to be used in the checkIfDuplicate method
String checkSurname = newSurname;
addToPhoneList = checkIfDuplicate(checkName, checkSurname); //Check if the entries are duplicate
if(addToPhoneList == false)
createNew();
return;
getNewContactsHomeNum(); // Get new home number
if(addToPhoneList == false)
createNew();
return;
getNewContactsWorkNum(); // Get new work number
if(addToPhoneList == false)
createNew();
return;
getNewContactsCellNum(); // Get new cell number
if(addToPhoneList == false)
createNew();
return;
checkAtLeastOneNumEntered(); // Check that at least one phone number was entered
if(addToPhoneList == true)
updateListWithNew();
}// End of createNew()
// Method to search for an existing contact
public void searchExisting()
{// Start of searchExisting()
addToSearchList = true; // Set the boolean true
searchList.clear(); // Clear list from any previous searches
if(phoneList.size() > 0) // Check if any contacts are in the list
getExistingDetailsAndSearch(); // If there are entries then continue to search
else
JOptionPane.showMessageDialog(null,"There are no contacts to search for. Please use this option when you have added a contact to the list.","Error",JOptionPane.ERROR_MESSAGE);
}// End of searchExisting()
// Method to modify an existing contact
public void modifyExisting()
{// Start of modifyExisting()
modifyContact = true; // Set the boolean to true
if(phoneList.size() <= 0) // Check if the phonelist is not empty
JOptionPane.showMessageDialog(null,"There are no contacts to modify. Please use this option when there have been contacts added to the list.","Error",JOptionPane.ERROR_MESSAGE);
else
getExistingDetailsAndModify(); // If phonelist not emty continue to modify method
}// End of modifyExisting()
//Method to delete a contact from the list
public void deleteExisting()
//Method to get new contacts name
public void getNewContactsName()
newName = JOptionPane.showInputDialog("Please enter the new contacts name or press cancel to exit without saving.");
if(newName == null)
finish();
if(newName.trim().length()<=0)
JOptionPane.showMessageDialog(null,"You have not entered a name. Please try again.","Error",JOptionPane.ERROR_MESSAGE);
addToPhoneList = false;
return;
addToPhoneList = checkLengthValid(newName, "name");
//Method to get a new contacts surname
public void getNewContactsSurname()
newSurname = JOptionPane.showInputDialog("Please enter the new contacts surnname or press cancel to exit without saving.");
if(newSurname == null)
finish();
addToPhoneList = checkLengthValid(newSurname, "surname");
//Method to get a new contacts home number
public void getNewContactsHomeNum()
newHome = JOptionPane.showInputDialog("Please enter the new contacts home number or press cancel to exit without saving.");
if(newHome == null)
finish();
if(newHome.trim().length() > 0)
try
Long homeNum = Long.parseLong(newHome);
catch(Exception e)
JOptionPane.showMessageDialog(null,"You may only use numbers for a valid phone number. Please try again.","Error",JOptionPane.ERROR_MESSAGE);
addToPhoneList = false;
return;
addToPhoneList = checkLengthValid(newHome, "home number");
//Method to get a new contacst work number
public void getNewContactsWorkNum()
newWork = JOptionPane.showInputDialog("Please enter the new contacts work number or press cancel to exit without saving");
if(newWork == null)
finish();
if(newWork.trim().length()> 0)
try
Long workNum = Long.parseLong(newWork);
catch(Exception e)
JOptionPane.showMessageDialog(null,"You may only use numbers for a valid number. Please try again.","Error",JOptionPane.ERROR_MESSAGE);
addToPhoneList = false;
return;
addToPhoneList = checkLengthValid(newWork, "work number");
//Method to get a new contacts cell number
public void getNewContactsCellNum()
newCell = JOptionPane.showInputDialog("Please enter the new contacts cell number or press cancel to exit without saving");
if(newCell == null)
finish();
if(newCell.trim().length() > 0)
try
Long cellNum = Long.parseLong(newCell);
catch(Exception e)
JOptionPane.showMessageDialog(null,"You may only use numbers for a valid number. Please try again.","Error",JOptionPane.ERROR_MESSAGE);
addToPhoneList = false;
return;
addToPhoneList = checkLengthValid(newCell, "cell number");
//Method to get the details for an existing contact
public void getExistingDetailsAndSearch()
String existingName = getExistingName("search for");
if(existingName == null)
addToSearchList = false;
return;
if(existingName.length()<=0)
JOptionPane.showMessageDialog(null,"You have not entered a name please try again","Error",JOptionPane.ERROR_MESSAGE);
addToSearchList = false;
searchExisting();
String existingSurname = getExistingSurname();
if(existingSurname == null)
return;
if(addToSearchList == true)
searchAndAddIfFound(existingName, existingSurname);
//Method to get existing details and modify contact
public void getExistingDetailsAndModify()
String existingName = getExistingName("modify");
if(existingName == null)
modifyContact = false;
return;
if(existingName.length()<=0)
JOptionPane.showMessageDialog(null,"You have not entered a name please try again","Error",JOptionPane.ERROR_MESSAGE);
modifyContact = false;
modifyExisting();
String existingSurname = getExistingSurname();
if(existingSurname == null)
return;
if(modifyContact == true)
getContactBySearch(existingName.trim().toUpperCase(), existingSurname.trim().toUpperCase());
//Method to get the contact from list and modify details
public void getContactBySearch(String currentName, String currentSurname)
int count = 0;
int numFound = 0;
for(ContactDetails cd: phoneList)
cd = phoneList.get(count);
if((cd.name.equals(currentName))&&(cd.surname.equals(currentSurname)))
numFound ++;
changeDetails(cd);
count ++;
if(numFound <= 0)
JOptionPane.showMessageDialog(null,"No contacts matching the name and surname you entered found. Press the modify button to try again.","Information",JOptionPane.INFORMATION_MESSAGE);
//Method to get existing contacts name
public String getExistingName(String whatWasClicked)
String name = JOptionPane.showInputDialog("Please enter the contacts name that you wish to "+whatWasClicked);
return name;
//Method to get an existing contacts surname
public String getExistingSurname()
String surname = JOptionPane.showInputDialog("Please enter the contacts surname.");
return surname;
//Method to change the details of contact
public void changeDetails(ContactDetails conToChange)
String currentName = conToChange.name;
String currentSurname = conToChange.surname;
String currentHome = conToChange.home;
String currentWork = conToChange.work;
String currentCell = conToChange.cell;
String newNameForContact = getNewModName(currentName);
if(modifyContact == false)
modifyExisting();
return;
String newSurnameForContact = getNewModSurname(currentSurname);
if(modifyContact == false)
modifyExisting();
return;
String newHomeForContact = getNewModHome(currentHome);
if(modifyContact == false)
modifyExisting();
return;
String newWorkForContact = getNewModWork(currentWork);
if(modifyContact == false)
modifyExisting();
return;
String newCellForContact = getNewModCell(currentCell);
if(modifyContact == false)
modifyExisting();
return;
if(modifyContact == true)
conToChange.name = newNameForContact;
//Method to get the modified name
public String getNewModName(String currentName)
String newModifiedName = JOptionPane.showInputDialog("Please enter the new name for contact or press cancel to keep it as is.");
if(newModifiedName == null)
return currentName;
if(newModifiedName.trim().length() <= 0)
JOptionPane.showMessageDialog(null,"You may not replace the existing name with a blank name. Please try again.","Error",JOptionPane.ERROR_MESSAGE);
modifyContact = false;
return currentName;
modifyContact = checkLengthValid(newModifiedName, "modified name");
return newModifiedName;
//Method to get the modified surname
public String getNewModSurname(String currentSurname)
String newModifiedSurname = JOptionPane.showInputDialog("Please enter the new surname for the contact or press cancel to keep it as is.");
if(newModifiedSurname == null)
return currentSurname;
modifyContact = checkLengthValid(newModifiedSurname, "modified surname");
if(modifyContact == false)
JOptionPane.showMessageDialog(null,"Surname not changed.","Information",JOptionPane.INFORMATION_MESSAGE);
return currentSurname;
modifyContact = checkLengthValid(newModifiedSurname, "modified surname");
return newModifiedSurname;
//Method to search and update the list with a succesfull search
private void searchAndAddIfFound(String name, String surname)
int count = 0;
int numFound = 0;
for(ContactDetails cd: phoneList)
cd = phoneList.get(count);
if(cd.name.equals(name.trim().toUpperCase()))
numFound ++;
searchList.add(cd);
count ++;
if(numFound <= 0)
JOptionPane.showMessageDialog(null,"No contacts were found matching the dat you entered.","Information",JOptionPane.INFORMATION_MESSAGE);
else
list.clear();
list.addAll(searchList);
//Method that check all entries are a valid logical length
//Method is based on assumption that a normal name, surname, and phone numbers are not longer than 10 characters long.
//IF This method is changed please change the layout in the GUI as this is also set to fit with the layout that gives a neat //apperance
private boolean checkLengthValid(String detailEntered, String whatWasEntered)
boolean validLength = true;
if(detailEntered.trim().length() >= MAX_LENGTH)
JOptionPane.showMessageDialog(null,"The " +whatWasEntered+" you entered is too long. Please try again and use a "+whatWasEntered+" that is less than "+MAX_LENGTH+" characters long.","Error",JOptionPane.ERROR_MESSAGE);
validLength = false;
return validLength;
private void finish()
System.exit(0);
//Method to update the list with a new entry
private void updateListWithNew()
try
ContactDetails cd = new ContactDetails();
cd.name = newName.trim().toUpperCase();
cd.surname = newSurname.trim().toUpperCase();
cd.home = newHome.trim();
cd.work = newWork.trim();
cd.cell = newCell.trim();
phoneList.add(cd);
JOptionPane.showMessageDialog(null,"Contact succesfully entered. To save this change press exit to save or use the save option in the toolbar menu.","Information",JOptionPane.INFORMATION_MESSAGE);
catch(Exception e)
JOptionPane.showMessageDialog(null,"Failed to add contact to list. If problem persists please contact the software developer.","Error",JOptionPane.ERROR_MESSAGE);
list.clear();
list.addAll(phoneList);
//Method to check for duplicate
public boolean checkIfDuplicate(String nameToCheck, String surnameToCheck)
int count = 0;
boolean valid = true;
for(ContactDetails cd : phoneList)
cd = phoneList.get(count);
if(((nameToCheck.trim().toUpperCase()).equals(cd.name))&&((surnameToCheck.trim().toUpperCase()).equals(cd.surname)))
JOptionPane.showMessageDialog(null,"You may not enter a duplicate contact. Please try again and change the name and surname.","Error",JOptionPane.ERROR_MESSAGE);
valid = false;
break;
count ++;
return valid;
//Method to check that at least one phone number exists for contact
public void checkAtLeastOneNumEntered()
if((newHome.trim().length()<=0)&&(newWork.trim().length()<=0)&&(newCell.trim().length()<=0))
JOptionPane.showMessageDialog(null,"You have not entered any phone number at all. You must enter at least one phone number for a new contact.","Error",JOptionPane.ERROR_MESSAGE);
addToPhoneList = false;
//Method that returns the list to the GUI
public ArrayList<ContactDetails> getList()
return list;
}Should I start over from scratch? Can I get help with links to tutorials on following? How to create a java CRUD application (google not useful) and how to layer in java(google not useful)
This is my pres layer as is is this wrong too?
Filename: ContactsListInterface.java
Date: 16 March 2008
Programmer: Yucca Nel
Purpose: Provides a GUI for entering names and contact numbers into a telephone directory.
Also allows options for searching for a specific name and deleting of data from the record
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import java.io.*;
import java.util.*;
import java.text.*;
public class Phonebook1 extends JFrame implements ActionListener
{ //start of class
// construct fields, buttons, labels,text boxes, ArrayLists etc
JTextPane displayPane = new JTextPane();
JLabel listOfContacts = new JLabel("List Of Contacts"); // creates a label for the scrollpane
JButton createButton = new JButton("Create");
JButton searchButton = new JButton("Search");
JButton modifyButton = new JButton("Modify");
JButton deleteButton = new JButton("Delete");
Contact c = new Contact();
ArrayList<ContactDetails> contactList = c.getList();
// create an instance of the ContactsListInterface
public Phonebook1()
{ // start of cli()
super("Phonebook Interface");
} // end of cli()
public JMenuBar createMenuBar()
{ // start of the createMenuBar()
// construct and populate a menu bar
JMenuBar mnuBar = new JMenuBar(); // creates a menu bar
setJMenuBar(mnuBar);
JMenu mnuFile = new JMenu("File",true); // creates a file menu in the menu bar which is visible
mnuFile.setMnemonic(KeyEvent.VK_F);
mnuFile.setDisplayedMnemonicIndex(0);
mnuFile.setToolTipText("File Options");
mnuBar.add(mnuFile);
JMenuItem mnuFileExit = new JMenuItem("Save And Exit"); // creates an exit option in the file menu
mnuFileExit.setMnemonic(KeyEvent.VK_X);
mnuFileExit.setDisplayedMnemonicIndex(1);
mnuFileExit.setToolTipText("Close Application");
mnuFile.add(mnuFileExit);
mnuFileExit.setActionCommand("Exit");
mnuFileExit.addActionListener(this);
JMenu mnuEdit = new JMenu("Edit",true); // creates a menu for editing options
mnuEdit.setMnemonic(KeyEvent.VK_E);
mnuEdit.setDisplayedMnemonicIndex(0);
mnuEdit.setToolTipText("Edit Options");
mnuBar.add(mnuEdit);
JMenu mnuEditSort = new JMenu("Sort",true); // creates an option for sorting entries
mnuEditSort.setMnemonic(KeyEvent.VK_S);
mnuEditSort.setDisplayedMnemonicIndex(0);
mnuEdit.add(mnuEditSort);
JMenuItem mnuEditSortByName = new JMenuItem("Sort By Name"); // to sort entries by name
mnuEditSortByName.setMnemonic(KeyEvent.VK_N);
mnuEditSortByName.setDisplayedMnemonicIndex(8);
mnuEditSortByName.setToolTipText("Sort entries by first name");
mnuEditSortByName.setActionCommand("Name");
mnuEditSortByName.addActionListener(this);
mnuEditSort.add(mnuEditSortByName);
JMenuItem mnuEditSortBySurname = new JMenuItem("Sort By Surname"); // to sort entries by surname
mnuEditSortBySurname.setMnemonic(KeyEvent.VK_R);
mnuEditSortBySurname.setDisplayedMnemonicIndex(10);
mnuEditSortBySurname.setToolTipText("Sort entries by surname");
mnuEditSortBySurname.setActionCommand("Surname");
mnuEditSortBySurname.addActionListener(this);
mnuEditSort.add(mnuEditSortBySurname);
JMenu mnuHelp = new JMenu("Help",true); // creates a menu for help options
mnuHelp.setMnemonic(KeyEvent.VK_H);
mnuHelp.setDisplayedMnemonicIndex(0);
mnuHelp.setToolTipText("Help options");
mnuBar.add(mnuHelp);
JMenuItem mnuHelpHelp = new JMenuItem("Help"); // creates a help option for help topic
mnuHelpHelp.setMnemonic(KeyEvent.VK_P);
mnuHelpHelp.setDisplayedMnemonicIndex(3);
mnuHelpHelp.setToolTipText("Help Topic");
mnuHelpHelp.setActionCommand("Help");
mnuHelpHelp.addActionListener(this);
mnuHelp.add(mnuHelpHelp);
JMenuItem mnuHelpAbout = new JMenuItem("About"); // creates a about option for info about api
mnuHelpAbout.setMnemonic(KeyEvent.VK_T);
mnuHelpAbout.setDisplayedMnemonicIndex(4);
mnuHelpAbout.setToolTipText("About this program");
mnuHelpAbout.setActionCommand("About");
mnuHelpAbout.addActionListener(this);
mnuHelp.add(mnuHelpAbout);
return mnuBar;
} // end of the createMenuBar()
// create the content pane
public Container createContentPane()
{ // start of createContentPane()
//construct and populate panels and content pane
JPanel labelPanel = new JPanel(); // panel is only used to put the label for the textpane in
labelPanel.setLayout(new FlowLayout());
labelPanel.add(listOfContacts);
JPanel displayPanel = new JPanel();// panel is used to display all the contacts and thier numbers
setTabsAndStyles(displayPane);
displayPane = addTextToTextPane();
displayPane.setEditable(false);
JScrollPane scrollPane = new JScrollPane(displayPane);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); // pane is scrollable vertically
scrollPane.setWheelScrollingEnabled(true);// pane is scrollable by use of the mouse wheel
scrollPane.setPreferredSize(new Dimension(400,320));
displayPanel.add(scrollPane);
JPanel workPanel = new JPanel();// panel is used to enter, edit and delete data
workPanel.setLayout(new FlowLayout());
workPanel.add(createButton);
createButton.setToolTipText("Create a new entry");
createButton.addActionListener(this);
workPanel.add(searchButton);
searchButton.setToolTipText("Search for an entry by name number or surname");
searchButton.addActionListener(this);
workPanel.add(modifyButton);
modifyButton.setToolTipText("Modify an existing entry");
modifyButton.addActionListener(this);
workPanel.add(deleteButton);
deleteButton.setToolTipText("Delete an existing entry");
deleteButton.addActionListener(this);
labelPanel.setBackground(Color.red);
displayPanel.setBackground(Color.red);
workPanel.setBackground(Color.red);
// create container and set attributes
Container c = getContentPane();
c.setLayout(new BorderLayout(30,30));
c.add(labelPanel,BorderLayout.NORTH);
c.add(displayPanel,BorderLayout.CENTER);
c.add(workPanel,BorderLayout.SOUTH);
c.setBackground(Color.red);
// add a listener for the window closing and save
addWindowListener(
new WindowAdapter()
public void windowClosing(WindowEvent e)
int answer = JOptionPane.showConfirmDialog(null,"Are you sure you would like to save all changes and exit?","File submission",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION)
System.exit(0);
return c;
} // end of createContentPane()
protected void setTabsAndStyles(JTextPane displayPane)
{ // Start of setTabsAndStyles()
// set Font style
Style fontStyle = StyleContext.getDefaultStyleContext().getStyle(StyleContext.DEFAULT_STYLE);
Style regular = displayPane.addStyle("regular", fontStyle);
StyleConstants.setFontFamily(fontStyle, "SansSerif");
Style s = displayPane.addStyle("bold", regular);
StyleConstants.setBold(s,true);
} // End of setTabsAndStyles()
public JTextPane addTextToTextPane()
{ // start of addTextToTextPane()
int numberOfEntries = contactList.size();
int count = 0;
Document doc = displayPane.getDocument();
try
{ // start of tryblock
// clear previous text
doc.remove(0,doc.getLength());
// insert titles of columns
doc.insertString(0,"NAME\tSURNAME\tHOME NO\tWORK NO\tCELL NO\n",displayPane.getStyle("bold"));
for(ContactDetails cd : contactList)
cd = contactList.get(count);
doc.insertString(doc.getLength(),cd.name+"\t"+cd.surname+"\t"+cd.home+"\t"+cd.work+"\t"+cd.cell+"\n",displayPane.getStyle("regular"));
count ++;
} // end of try block
catch(BadLocationException ble)
{ // start of ble exception handler
System.err.println("Could not insert text.");
} // end of ble exception handler
return displayPane;
} // end of addTextToTextPane()
// code to process user clicks
public void actionPerformed(ActionEvent e)
{ // start of actionPerformed()
String arg = e.getActionCommand();
// user clicks create button
if(arg.equals("Create"))
c.createNew(); // method to create a new Contact
addTextToTextPane();
if(arg.equals("Search"))
c.searchExisting(); // method to search for an existing entry
addTextToTextPane();
if(arg.equals("Modify"))
c.modifyExisting(); // method to modify contact
addTextToTextPane();
if(arg.equals("Delete"))
c.deleteExisting();
addTextToTextPane();
if(arg.equals("Exit"))
} // end of actionPerformed()
// method to create a new contact
public static void main(String[] args)
{ // start of main()
// Set look and feel of interface
try
{ // start of try block
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} // end of try block
catch(Exception e)
{ // start of catch block
JOptionPane.showMessageDialog(null,"There was an error in setting the look and feel of this application","Error",JOptionPane.INFORMATION_MESSAGE);
} // end of catch block
Phonebook1 pb = new Phonebook1();
pb.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
pb.setJMenuBar(pb.createMenuBar());
pb.setContentPane(pb.createContentPane());
pb.setSize(520,500);
pb.setVisible(true);
pb.setResizable(false);
} // end of main()
} //end of class -
Hi all I'm working on a project and need help.
I want the "New" button to clear all the fields.
Any help?
=======================================================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Message extends JFrame implements ActionListener {
public Message() {
super("Write a Message - by Kieran Hannigan");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(370,270);
FlowLayout flo = new FlowLayout(FlowLayout.RIGHT);
setLayout(flo);
//Make the bar
JMenuBar bar = new JMenuBar();
//Make "File" on Menu
JMenu File = new JMenu("File");
JMenuItem f1 = new JMenuItem("New");
JMenuItem f2 = new JMenuItem("Open");
JMenuItem f3 = new JMenuItem("Save");
JMenuItem f4 = new JMenuItem("Save As");
JMenuItem f5 = new JMenuItem("Exit");
File.add(f1);
File.add(f2);
File.add(f3);
File.add(f4);
File.add(f5);
bar.add(File);
//Make "Edit" on menu
JMenu Edit = new JMenu("Edit");
JMenuItem e1 = new JMenuItem("Cut");
JMenuItem e2 = new JMenuItem("Paste");
JMenuItem e3 = new JMenuItem("Copy");
JMenuItem e4 = new JMenuItem("Repeat");
JMenuItem e5 = new JMenuItem("Undo");
Edit.add(e5);
Edit.add(e4);
Edit.add(e1);
Edit.add(e3);
Edit.add(e2);
bar.add(Edit);
//Make "View" on menu
JMenu View = new JMenu("View");
JMenuItem v1 = new JMenuItem("Bold");
JMenuItem v2 = new JMenuItem("Italic");
JMenuItem v3 = new JMenuItem("Normal");
JMenuItem v4 = new JMenuItem("Bold-Italic");
View.add(v1);
View.add(v2);
View.add(v3);
View.addSeparator();
View.add(v4);
bar.add(View);
//Make "Help" on menu
JMenu Help = new JMenu("Help");
JMenuItem h1 = new JMenuItem("Help Online");
JMenuItem h2 = new JMenuItem("E-mail Programmer");
Help.add(h1);
Help.add(h2);
bar.add(Help);
setJMenuBar(bar);
//Make Contents of window.
//Make "Subject" text field
JPanel row2 = new JPanel();
JLabel sublabel = new JLabel("Subject:");
row2.add(sublabel);
JTextField text2 = new JTextField("RE:",24);
row2.add(text2);
//Make "To" text field
JPanel row1 = new JPanel();
JLabel tolabel = new JLabel("To:");
row1.add(tolabel);
JTextField text1 = new JTextField(24);
row1.add(text1);
//Make "Message" text area
JPanel row3 = new JPanel();
JLabel Meslabel = new JLabel("Message:");
row3.add(Meslabel);
JTextArea text3 = new JTextArea(6,22);
messagearea.setLineWrap(true);
messagearea.setWrapStyleWord(true);
JScrollPane scroll = new JScrollPane(text3,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
row3.add(scroll);
add(row1);
add(row2);
add(row3);
setVisible(true);
public static void main(String[] arguments) {
Message Message = new Message();
}Ok, given that I may have not been the kindest to you on the other thread (and I'm still annoyed that you went and cross-posted this), and that you did actually use code tags, I'm going to post some code here:
Please take the following advice onboard though.
1. When you are naming your artifacts, please use the java coding standard as your guide. So if you are naming a class you use a capital letter first, and use camel case thereafter. All method names begin with a lower case letter, and all variable names begin with a lower case letter (and again camel case after that)
2. Please use self explanitory names (for everything), so no more row1, row2, or text1, text2, etc.
3. The example I am giving below makes use of a single class to handle all actions, this is not really the best way to do this, and a better way would be to have a class to handle each action (that would remove the massive if() else if() in the action handler class.
4. When you are using class variables they should be private (no exceptions, ever!), if you need to access them from other classes use accessors (eclipse and other IDE tools can generate these methods for you in seconds)
5. Notice the naming convention for my constants (final statics), they are all upper case (again from the java coding standards document, which you are going to look for with google right?)
6. I have hived some of the creation work to helper methods (the getSubjectTextField() etc), although it isn't advisable to be calling other methods from the constructor, since this is a GUI, and you want it to appear as soon as you create the class, we won't worry about this, but perhaps as an execrise you could work out a better way to do this?
7. Personally, I don't like classes that implement listeners, unless they are specifically designed to do that job. So a Frame that is set up as an action listener is fine, provided the actions it listens for are associated with the frame, not its contents. If the actions are related to its contents, then a dedicated class is better.
8. Another personal opinion, but I feel it makes code clearer, but others may disagree. If you are creating a variable solely to hold the result of a calculation, to be passed to a method in the very next line, then don't create the variable, just pass the method as the argument to the method (feel free to ignore this advice if the method call is extremely long, and a local would make it easier to read)
Anyway, here is the code. I have removed most of the menu items, and leave this as an exercise for you. Also I have only created 2 methods (new and exit), I'll again leave it as an exercise for you to complete this.
package jdc;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;
public class Message extends JFrame {
/** Constant for the new action command. */
private static final String NEW_COMMAND = "New";
/** Constant for the exit action command. */
private static final String EXIT_COMMAND = "Exit";
/** Subject text field. */
private JTextField subjectTextField;
/** Recipient text field. */
private JTextField toTextField;
/** Message text area. */
private JTextArea messageTextArea;
public Message() {
super("Write a Message - by Kieran Hannigan");
setSize(370, 270);
FlowLayout flo = new FlowLayout(FlowLayout.RIGHT);
setLayout(flo);
setJMenuBar(createMenuBar());
// Add "Subject" text field
JPanel subjectRow = new JPanel();
subjectRow.add(new JLabel("Subject:"));
subjectRow.add(getSubjectTextField());
// Add "To" text field
JPanel toRow = new JPanel();
toRow.add(new JLabel("To:"));
toRow.add(getToTextField());
// Make "Message" text area
JPanel messageRow = new JPanel();
JScrollPane scroll = new JScrollPane(getMessageTextArea(), ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
messageRow.add(scroll);
add(toRow);
add(subjectRow);
add(messageRow);
setVisible(true);
* Clear all the fields.
public void createNewMessage() {
getSubjectTextField().setText("");
getToTextField().setText("");
getMessageTextArea().setText("");
* Exit the application.
public void exitApplication() {
if (JOptionPane.showConfirmDialog(this, "Are you sure you would like to exit now?", "Exit",
JOptionPane.YES_NO_OPTION) == JOptionPane.YES_OPTION) {
System.exit(0);
* @return The subject text field, (creates a new one if it doesn't already exist)
private JTextField getSubjectTextField() {
if (this.subjectTextField == null) {
this.subjectTextField = new JTextField("RE:", 24);
return this.subjectTextField;
* @return The to text field, (creates a new one if it doesn't already exist)
private JTextField getToTextField() {
if (this.toTextField == null) {
this.toTextField = new JTextField(24);
return this.toTextField;
* @return The message text area, (creates a new one if it doesn't already exist
private JTextArea getMessageTextArea() {
if (this.messageTextArea == null) {
this.messageTextArea = new JTextArea(6, 22);
this.messageTextArea.setLineWrap(true);
this.messageTextArea.setWrapStyleWord(true);
return this.messageTextArea;
* Helper method to create the menu bar.
* @return Menu bar with all menus and menu items added
private JMenuBar createMenuBar() {
JMenuBar bar = new JMenuBar();
JMenu fileMenu = new JMenu("File");
fileMenu.add(new JMenuItem(new MenuItemAction(this, NEW_COMMAND)));
fileMenu.add(new JMenuItem(new MenuItemAction(this, EXIT_COMMAND)));
bar.add(fileMenu);
// TODO add all other menu's and menu items here....
return bar;
* Private static class to handle all menu item actions.
private static class MenuItemAction extends AbstractAction {
/** Instance of the message class. */
private Message message;
* @param actionName
public MenuItemAction(Message messageFrame, String actionName) {
super(actionName);
this.message = messageFrame;
* @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals(NEW_COMMAND)) {
this.message.createNewMessage();
} else if (e.getActionCommand().equals(EXIT_COMMAND)) {
this.message.exitApplication();
// TODO Add the other event handlers here
public static void main(String[] arguments) {
Message messageFrame = new Message();
messageFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}If you have any questions, please let me know, as there are a number of new areas introduced that you may not have come across before. -
Hi i need help with getting my homework for school
im in a nine week class that ends tommorw and need help go\etting my program working properly these are the requirements ofr the assignments:
Modify the Inventory Program by adding a button to the GUI that allows the user to move
to the first item, the previous item, the next item, and the last item in the inventory. If the
first item is displayed and the user clicks on the Previous button, the last item should
display. If the last item is displayed and the user clicks on the Next button, the first item
should display.
· Add a company logo to the GUI using Java graphics classes.
Modify the Inventory Program to include an Add button, a Delete button, and a Modifybutton on the GUI. These buttons should allow the user to perform the corresponding actions on the item name, the number of units in stock, and the price of each unit. An item added to the inventory should have an item number one more than the previous last item. Add a Save button to the GUI that saves the inventory to a C:\data\inventory.dat file. Use exception handling to create the directory and file if necessary. Add a search button to the GUI that allows the user to search for an item in the inventory by the product name. If the product is not found, the GUI should display an appropriate message. If the product is found, the GUI should display that products information in the GUI. Post final .class and .java files as an attachment.
this is what i have there are three java files im puttong in here
first is the panel frame
import java.awt.GridLayout;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Component;
import javax.swing.SwingConstants;
import javax.swing.Icon;
import javax.swing.JComboBox;
import javax.swing.JTextArea;
import javax.swing.JList;
import java.util.*;
import java.text.NumberFormat;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.URL;
import java.io.*;
import java.util.Scanner;
import javax.swing.JOptionPane;
import java.text.NumberFormat;
public class PanelFrame extends JFrame
private JPanel buttonJPanel; // panel to hold buttons
private JButton buttons[]; // array of buttons
private JLabel label1; // JLabel iventory number
private JLabel label2; // JLabel product name
private JLabel label3; // JLabel product price
private JLabel label4; // JLabel product in stock
private String p_ProductName; // private variable for the employee name.
private int p_UnitCount; // private variable for the hours worked.
private double p_UnitPrice; // private variable for the hourly wage.
private int p_ItemNumber; // private inventory number
//create inventory object
Inventory myInventory = new Inventory ();
// no-argument constructor
public PanelFrame()
super( "Panel Demo" );
//Add items to the inventory within the Invntory
myInventory.addItem(new productinfo(1,"Html a Begginers Guide",14,29.99));
myInventory.addItem(new productinfo(2,"Html 4 for Dummies",6,29.99));
myInventory.addItem(new productinfo(3,"Visio Step by Step",7,24.99));
myInventory.addItem(new productinfo(4,"APA Publication Manual",14,47.99));
myInventory.addItem(new productinfo(5,"The Gregg Reference Manual",14,37.56));
setLayout( new FlowLayout() ); // set frame layout
// JLabel constructor with a string argument
label1 = new JLabel( "Inventory Number:%s: %d\n ",p_ItemNumber );
label1.setToolTipText( "This is Inventory number" );
add( label1 ); // add label1 to JFrame
label2 = new JLabel( "\n\nProduct Name: %s: %s\n", p_ProductName);
label2.setToolTipText( "This is Product Name" );
add( label2 ); // add label1 to JFrame
label3 = new JLabel( "\n\nPrice : %s:$%.2f\n",p_UnitPrice );
label3.setToolTipText( "This is product Price");
add( label3 ); // add label1 to JFrame
label4 = new JLabel( "\n\nQuanity %s: %d\n",p_UnitCount);
label4.setToolTipText( "This is Quanity in stock: " );
add( label4 ); // add label1 to JFrame
buttons = new JButton[ 4 ]; // create buttons array
buttonJPanel = new JPanel(); // set up panel
buttonJPanel.setLayout( new GridLayout( 1, buttons.length ) );
String names[] = { "First", "Previous", "Next", "Last" };
JButton buttons[] = new JButton[ names.length ];
// create and add buttons
for ( int count = 0; count < buttons.length; count++ )
buttons[ count ] = new JButton( names[ count ] );
buttonJPanel.add( buttons[ count ] ); // add button to panel
} // end for
// setup the logo for the GUI ...image needs to be in same directory as source code
URL url = this.getClass().getResource("book103.gif");
Image img = Toolkit.getDefaultToolkit().getImage(url);
// scale the image so that it'll fit in the GUI
Image scaledImage = img.getScaledInstance(100, 100, Image.SCALE_AREA_AVERAGING);
// create a JLabel with the image as the label's Icon
Icon logoIcon = new ImageIcon(scaledImage);
JLabel companyLogoLabel = new JLabel(logoIcon);
companyLogoLabel.setBorder(BorderFactory.createEmptyBorder(3,3,3,3));
// add the logo to the GUI
getContentPane().add(companyLogoLabel, BorderLayout.WEST);
add( buttonJPanel, BorderLayout.SOUTH ); // add panel to JFrame
} // end PanelFrame constructor
} // end class PanelFramethis is the original part again with the code tag added
import java.awt.GridLayout;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Component;
import javax.swing.SwingConstants;
import javax.swing.Icon;
import javax.swing.JComboBox;
import javax.swing.JTextArea;
import javax.swing.JList;
import java.util.;
import java.text.NumberFormat;
import javax.swing.;
import java.awt.;
import java.awt.event.;
import java.net.URL;
import java.io.*;
import java.util.Scanner;
import javax.swing.JOptionPane;
import java.text.NumberFormat;
public class PanelFrame extends JFrame
private JPanel buttonJPanel; // panel to hold buttons
private JButton buttons[]; // array of buttons
private JLabel label1; // JLabel iventory number
private JLabel label2; // JLabel product name
private JLabel label3; // JLabel product price
private JLabel label4; // JLabel product in stock
private String p_ProductName; // private variable for the employee name.
private int p_UnitCount; // private variable for the hours worked.
private double p_UnitPrice; // private variable for the hourly wage.
private int p_ItemNumber; // private inventory number
//create inventory object
Inventory myInventory = new Inventory ();
// no-argument constructor
public PanelFrame()
super( "Panel Demo" );
//Add items to the inventory within the Invntory
myInventory.addItem(new productinfo(1,"Html a Begginers Guide",14,29.99));
myInventory.addItem(new productinfo(2,"Html 4 for Dummies",6,29.99));
myInventory.addItem(new productinfo(3,"Visio Step by Step",7,24.99));
myInventory.addItem(new productinfo(4,"APA Publication Manual",14,47.99));
myInventory.addItem(new productinfo(5,"The Gregg Reference Manual",14,37.56));
setLayout( new FlowLayout() ); // set frame layout
// JLabel constructor with a string argument
label1 = new JLabel( "Inventory Number:%s: %d\n ",p_ItemNumber );
label1.setToolTipText( "This is Inventory number" );
add( label1 ); // add label1 to JFrame
label2 = new JLabel( "\n\nProduct Name: %s: %s\n", p_ProductName);
label2.setToolTipText( "This is Product Name" );
add( label2 ); // add label1 to JFrame
label3 = new JLabel( "\n\nPrice : %s:$%.2f\n",p_UnitPrice );
label3.setToolTipText( "This is product Price");
add( label3 ); // add label1 to JFrame
label4 = new JLabel( "\n\nQuanity %s: %d\n",p_UnitCount);
label4.setToolTipText( "This is Quanity in stock: " );
add( label4 ); // add label1 to JFrame
buttons = new JButton[ 4 ]; // create buttons array
buttonJPanel = new JPanel(); // set up panel
buttonJPanel.setLayout( new GridLayout( 1, buttons.length ) );
String names[] = { "First", "Previous", "Next", "Last" };
JButton buttons[] = new JButton[ names.length ];
// create and add buttons
for ( int count = 0; count < buttons.length; count++ )
buttons[ count ] = new JButton( names[ count ] );
buttonJPanel.add( buttons[ count ] ); // add button to panel
} // end for
// setup the logo for the GUI ...image needs to be in same directory as source code
URL url = this.getClass().getResource("book103.gif");
Image img = Toolkit.getDefaultToolkit().getImage(url);
// scale the image so that it'll fit in the GUI
Image scaledImage = img.getScaledInstance(100, 100, Image.SCALE_AREA_AVERAGING);
// create a JLabel with the image as the label's Icon
Icon logoIcon = new ImageIcon(scaledImage);
JLabel companyLogoLabel = new JLabel(logoIcon);
companyLogoLabel.setBorder(BorderFactory.createEmptyBorder(3,3,3,3));
// add the logo to the GUI
getContentPane().add(companyLogoLabel, BorderLayout.WEST);
add( buttonJPanel, BorderLayout.SOUTH ); // add panel to JFrame
} // end PanelFrame constructor
} // end class PanelFrame -
This morning, i downloaded about 16 songs to put on my ipod, and i manually dragged them over to my ipod to sync that way (like i always do because the music on my ipod came from a different computer which I no longer have) and on my way to work, i realized my ipod says "no content" under Music. However, when I plug my ipod into itunes and click on the music tab under my ipod name, all of my music is there. What happened and how do i get that music back on my ipod? I need help asap.
You had a glitch and the music files got corrupted. I know of no way to uncorrupt them.
You can try using a computer app like iFunbox
http://dl.i-funbox.com/
to see if yo can get them from the iPod in a usable file.
Otherwise you will have to re import them to your computer and sync
You can redownload most iTunes purchases by:
Downloading past purchases from the App Store, iBookstore, and iTunes Store -
Need help with my graphic calculator!!!
Hello everybody!! I need help with my little program I made.... The problem is that I am unable to use to calculate but it is possible to compile the code!! What should I do?? Thanks in advance.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Aritmetik extends JFrame implements ActionListener{
private JLabel l1 = new JLabel("Tal1: ", JLabel.LEFT);
private JLabel l2 = new JLabel("Tal2: ", JLabel.LEFT);
private JLabel l3 = new JLabel("Resultat",JLabel.LEFT);
private JLabel l4 = new JLabel(" ", JLabel.RIGHT);
private JTextField t1 = new JTextField(" ",10);
private JTextField t2 = new JTextField(" ",10);
private JButton b1 = new JButton("+");
private JButton b2 = new JButton("-");
private JButton b3 = new JButton("*");
private JButton b4 = new JButton("/");
public Aritmetik(){
Container v = getContentPane();
v.setLayout(new GridLayout(5,2));
v.add(l1);
v.add(t1);
v.add(l2);
v.add(t2);
v.add(b1);
v.add(b2);
v.add(b3);
v.add(b4);
v.add(l3);
v.add(l4);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
pack();
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
public void actionPerformed(ActionEvent e){
int tal1 = Integer.parseInt(t1.getText());
int tal2 = Integer.parseInt(t2.getText());
if(e.getSource() == b1){
if(t1.getText().equals("") || t2.getText().equals(""))
JOptionPane.showMessageDialog(null, "Mata in tal!");
else{
l3.setText("Resultat ");
l4.setText(" " + (tal1+tal2));
else if(e.getSource() == b2){
int sub = tal1-tal2;
l4.setText(" " + (sub));
else if(e.getSource() == b3){
int multi = tal1*tal2;
l4.setText(" " + (multi));
else if(e.getSource() == b4){
int div = tal1/tal2;
l4.setText(" " + (div));
public static void main(String[] arg){
Aritmetik A =new Aritmetik();Here is your problem:
public void actionPerformed(ActionEvent e){
int tal1 = Integer.parseInt(t1.getText().trim()); // add the trim()
int tal2 = Integer.parseInt(t2.getText().trim()); // add the trim()
if(e.getSource() == b1){
if(t1.getText().equals("") || t2.getText().equals(""))
JOptionPane.showMessageDialog(null, "Mata in tal!");
else{
l3.setText("Resultat ");
l4.setText(" " + (tal1+tal2));
}... Better ...
public void actionPerformed(ActionEvent e) throws NumberFormatException {
String tala = t1.getText().trim();
String talb = t2.getText().trim();
if ( tala == null || "".equals(tala) || talb == null || "".equals(talb) ) {
JOptionPane.showMessageDialog(null, "Mata in tal!");
return();
int tal1 = Integer.parseInt(tala);
int tal2 = Integer.parseInt(talb);
if(e.getSource() == b1){
l3.setText("Resultat ");
l4.setText(" " + (tal1+tal2));
else if(e.getSource() == b2){
int sub = tal1-tal2;
l4.setText(" " + (sub));
else if(e.getSource() == b3){
int multi = tal1*tal2;
l4.setText(" " + (multi));
else if(e.getSource() == b4){
int div = tal1/tal2;
l4.setText(" " + (div));
}Message was edited by:
abillconsl
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