Chess: Java Swing problem!! Help need
Hi, I have just learn java swing and now creating a chess game. I have sucessfully create a board and able to display chess pieces on the board. By using JLayeredPane, I am able to use drag and drop for the piece. However, there is a problem which is that I can drop the chess piece off the board and the piece would disappear. I have try to solve this problem by trying to find the location that the chess piece is on, store it somewhere and check if the chess piece have been drop off bound. However, I could not manage to solve it. Also, I am very confuse with all these layer thing.
Any suggestion would be very helpful. Thanks in advance
I wonder if you are biting off a little more than you can chew. This seems like a big project for a beginning coder. Anyway, my suggestions can only be general since we only have general information:
1) Break the big problem down into little pieces. Get the pieces working, then put them together.
2) Make sure your program logic is separate from your GUI.
3) If still having problems, post an SSCCE. See this link to tell you how:
http://homepage1.nifty.com/algafield/sscce.html
4) And as camikr would say (and flounder just said): next time, post this in the Swing forum.
Good luck!
Similar Messages
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Hi, I have just learn java swing and now creating a chess game. I have sucessfully create a board and able to display chess pieces on the board. By using JLayeredPane, I am able to use drag and drop for the piece. However, there is a problem which is that I can drop the chess piece off the board and the piece would disappear. I have try to solve this problem by trying to find the location that the chess piece is on, store it somewhere and check if the chess piece have been drop off bound. However, I could not manage to solve it. Also, I am very confuse with all these layer thing.
Any suggestion would be very helpful. Thanks in advance
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class ChessBoard extends JFrame implements MouseListener, MouseMotionListener
Object currentPosition;
Color currentColor;
Dimension boardSize = new Dimension(600, 600);
JLayeredPane layeredPane;
JPanel board;
JPanel box;
JLabel chessPiece;
int xAdjustment;
int yAdjustment;
public ChessBoard()
// Use a Layered Pane for this this application
layeredPane = new JLayeredPane();
getContentPane().add(layeredPane);
layeredPane.setPreferredSize( boardSize );
layeredPane.addMouseListener( this );
layeredPane.addMouseMotionListener( this );
// Add a chess board to the Layered Pane
board = new JPanel();
// set "board" to the lowest layer (default_layer)
layeredPane.add(board, JLayeredPane.DEFAULT_LAYER);
board.setLayout( new GridLayout(8, 8) );
board.setPreferredSize( boardSize );
board.setBounds(0, 0, boardSize.width, boardSize.height);
addShade();
addPiece();
public void addShade()
for (int i = 0; i < 64; i++)
box = new JPanel( new BorderLayout() );
board.add( box, BorderLayout.CENTER );
if( ((i / 8) % 2) == 0)
if( (i % 2) ==0)
box.setBackground(Color.lightGray);
} else {
box.setBackground( Color.white);
} else {
if( (i % 2) ==0)
box.setBackground(Color.white);
} else {
box.setBackground(Color.lightGray);
//Method for adding chess pieces to the board
public void addPiece()
// Add a few pieces to the board
//black pieces
for (int i = 0; i < 64; i++)
//adding black pieces
if (i < 8)
String fileName = i + ".gif";
JLabel blackPieces = new JLabel( new ImageIcon( fileName ) );
JPanel panel = (JPanel)board.getComponent( i );
panel.add( blackPieces );
//adding black pones
if ((i > 7) && (i < 16))
String fileName = "8.gif";
JLabel blackPones = new JLabel( new ImageIcon( fileName ) );
JPanel panel = (JPanel)board.getComponent( i );
panel.add( blackPones );
//jump to white position (Component 48)
if (i == 16) i = 48;
//adding white pones
if(( i > 47 ) && (i < 56))
JLabel whitePones = new JLabel( new ImageIcon("48.gif") );
JPanel panel = (JPanel)board.getComponent( i );
panel.add( whitePones );
//adding white pieces
if (i > 55)
String fileName = i + ".gif";
JLabel whitePieces = new JLabel( new ImageIcon( fileName ) );
JPanel panel = (JPanel)board.getComponent( i);
panel.add( whitePieces );
** Add the selected chess piece to the dragging layer so it can be moved
public void mousePressed(MouseEvent e)
chessPiece = null;
Component c = board.findComponentAt(e.getX(), e.getY());
c.setBackground(Color.red);
if (c instanceof JPanel) return;
Point parentLocation = c.getParent().getLocation();
xAdjustment = parentLocation.x - e.getX();
yAdjustment = parentLocation.y - e.getY();
chessPiece = (JLabel)c;
chessPiece.setLocation(e.getX() + xAdjustment, e.getY() + yAdjustment);
chessPiece.setSize(chessPiece.getWidth(), chessPiece.getHeight());
layeredPane.add(chessPiece, JLayeredPane.DRAG_LAYER);
** Move the chess piece around
public void mouseDragged(MouseEvent me)
if (chessPiece == null) return;
chessPiece.setLocation(me.getX() + xAdjustment, me.getY() + yAdjustment);
** Drop the chess piece back onto the chess board
public void mouseReleased(MouseEvent e)
Component c = board.findComponentAt(e.getX(), e.getY());
int x = (int)c.getBounds().getX();
int y = (int)c.getBounds().getY();
System.out.println(c.getLocation());
System.out.println(x + " "+ y);
c.setBackground(currentColor);
if (chessPiece == null) return;
chessPiece.setVisible(false);
if (c instanceof JLabel)
Container parent = c.getParent();
//remove the piece that is capture
parent.remove(0);
parent.add( chessPiece );
else
Container parent = (Container)c;
parent.add( chessPiece );
chessPiece.setVisible(true);
public void mouseClicked(MouseEvent e) {}
public void mouseMoved(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
private static void createAndShowGUI()
//Make sure we have nice window decorations
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new ChessBoard();
frame.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
//Display the window
frame.pack();
frame.setResizable( false );
frame.setLocationRelativeTo( null );
frame.setVisible(true);
public static void main(String[] args)
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI
javax.swing.SwingUtilities.invokeLater( new Runnable()
public void run()
createAndShowGUI();
}import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class ChessBoardRx extends JFrame implements MouseListener, MouseMotionListener
Object currentPosition;
Color currentColor;
Dimension boardSize = new Dimension(600, 600);
JLayeredPane layeredPane;
JPanel board;
JPanel box;
JLabel chessPiece;
int xAdjustment;
int yAdjustment;
Container lastParent;
public ChessBoardRx()
// Use a Layered Pane for this this application
layeredPane = new JLayeredPane();
getContentPane().add(layeredPane);
layeredPane.setPreferredSize( boardSize );
layeredPane.addMouseListener( this );
layeredPane.addMouseMotionListener( this );
// Add a chess board to the Layered Pane
board = new JPanel();
// set "board" to the lowest layer (default_layer)
layeredPane.add(board, JLayeredPane.DEFAULT_LAYER);
board.setLayout( new GridLayout(8, 8) );
board.setPreferredSize( boardSize );
board.setBounds(0, 0, boardSize.width, boardSize.height);
addShade();
addPiece();
// populateBoard();
public void addShade()
for (int i = 0; i < 64; i++)
box = new JPanel( new BorderLayout() );
board.add( box, BorderLayout.CENTER );
if( ((i / 8) % 2) == 0)
if( (i % 2) ==0)
box.setBackground(Color.lightGray);
} else {
box.setBackground( Color.white);
} else {
if( (i % 2) ==0)
box.setBackground(Color.white);
} else {
box.setBackground(Color.lightGray);
//Method for adding chess pieces to the board
public void addPiece()
// Add a few pieces to the board
//black pieces
for (int i = 0; i < 64; i++)
//adding black pieces
if (i < 8)
String fileName = i + ".gif";
JLabel blackPieces = new JLabel( new ImageIcon( fileName ) );
JPanel panel = (JPanel)board.getComponent( i );
panel.add( blackPieces );
//adding black pones
if ((i > 7) && (i < 16))
String fileName = "8.gif";
JLabel blackPones = new JLabel( new ImageIcon( fileName ) );
JPanel panel = (JPanel)board.getComponent( i );
panel.add( blackPones );
//jump to white position (Component 48)
if (i == 16) i = 48;
//adding white pones
if(( i > 47 ) && (i < 56))
JLabel whitePones = new JLabel( new ImageIcon("48.gif") );
JPanel panel = (JPanel)board.getComponent( i );
panel.add( whitePones );
//adding white pieces
if (i > 55)
String fileName = i + ".gif";
JLabel whitePieces = new JLabel( new ImageIcon( fileName ) );
JPanel panel = (JPanel)board.getComponent( i);
panel.add( whitePieces );
private void populateBoard() {
int[][] pos = {
{ 9, 7, 5, 1, 3, 5, 7, 9 },
{ 8, 6, 4, 0, 2, 4, 6, 8 }
for(int j = 0; j < 8; j++) {
String fileName = "chessImages/" + pos[0][j] + ".jpg";
JLabel label = new JLabel( new ImageIcon( fileName ) );
JPanel panel = (JPanel)board.getComponent( j );
panel.add( label );
for(int j = 8; j < 16; j++) {
String fileName = "chessImages/" + 11 + ".jpg";
JLabel label = new JLabel( new ImageIcon( fileName ) );
JPanel panel = (JPanel)board.getComponent( j );
panel.add( label );
for(int j = 56, k = 0; j < 64; j++, k++) {
String fileName = "chessImages/" + pos[1][k] + ".jpg";
JLabel label = new JLabel( new ImageIcon( fileName ) );
JPanel panel = (JPanel)board.getComponent( j );
panel.add( label );
for(int j = 48; j < 56; j++) {
String fileName = "chessImages/" + 10 + ".jpg";
JLabel label = new JLabel( new ImageIcon( fileName ) );
JPanel panel = (JPanel)board.getComponent( j );
panel.add( label );
** Add the selected chess piece to the dragging layer so it can be moved
public void mousePressed(MouseEvent e)
chessPiece = null;
Component c = board.findComponentAt(e.getX(), e.getY());
c.setBackground(Color.red);
if (c instanceof JPanel) return;
lastParent = c.getParent();
Point parentLocation = c.getParent().getLocation();
xAdjustment = parentLocation.x - e.getX();
yAdjustment = parentLocation.y - e.getY();
chessPiece = (JLabel)c;
chessPiece.setLocation(e.getX() + xAdjustment, e.getY() + yAdjustment);
chessPiece.setSize(chessPiece.getWidth(), chessPiece.getHeight());
layeredPane.add(chessPiece, JLayeredPane.DRAG_LAYER);
** Move the chess piece around
public void mouseDragged(MouseEvent me)
if (chessPiece == null) return;
chessPiece.setLocation(me.getX() + xAdjustment, me.getY() + yAdjustment);
** Drop the chess piece back onto the chess board
public void mouseReleased(MouseEvent e)
Component c = board.findComponentAt(e.getX(), e.getY());
if(c == null) {
layeredPane.remove(chessPiece);
lastParent.add(chessPiece);
Rectangle r = lastParent.getBounds();
chessPiece.setLocation(r.x+xAdjustment, r.y+yAdjustment);
lastParent.validate();
lastParent.repaint();
return;
int x = (int)c.getBounds().getX();
int y = (int)c.getBounds().getY();
System.out.println(c.getLocation());
System.out.println(x + " "+ y);
c.setBackground(currentColor);
if (chessPiece == null) return;
chessPiece.setVisible(false);
if (c instanceof JLabel)
Container parent = c.getParent();
//remove the piece that is capture
parent.remove(0);
parent.add( chessPiece );
else
Container parent = (Container)c;
parent.add( chessPiece );
chessPiece.setVisible(true);
public void mouseClicked(MouseEvent e) {}
public void mouseMoved(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
private static void createAndShowGUI()
//Make sure we have nice window decorations
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new ChessBoardRx();
frame.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
//Display the window
frame.pack();
frame.setResizable( false );
frame.setLocationRelativeTo( null );
frame.setVisible(true);
public static void main(String[] args)
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI
javax.swing.SwingUtilities.invokeLater( new Runnable()
public void run()
createAndShowGUI();
} -
A tiny font is used in many places across Java Swing applications (help!)
In many places in Java but mostly in text boxes I'm seeing a very small font that is quite hard to read.
I am seeing this all over the place in Java programs and it is getting on my nerves.
I'm not sure what is causing this.
I also encountered this issue when running Java on Windows XP.
I really need help on how to solve this,
Or maybe it is actually a bug with Java itself and Windows?
An image of the problem in SwingSet2:
[SwingSet 2 Tiny Font Example|http://img687.imageshack.us/img687/1373/swingset2tinyfont.png]
System spec:
Windows 7 Professional 32-bit (Aero is on)
Java 6 Update 20
English system locale and language
No special dpi settings (default)
Screen Resolution: 1280x1024
Avast Antivirus 5.0
An intel graphics card
Edited by: Temp111 on May 9, 2010 7:38 AMcamickr wrote:
That is not a problem. Somewhere in that code the programmer uses setFont(....) to make it a smaller font. The default font of a text component does not behave like that.
For more help create a [SSCCE (Short, Self Contained, Compilable and Executable, Example Program)|http://sscce.org/], that demonstrates the incorrect behaviour.
Don't forget to use the Code Formatting Tags so the posted code retains its original formatting. That is done by selecting the code and then clicking on the "Code" button above the question input area.No, it's defiantly a problem. Probably in the default fonts that Swing uses in some places.
I detected one place where I can easily trigger this issue, a JTextArea And the Windows Look and Feel, So here is a SSCCE for you:
[Picture Of Tiny Font SSCCE With Tiny Font issue|http://img88.imageshack.us/img88/7876/tinyfont.png]
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TinyFont {
public static void main(String[] args) {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (UnsupportedLookAndFeelException e) {
e.printStackTrace();
JFrame frame = new JFrame("Tiny Font");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextArea textArea = new JTextArea("Tiny Font Test");
frame.add(textArea);
frame.setSize(150, 100);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}But I also encountered this issue in other places that use Swing.
Try SwingSet2 Source Code Tab for example: [SwingSet2|http://java.sun.com/products/jfc/jws/SwingSet2.jnlp] -
JDBC Java- mysql problem help!
Hi, I wnat to connect to mySQL fromo Java, I followed all the instructions from the mySql web page, yet I havent been able to do it, when I compile the java progrm I keep getting class not found exceptions, I am using Fedora Core and Java was already installed-well I chose to install it when I installed the operating system, the point is that the paths are all assigned by he system not by me.
WHat can I do?, Ive been trying over andover again with no results, hopefully somebody can help, I tried to include all the configuration in this email,
thank you
my java program is the following:
t.java
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class t {
public static void main (String[] args) {
System.out.println("Hello, world!\n");
Class.forName("com.mysql.jdbc.Driver");
when I javac t.java
I have the following error
4. ERROR in t.java
(at line 11)
Class.forName("com.mysql.jdbc.Driver");
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Unhandled exception type ClassNotFoundException
when I comment out the Class.forName the hello world rogram runs fine
when I vi /etc/java java.conf this is the result
# System-wide Java configuration file -- sh --
# JPackage Project [www.jpackage.org]
# Location of jar files on the system
JAVA_LIBDIR=/usr/share/java
# Location of arch-specific jar files on the system
JNI_LIBDIR=/usr/lib/java
# Root of all JVM installations
JVM_ROOT=/usr/lib/jvm
# You can define a system-wide JVM root here if you're not using the default one#JAVA_HOME=$JVM_ROOT/java-gcj
# Options to pass to the java interpreter
JAVACMD_OPTS=
~
[root@localhost test]# echo $PATH
/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin
echo $JAVA_HOME
it contains nothing
ls /usr/share java*
java
java-1.3.0
java-1.4.0
java-1.4.1
java-1.4.2
java-1.5.0
javadoc
java-ext
java-utils
mysql-connector-java-3.1.13-bin.jar is under
/usr/share/java
in /etc/profile I have:
export CLASSPATH=$CLASSPATH:/usr/share/java/mysql-connector-java-3.1.13-bin.jar
in /root/.bash_profile i have
CLASSPATH=/usr/share/java/mysql-connector-java-3.1.13-bin.jar:/usr/lib/java-ext/mysql-connector/mysql-connector-java-3.1.13-bin.jar
export CLASSPATH
when I echo $PATH i have
/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/binThanks duff,
The driver seems to be found
when I run
public class t {
public static void main (String[] args) {
try
System.out.println("Hello, world!\n");
Class.forName("com.mysql.jdbc.Driver");
System.out.println("MySQL Driver Found");
catch (ClassNotFoundException e)
System.out.println("MySQL Driver NOT Found");
e.printStackTrace();
I feel somehow ive been focusing in the wrong side of the problem due to my ignorance in Java. Please help me to understand, the reson for which ithe runtime was telling me that there was an unhandled exception was because it is a requirement to handle all exceptions of this kind? why wouldnt it cmplain if I jst did the hello world without any exception handling, maybe because it is a requirement in the Class.forName...
the other question is, is the message I was obtaining completely independent of the fact that the class was or was not found?
Maybe, I should go with these questions to the newbies forum...
thanks -
Basic java problem help needed please
the problem is :
to produce a program which will show membership rates for a golf club..
membership yearly rate new member joining fee
category
full 650 3000
associate 200
ladies 350 2000
under 18 175
new members must pay a joining fee in addition to the yearly rate as shown
full/ladies members also prepay 150
write a program which will enter details of members,calculate and output the total amount each member should pay.
output number of members in each category
the total income for each category....
i need this program to show each category individually...cant do it at all..been at it a week....must be me && and || signs...i think...plz can someone help me as im really stuck now...thank you so much..
import java.util.Scanner;
public class assignmentquestion3 {
public static Scanner key=new Scanner(System.in);
public static void main(String []args){
int fullfee=800,newfullfee=3800,associatefee=200,newla diesfee= 2350,ladiesfee= 350,under18fee = 175;
int selectcat=0;
int reply = 0;
int addmember=0;
int currentfulltotalmem=0,newfulltotalmem=0,associatet otalmem=0,ladiestotalmem=0,under18totalmem=0;
int assoctotalcash=0,ladiestotalcash=0,under18totalcas h=0;
int fullprepay=150;
int ladiesfull=2500;
int completefull = 0;
int ladiescurrent=500;
int under18=175;
//Main introduction screen for the user and selections available. do while loops only allowing numbers 1,2,3 or 4.
do{
do{
System.out.printf("\n\t %90s","********************Membership Rates For The Golf Club********************");
System.out.printf("\n\n %105s","This program will allow users to enter details of members as well as calculating and.");
System.out.printf("\n%106s","outputing the total amount each member should pay. The program allows users to view the");
System.out.printf("\n%106s","total number of members in each category and the total income for each category.");
System.out.printf("\n\n\t %75s","Please select your membership category: ");
System.out.printf("\n\n\t %68s","Please press '1' for FULL");
System.out.printf("\n\n\t %68s","Please press '2' for ASSOCIATE");
System.out.printf("\n\n\t %68s","Please press '3' for LADIES");
System.out.printf("\n\n\t %68s","Please press '4' for UNDER 18");
System.out.printf("\n\n\t %68s","Please enter 1,2,3 or 4: ");
selectcat=key.nextInt();
}while (selectcat>4 || selectcat<1);
do{
System.out.printf("\n\n\t %75s","Are you a Current Member (press 1) or a New Member (press 2): ");
reply=key.nextInt();
}while (reply<1 || reply>2);
//if number '1' for 'FULL' category is selected by the user and reply is 'yes'(1) then new full member fee is shown to user
if (selectcat==1 ||reply==1)
System.out.printf("\n\n\t %68s","CURRENT FULL MEMBERSHIP SELECTED");
System.out.printf("\n\n\t %68s","Current full membership fees yearly are "+fullfee+"");
System.out.printf("\n\n\t %68s","Full members must also pre-pay "+fullprepay+" on a card can be used in the club facilities such as bar and shop ");
System.out.printf("\n\n\t %72s","The total of this membership is: "+fullfee+"");
currentfulltotalmem=currentfulltotalmem+1;
System.out.printf("\n\n\t %72s","The total number of 'CURRENT FULL MEMBERSHIPS = "+currentfulltotalmem+"");
completefull=completefull+fullfee;
System.out.printf("\n\n\t %68s","The total amount of income for 'FULL MEMBERSHIPS' within the club = "+completefull+"");
//if number '1' is selected by the user and reply is 'no' (2) then full member fee is shown to user
else if (selectcat==1 &&reply==2)
System.out.printf("\n\n\t %68s","NEW FULL MEMBERSHIP SELECTED");
System.out.printf("\n\n\t %68s","Full membership fees yearly are "+newfullfee+"");
newfulltotalmem=newfulltotalmem+1;
System.out.printf("\n\n\t %68s","The total number of 'NEW FULL MEMBERSHIPS = "+newfulltotalmem+"");
completefull=completefull+newfullfee;
System.out.printf("\n\n\t %68s","The total amount of income for 'FULL MEMBERSHIPS' within the club = "+completefull+"");
//if number '2' is selected by the user then associate member fee is shown to user
if (selectcat==2 &&(reply==1 || reply==2))
System.out.printf("\n\n\t %75s","ASSOCIATE MEMBERSHIP SELECTED");
System.out.printf("\n\n\t %75s","ASSOCIATE membership fees yearly are "+associatefee+"");
associatetotalmem=associatetotalmem+1;
System.out.printf("\n\n\t %75s","The total number of 'ASSOCIATE MEMBERSHIPS' WITHIN THE CLUB = "+associatetotalmem+"");
assoctotalcash=assoctotalcash+associatefee;
System.out.printf("\n\n\t %68s","The total amount of income for 'ASSOCIATE MEMBERSHIPS' within the club = "+assoctotalcash+"");
//if number '3' is selected by the user and reply is 'yes' then new ladies member fee is shown to user
if (selectcat==3 &&reply==1)
System.out.printf("\n\n\t %68s","LADIES CURRENT MEMBERSHIP SELECTED");
System.out.printf("\n\n\t %68s","Ladies full membership fees yearly are "+ladiesfee+"");
System.out.printf("\n\n\t %68s","Ladies must also pre-pay "+fullprepay+" on a card can be used in the club facilities such as bar and shop ");
System.out.printf("\n\n\t %68s","The total of this membership is: "+ladiescurrent+"");
ladiestotalmem=ladiestotalmem+1;
System.out.printf("\n\n\t %75s","The total number of 'LADIES MEMBERSHIPS' WITHIN THE CLUB = "+ladiestotalmem+"");
ladiestotalcash=ladiestotalcash+ladiescurrent;
System.out.printf("\n\n\t %68s","The total amount of income for 'LADIES MEMBERSHIPS' within the club = "+ladiestotalcash+"");
//if number '3' is selected by the user and reply is 'no' then the current ladies member fee is shown to user
else
if (selectcat==3 && reply==2)
System.out.printf("\n\n\t %68s","LADIES NEW MEMBERSHIP SELECTED");
System.out.printf("\n\n\t %68s","LADIES NEW MEMBERSHIP fees yearly are "+newladiesfee+"");
System.out.printf("\n\n\t %68s","Ladies must also pre-pay "+fullprepay+" on a card can be used in the club facilities such as bar and shop ");
System.out.printf("\n\n\t %68s","The total of this membership is: "+ladiesfull+"");
ladiestotalmem=ladiestotalmem+1;
System.out.printf("\n\n\t %75s","The total number of 'LADIES MEMBERSHIPS' within the club = "+ladiestotalmem+"");
ladiestotalcash=ladiestotalcash+ladiesfull;
System.out.printf("\n\n\t %68s","The total amount of income for 'LADIES MEMBERSHIPS' within the club = "+ladiestotalcash+"");
//if number '4' is selected by the user then under 18 member fee is shown to user
else if (selectcat==4 &&(reply==1||reply==2))
System.out.printf("\n\n\t %75s","UNDER 18 MEMBERSHIP SELECTED");
System.out.printf("\n\n\t %75s","UNDER 18 yearly membership fees are "+under18fee+"");}
System.out.printf("\n\n\t %68s","The total of this membership is: "+under18+"");
under18totalmem=under18totalmem+1;
System.out.printf("\n\n\t %75s","The total number of 'UNDER 18 MEMBERSHIPS' within the club = "+under18totalmem+"");
under18totalcash=under18totalcash+under18;
System.out.printf("\n\n\t %68s","The total amount of income for 'UNDER 18 MEMBERSHIPS' within the club = "+under18totalcash+"");
//allowing user to select '0' to add another member or any other key to exit program
System.out.printf("\n\n\t %68s","Please Press '0' to add another member or any other key to exit.: ");
addmember=key.nextInt();
}while (addmember==0 ||addmember>1);}}
the problem im having is whenever i make the choices 1,2,3,4 (CATEgorys) AND hit 1 or 2(current or new member selections) it brings up more than one category...
for example when i hit 1(Category full) and 1(current member)..it displays this:
Are you a Current Member (press 1) or a New Member (press 2): 1
CURRENT FULL MEMBERSHIP SELECTED
Current full membership fees yearly are 800
Full members must also pre-pay 150 on a card can be used in the club facilities such as bar and shop
The total of this membership is: 800
The total number of 'CURRENT FULL MEMBERSHIPS = 1
The total amount of income for 'FULL MEMBERSHIPS' within the club = 800
The total of this membership is: 175
The total number of 'UNDER 18 MEMBERSHIPS' within the club = 1
The total amount of income for 'UNDER 18 MEMBERSHIPS' within the club = 175
Please Press '0' to add another member or any other key to exit.:
under 18 membership as well?...does this for other selections too...is it my arithmetic operators?....my if loops?...Multi-post [http://forums.sun.com/thread.jspa?threadID=5346248&messageID=10498270#10498270]
And it still doesn't compile. -
I need to control the position and size of each java swing component, help!
I setup a GUI which include 2 panels, each includes some components, I want to setup the size and position of these components, I use setBonus or setSize, but doesn't work at all. please help me to fix it. thanks
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.FlowLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.event.*;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JPanel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.DefaultListModel;
public class weather extends JFrame {
private String[] entries={"1","22","333","4444"} ;
private JTextField country;
private JList jl;
private JTextField latitude;
private JTextField currentTime;
private JTextField wind;
private JTextField visibilityField;
private JTextField skycondition;
private JTextField dewpoint;
private JTextField relativehumidity;
private JTextField presure;
private JButton search;
private DefaultListModel listModel;
private JPanel p1,p2;
public weather() {
setUpUIComponent();
setTitle("Weather Report ");
setSize(600, 400);
setResizable(false);
setVisible(true);
private void setUpUIComponent(){
p1 = new JPanel();
p2 = new JPanel();
country=new JTextField(10);
latitude=new JTextField(12);
currentTime=new JTextField(12);
wind=new JTextField(12);
visibilityField=new JTextField(12);
skycondition=new JTextField(12);
dewpoint=new JTextField(12);
relativehumidity=new JTextField(12);
presure=new JTextField(12);
search=new JButton("SEARCH");
listModel = new DefaultListModel();
jl = new JList(listModel);
// jl=new JList(entries);
JScrollPane jsp=new JScrollPane(jl);
jl.setVisibleRowCount(8);
jsp.setBounds(120,120,80,80);
p1.add(country);
p1.add(search);
p1.add(jsp);
p2.add(new JLabel("latitude"));
p2.add(latitude);
p2.add(new JLabel("time"));
p2.add(currentTime);
p2.add(new JLabel("wind"));
p2.add(wind);
p2.add(new JLabel("visibility"));
p2.add(visibilityField);
p2.add(new JLabel("skycondition"));
p2.add(skycondition);
p2.add(new JLabel("dewpoint"));
p2.add(dewpoint);
p2.add(new JLabel("relativehumidity"));
p2.add(relativehumidity);
p2.add(new JLabel("presure"));
p2.add(presure);
this.getContentPane().setLayout(new FlowLayout());
this.setLayout(new GridLayout(1,2));
p2.setLayout(new GridLayout(8, 2));
this.add(p1);
this.add(p2);
public static void main(String[] args) {
JFrame frame = new weather();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}Use code tags to post codes -- [code]CODE[/code] will display asCODEOr click the CODE button and paste your code between the {code} tags that appear.
[http://java.sun.com/docs/books/tutorial/uiswing/layout/index.html]
db -
Install problems - help needed desperately for new Java user
I have been trying to install Java SE Development Kit 6 - Version 1.6.0_13. Initially I could not get the javac process to work no matter what I tried. After uninstalling and reinstalling numerous times I now have it so that my javac will rewrite my file from a .java to a .class file. Now when I try to execute my Hello.class file I am getting an error message....
Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/Object
Can anyone please help me fix this? I was really anxious to learn programming but all of these setbacks are really frustrating. I have basic books to help when I am up and running but nothing helps you with problems with installations.
Please help!!!Enigmafae wrote:
Thank you so much. Worked like a charm! I also installed from Explorer instead of Firefox. Maybe the Firefox installations were incompatible with my XP Environment????Worked fine for me... but I downloaded and then installed... I did NOT "run" the install over the network.
I don't care I'm just so thrilled it worked. Now I can get to learning the actual programming that I have been trying to get to.
Thx again for your help!I love it when a plan comes together.
~~ Hannibal. -
i am a student. working on a project. using java web services. using its api jax-rpc. i have compiled, deployed and run an example given in the tutorial of the web services tutorial\examples\jaxrpc\hello. now i want to bring the "hello" folder out of its original directory to e.g c:\project\. i have tried alot. i am not able to set the paths in the xml files provided. if any one of you can help me in this. my address is [email protected] . i am waiting for your reply.
Where are you stuck up.
Try the following steps
create a directory structure
c:\projects\jaxrpc
copy your example
<JWSDP>/docs/tutorial/examples/jaxrpc/hello to
c:\projects\jaxrpc
you may need to remove \build and \dist from the
example if you have already tried the example
copy your example
<JWSDP>/docs/tutorial/examples/jaxrpc/common to
c:\projects\jaxrpc
Now the example will run correctly but only the war
file is created in your original tutorial location.
Now modify tut-root in
c:\projects\jaxrpc\common\build.properties to
tut-root=C:\\projects
and modify the war-path in \hello\build.properties to
point to
war-path=${tut-root}/jaxrpc/${example}/dist/${deployabl
-war}
If anything fails first check the paths through
<YOUR_path>\hello>ant debug
If there is problem post details where it is failing.
Ri am trying this method. i will tell you when it is done. thank you. -
I am developing desktop application which has a functionality of web browser i have tried JEditorPanel which is used to load html pages.
the problem with this is it doesnt load even google.com or yahoo.com , like Internet Explorer , Mozilla etc. Neither it loads the pages containing flash , please let me know how can i do this.
I have a jpanel form on click of menu or button i want to call another jpanel form . i have tried with jFrameForm and it works but same doesnt work with jPanelform
Please help . your help will be appreciated
thanksBrowser Utility - Class to launch a URL in a web browser in
a platform independent manner. Includes an optional swing
GUI allowing user customization. [Open Source - GPL]
http://ostermiller.org/utils/Browser.html
BrowserLauncher - Open the system web browser with
particular attention paid to various Macintosh systems.
(Freeware)
http://browserlauncher.sourceforge.net/
Java World - With a little platform-specific Java code, you
can easily use your system's default browser to display any
URL in Windows or Unix.
http://www.javaworld.com/javaworld/javatips/jw-javatip66.html
JConfig - Class Libraries that allow a URL to be launched in
a browser on Windows, Unix, or Macintosh. [Commercial]
http://www.tolstoy.com/samizdat/jconfig.html
Apple - MRJFileUtils.openURL() not implemented in Mac OS X.
http://developer.apple.com/techpubs/macosx/ReleaseNotes/JavaGMWebReleaseNotes.html#MRJToolkit
Apple - How one would open a URL in a web browser on a
Macintosh.
http://developer.apple.com/qa/java/java12.html -
I have a swing application with 2 JComboBox 's, 1 JPanel (for pictures), 1 JButton and a scroll pane. Basicall the JComboBoxes have an action listener that changes the pictures when I cahnge the names. However, I would like the Jbutton when pressed to display the name chosen (from the JComboBox) and display it in the textArea. See code below.
import javax.swing.*;
import javax.swing.Action;
import java.awt.event.ActionEvent;
import java.awt.event.ItemListener;
import java.awt.*;
import java.awt.event.*;
* @author Administrator
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
public class choice_in2 extends JPanel implements ActionListener{
private JLabel contender1FieldLabel;
private JLabel contender2FieldLabel;
private JButton runButton;
JLabel picture1;
JLabel picture2;
//Text area which shows the result
private JTextArea textArea;
private JLabel textAreaLabel;
public choice_in2(){
// Create a ChoiceField for the input of first contender
contender1FieldLabel = new JLabel("Contender1 ",4);
String[] contender1Strings = { "Bill", "Bob", "Don", "Michael", "John" };
JComboBox contender1List = new JComboBox(contender1Strings);
contender1List.setSelectedIndex(1);
contender1List.addActionListener(new Eavesdropper1(picture1));
// Create a ChoiceField for the input of second contender
contender2FieldLabel = new JLabel("Contender2 ",4);
String[] contender2Strings = { "Philip", "Timothy", "Tom", "Kenneth", "Stone" };
JComboBox contender2List = new JComboBox(contender2Strings);
contender2List.setSelectedIndex(2);
contender2List.addActionListener(new Eavesdropper2(picture2));
//Set up the first picture.
picture1 = new JLabel();
picture1.setFont(picture1.getFont().deriveFont(Font.ITALIC));
picture1.setHorizontalAlignment(JLabel.CENTER);
updateLabel1(contender1Strings[contender1List.getSelectedIndex()]);
picture1.setBorder(BorderFactory.createEmptyBorder(10,0,0,0));
//Set up the second picture.
picture2 = new JLabel();
picture2.setFont(picture1.getFont().deriveFont(Font.ITALIC));
picture2.setHorizontalAlignment(JLabel.CENTER);
updateLabel2(contender2Strings[contender2List.getSelectedIndex()]);
picture2.setBorder(BorderFactory.createEmptyBorder(10,0,0,0));
//The preferred size is hard-coded to be the width of the
//widest image and the height of the tallest image + the border.
//A real program would compute this.
picture1.setPreferredSize(new Dimension(200, 220+10));
picture2.setPreferredSize(new Dimension(200, 220+10));
// Create a JButton that will compute
runButton = new JButton("Compute");
runButton.addActionListener(new Eavesdropper3(textArea));
// Create a JTextArea that will display the results
textAreaLabel = new JLabel("Results");
textArea = new JTextArea(10,70);
textArea.setFont(new Font("Courier",Font.PLAIN,12));
JScrollPane scrollPane = new JScrollPane(textArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
textArea.setEditable(false);
//Lay out the demo.
add(contender1List, BorderLayout.WEST);
add(picture1, BorderLayout.WEST);
add(contender2List, BorderLayout.EAST);
add(picture2, BorderLayout.EAST);
add(runButton, BorderLayout.EAST);
add(textAreaLabel, BorderLayout.SOUTH);
add(scrollPane, BorderLayout.SOUTH);
setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
/** Listens to the combo box. */
public void actionPerformed(ActionEvent e) {
public void updateLabel1(String name1) {
ImageIcon icon1 = createImageIcon( name1 + ".jpg");
picture1.setIcon(icon1);
picture1.setToolTipText("A drawing of a " + name1.toLowerCase());
if (icon1 != null) {
picture1.setText(null);
} else {
picture1.setText("Image not found");
public void updateLabel2(String name2) {
ImageIcon icon2 = createImageIcon( name2 + ".jpg");
picture2.setIcon(icon2);
picture2.setToolTipText("A drawing of a " + name2.toLowerCase());
if (icon2 != null) {
picture2.setText(null);
} else {
picture2.setText("Image not found");
/** Returns an ImageIcon, or null if the path was invalid. */
public ImageIcon createImageIcon(String path) {
java.net.URL imgURL = choice_in2.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
class Eavesdropper2 implements ActionListener {
JLabel myTextArea;
public Eavesdropper2(JLabel ta) {
myTextArea = ta;
public void actionPerformed(ActionEvent e) {
JComboBox contender2List = (JComboBox)e.getSource();
String contender2ListName = (String)contender2List.getSelectedItem();
updateLabel2(contender2ListName);
Eavesdropper3 code;
code = new Eavesdropper3(contender2ListName);
class Eavesdropper1 implements ActionListener {
JLabel myTextArea;
public Eavesdropper1(JLabel tt) {
myTextArea = tt;
public void actionPerformed(ActionEvent e) {
JComboBox contender1List = (JComboBox)e.getSource();
String contender1ListName = (String)contender1List.getSelectedItem();
updateLabel1(contender1ListName);
class Eavesdropper3 implements ActionListener {
String contender22;
JTextArea myTextArea;
public Eavesdropper3(JTextArea bb) {
myTextArea = bb;
public Eavesdropper3(String contender2ListName){
contender22 = contender2ListName;
* @return Returns the contender22.
public String getContender22() {
return contender22;
public void actionPerformed(ActionEvent e) {
textArea.setText("Wild Test");
textArea.append("\n OUTCOME \n\n " +getContender22());
}weebib
We are using Windows XP , Nvidia graphics card, with Multiview. I hope the problem is not specific to the platform.
It is reproducible with 1.4.2 and absent in 1.4.1
camickr
I am new to this forum. didn't know about code blocks. -
Pagination problem, help needed to finish it
Hi friends,
I am in need to use pagination in my Web Application, since i have a tons of values to display as a report. I develop a pagination logic, tested it seperately and it works fine.When i try to implement it to current project it works, but no result was displayed as it displayed in testing..
Here is the file i tested seperately..
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="com.rajk.javacode.servlets.dbmodel"%>
<%
int count=0;
int userid = 0;
String g = null;
dbmodel db=new dbmodel();
Statement ps = null;
ResultSet rs = null;
db.connect();
String SQL = "select * from tbl_rmadetails";
ps=db.con.createStatement();
rs=ps.executeQuery(SQL);
rs.last();
count= rs.getRow();
rs.beforeFirst();
int currentrs;
int pagecount=(count/2);
if((pagecount*2)+1>=count)
pagecount++;
out.println("<table width=363 height=20 align=center border=0 cellpadding=0 cellspacing=0><tr><td>");
for(int i=1;i<pagecount;i++)
out.println("<font face=verdana size=1><a href=pagination.jsp?pagenum="+ i +"&userid="+ userid +">["+ i +"]</a></font>");
String pagenum=request.getParameter("pagenum");
if(pagenum==null)
out.println("<br><strong><font face=verdana size=1 color=white>Page 1 of " + (pagecount-1) +"</font></strong>");
currentrs=0;
else
out.println("<br><strong><font face=verdana size=1 color=white>Page " + pagenum + " of " + (pagecount-1) + "</font></strong>");
pagecount=Integer.parseInt(pagenum);
currentrs=(2*(pagecount-1));
out.println("</td></tr></table>");
//messageboard
String sql="select * from tbl_rmadetails order by date LIMIT " + currentrs + ",2";
rs=ps.executeQuery(sql);
while(rs.next())
%>
<br>
<table width="363" height="64" border="1" align="center" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF">
<tr>
</td>
<td width="126" height="19" align="center" valign="top"><font face="verdana" size="1"><strong><%=rs.getString("serial_no")%></strong></font></td>
<td width="126" height="19" align="center" valign="top"><font face="verdana" size="1"><strong><%=rs.getString("status")%></strong></font></td>
</tr>
</table></td>
</tr>
</table>
<%
rs.close();
%> And here is the file in which i want to implement the pagination..
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="com.rajk.javacode.servlets.dbmodel"%>
<%
int x1=0;
int userid = 0;
int count = 0;
String raj=request.getParameter("q");
String temp=null;
String SQL = null;
String SQLX = null;
int currentrs;
try
dbmodel db=new dbmodel();
Statement ps = null;
ResultSet rs = null;
db.connect();
if(raj.equals("All Vendor"))
SQL = "SELECT * FROM tbl_rmadetails,tbl_customer,tbl_item,tbl_vendor WHERE tbl_rmadetails.customer_id=tbl_customer.customer_id AND tbl_rmadetails.item_id=tbl_item.item_id AND tbl_rmadetails.vendor_id=tbl_vendor.vendor_id AND tbl_rmadetails.status='STS'";
else
SQL = "SELECT * FROM tbl_rmadetails,tbl_customer,tbl_item,tbl_vendor WHERE tbl_rmadetails.customer_id=tbl_customer.customer_id AND tbl_rmadetails.item_id=tbl_item.item_id AND tbl_rmadetails.status='STS' AND tbl_rmadetails.vendor_id=tbl_vendor.vendor_id AND tbl_rmadetails.vendor_id='"+raj+"'";
ps=db.con.createStatement();
rs=ps.executeQuery(SQL);
rs.last();
count= rs.getRow();
rs.beforeFirst();
rs.close();
int pagecount=(count/6)+1;
if((pagecount*6)+1>=count)
pagecount++;
//out.print(count);
%>
<%
for(int i=1;i<pagecount;i++)
out.println("<font face=verdana size=1><a href=http://localhost:8080/rmanew/sendtovendor.jsp?pagenum="+ i +"&userid="+ userid +">["+ i +"]</a></font>");
String pagenum=request.getParameter("pagenum");
if(pagenum==null)
out.println("<br><strong><font face=verdana size=1 color=white>Page 1 of " + (pagecount-1) +"</font></strong>");
currentrs=0;
else
out.println("<br><strong><font face=verdana size=1 color=white>Page " + pagenum + " of " + (pagecount-1) + "</font></strong>");
pagecount=Integer.parseInt(pagenum);
currentrs=(6*(pagecount-1));
if(raj.equals("All Vendor"))
SQLX = "SELECT * FROM tbl_rmadetails,tbl_customer,tbl_item,tbl_vendor WHERE tbl_rmadetails.customer_id=tbl_customer.customer_id AND tbl_rmadetails.item_id=tbl_item.item_id AND tbl_rmadetails.vendor_id=tbl_vendor.vendor_id AND tbl_rmadetails.status='STS' LIMIT"+currentrs+",6";
else
SQLX = "SELECT * FROM tbl_rmadetails,tbl_customer,tbl_item,tbl_vendor WHERE tbl_rmadetails.customer_id=tbl_customer.customer_id AND tbl_rmadetails.item_id=tbl_item.item_id AND tbl_rmadetails.status='STS' AND tbl_rmadetails.vendor_id=tbl_vendor.vendor_id AND tbl_rmadetails.vendor_id='"+raj+"' LIMIT"+currentrs+",6";
rs=ps.executeQuery(SQLX);
if(rs!=null)
while(rs.next())
%>
<link rel="stylesheet" type="text/css" href="chromejs/stvcss.css" />
<table width="100%" border="0">
<tr bgcolor="#0066CC">
<td align="center"><span class="style2">Date</span></td>
<td align="center" class="style2">Product Details</td>
<td align="center" class="style2">Serial No</td>
<td align="center" class="style2">Fault Desc</td>
<td align="center" class="style2">Customer Name</td>
<td align="center" class="style2">Vendor Name</td>
<tr>
<tr bgcolor="#CCCCCC">
<td align="center"><%=rs.getDate("date")%></td>
<td align="center"><%=rs.getString("item_description")%></td>
<td align="center"><%=rs.getString("serial_no")%></td>
<td align="center"><%=rs.getString("fault_desc")%></td>
<td align="center"><%=rs.getString("customer_name")%></td>
<td align="center"><%=rs.getString("vendor_name")%></td>
</tr>
</table>
<%
else
out.println("Result Set is empty");
catch(Exception e)
System.out.println("Error: " + e);
response.setContentType("text/xml");
response.setHeader("Cache-Control", "no-cache");
%>The output i got when i ran this page is..
[1]
And no records displayed matching the query, but there is a lot of datas in DB as a result of the queries i mentioned here..
Please help me friends...Debug your code. Check what happens and what happens not.
You could make it much easier if you wrote Java code in Java classes rather than JSP files. Now it's one big heap of mingled -and thus hard to maintain/test/reuse- code. -
Linked lists problem -- help needed
Hello again. I've got yet another problem in my C++ course that stems from my use of a Mac instead of Windows. I'm going to install Parallels so I can get Windows on my MacBook and install Visual Studio this week so that I don't have to deal with these discrepancies anymore, but in the meanwhile, I'm having a problem here that I don't know how to resolve. To be clear, I've spent a lot of time trying to work this out myself, so I'm not just throwing this up here to have you guys do the work for me -- I'm really stuck here, and am coming here as a last resort, so I'll be very, very appreciative for any help that anyone can offer.
In my C++ course, we are on a chapter about linked lists, and the professor has given us a template to make the linked lists work. It comes in three files (a header, a source file, and a main source file). I've made some adjustments -- the original files the professor provided brought up 36 errors and a handful of warnings, but I altered the #include directives and got it down to 2 errors. The problematic part of the code (the part that contains the two errors) is in one of the function definitions, print_list(), in the source file. That function definition is shown below, and I've marked the two statements that have the errors using comments that say exactly what the errors say in my Xcode window under those two statements. If you want to see the entire template, I've pasted the full code from all three files at the bottom of this post, but for now, here is the function definition (in the source file) that contains the part of the code with the errors:
void LinkedList::printlist( )
// good for only a few nodes in a list
if(isEmpty() == 1)
cout << "No nodes to display" << endl;
return;
for(CURSOR = FRONT_ptr; CURSOR; CURSOR = CURSOR-> link)
{ cout << setw(8) << CURSOR->name; } cout << endl; // error: 'setw' was not declared in this scope
for(CURSOR = FRONT_ptr; CURSOR; CURSOR = CURSOR-> link)
{ cout << setw(8) << CURSOR->test_grade; } cout << endl; // error: 'setw' was not declared in this scope
As you can see, the problem is with the two statements that contain the 'setw' function. Can anyone help me figure out how to get this template working and get by these two errors? I don't know enough about linked lists to know what I can and can't mess with here to get it working. The professor recommended that I try using 'printf' instead of 'cout' for those two statements, but I don't know how to achieve the same effect (how to do whatever 'setw' does) using 'printf'. Can anyone please help me get this template working? Thank you very, very much.
For reference, here is the full code from all three files that make up the template:
linkedlist.h (header file):
#ifndef LINKED_LINKED_H
#define LINKED_LINKED_H
struct NODE
string name;
int test_grade;
NODE * link;
class Linked_List
public:
Linked_List();
void insert(string n, int score);
void remove(string target);
void print_list();
private:
bool isEmpty();
NODE *FRONT_ptr, *REAR_ptr, *CURSOR, *INSERT, *PREVIOUS_ptr;
#endif
linkedlist.cpp (source file):
#include <iostream>
using namespace std;
#include "linkedlist.h"
LinkedList::LinkedList()
FRONT_ptr = NULL;
REAR_ptr = NULL;
PREVIOUS_ptr = NULL;
CURSOR = NULL;
void Linked_List::insert(string n, int score)
INSERT = new NODE;
if(isEmpty()) // first item in List
// collect information into INSERT NODE
INSERT-> name = n;
// must use strcpy to assign strings
INSERT -> test_grade = score;
INSERT -> link = NULL;
FRONT_ptr = INSERT;
REAR_ptr = INSERT;
else // else what?? When would this happen??
// collect information into INSERT NODE
INSERT-> name = n; // must use strcpy to assign strings
INSERT -> test_grade = score;
REAR_ptr -> link = INSERT;
INSERT -> link = NULL;
REAR_ptr = INSERT;
void LinkedList::printlist( )
// good for only a few nodes in a list
if(isEmpty() == 1)
cout << "No nodes to display" << endl;
return;
for(CURSOR = FRONT_ptr; CURSOR; CURSOR = CURSOR-> link)
{ cout << setw(8) << CURSOR->name; } cout << endl; // error: 'setw' was not declared in this scope
for(CURSOR = FRONT_ptr; CURSOR; CURSOR = CURSOR-> link)
{ cout << setw(8) << CURSOR->test_grade; } cout << endl; // error: 'setw' was not declared in this scope
void Linked_List::remove(string target)
// 3 possible places that NODES can be removed from in the Linked List
// FRONT
// MIDDLE
// REAR
// all 3 condition need to be covered and coded
// use Trasversing to find TARGET
PREVIOUS_ptr = NULL;
for(CURSOR = FRONT_ptr; CURSOR; CURSOR = CURSOR-> link)
if(CURSOR->name == target) // match
{ break; } // function will still continue, CURSOR will
// mark NODE to be removed
else
{ PREVIOUS_ptr = CURSOR; } // PREVIOUS marks what NODE CURSOR is marking
// JUST before CURSOR is about to move to the next NODE
if(CURSOR == NULL) // never found a match
{ return; }
else
// check each condition FRONT, REAR and MIDDLE
if(CURSOR == FRONT_ptr)
// TARGET node was the first in the list
FRONT_ptr = FRONT_ptr -> link; // moves FRONT_ptr up one node
delete CURSOR; // deletes and return NODE back to free memory!!!
return;
}// why no need for PREVIOUS??
else if (CURSOR == REAR_ptr) // TARGET node was the last in the list
{ // will need PREVIOUS for this one
PREVIOUS_ptr -> link = NULL; // since this node will become the last in the list
REAR_ptr = PREVIOUS_ptr; // = REAR_ptr; // moves REAR_ptr into correct position in list
delete CURSOR; // deletes and return NODE back to free memory!!!
return;
else // TARGET node was the middle of the list
{ // will need PREVIOUS also for this one
PREVIOUS_ptr -> link = CURSOR-> link; // moves PREV nodes' link to point where CURSOR nodes' points
delete CURSOR; // deletes and return NODE back to free memory!!!
return;
bool Linked_List::isEmpty()
if ((FRONT_ptr == NULL) && (REAR_ptr == NULL))
{ return true; }
else
{ return false;}
llmain.cpp (main source file):
#include <iostream>
#include <string>
#include <iomanip>
using namespace std;
#include "linkedlist.h"
int main()
Linked_List one;
one.insert("Angela", 261);
one.insert("Jack", 20);
one.insert("Peter", 120);
one.insert("Chris", 270);
one.print_list();
one.remove("Jack");
one.print_list();
one.remove("Angela");
one.print_list();
one.remove("Chris");
one.print_list();
return 0;setw is the equivalent of the field width value in printf. In your code, the printf version would look like:
printf("%8s", CURSOR->name.c_str());
I much prefer printf over any I/O formatting in C++. See the printf man page for more information. I recommend using Bwana: http://www.bruji.com/bwana/
I do think it is a good idea to verify your code on the platform it will be tested against. That means Visual Studio. However, you don't want to use Visual Studio. As you have found out, it gets people into too many bad habits. Linux is much the same way. Both development platforms are designed to build anything, whether or not it is syntactically correct. Both GNU and Microsoft have a long history of changing the language standards just to suit themselves.
I don't know what level you are in the class, but I have a few tips for you. I'll phrase them so that they answers are a good exercise for the student
* Look into const-correctness.
* You don't need to compare a bool to 1. You can just use bool. Plus, any integer or pointer type has an implicit cast to bool.
* Don't reuse your CURSOR pointer as a temporary index. Create a new pointer inside the for loop.
* In C++, a struct is the same thing as a class, with all of its members public by default. You can create constructors and member functions in a struct.
* Optimize your function arguments. Pass by const reference instead of by copy. You will need to use pass by copy at a later date, but don't worry about that now.
* Look into initializer lists.
* In C++ NULL and 0 are always the same.
* Return the result of an expression instead of true or false. Technically this isn't officially Return Value Optimization, but it is a good habit.
Of course, get it running first, then make it fancy. -
I developed one custom Report, which will print on pre print stationary. Really Problem here is when i send to printer it will printer properly on 8/12 By 11 Page, but i don't what is the reason it is not printing on Page after 7 Inch, even i thought i increase layout width it dos't Print after 7 Inch on Page, can i know why it is doing like these, any clue, please let me know.
Report Verions : 6i
Main Section : Width => 8.5
Height => 12.5
Orientation => Portrait
Report Width => 80
Report Height => 90
Your Help Rally appreicate in advance.
Thanks,
PraveenYou may need to contact support and actually show them the report to really solve the problem, but here are a few things to check first:
a) Check the report margins, make sure that they will allow the report body to display past 7".
b) Check that the frames and repeating frames are set to horizontally variable, or expand so that they can grow if required.
Hope this helps,
Danny -
9i Developer suite login problem. help needed ASAP
i installed oracle 9i developer suite, my problem is i can't login. this is the error ora12560: TNS: oracle adapter error.
or
if i put the hostname it displays a no listener error and closes. i tried to create a listener in net configuration assistant, but i can't see it in services.
i'm using windows XP. and not conneted to any machine.
do i need any changes on my window settings?
please help...
thanks
here is my listener.ora
ABC =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = abc)(PORT = 1521))
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = abc)(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\OraHome)
(PROGRAM = extproc)
tnsnames.ora
TEST.ABC =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = ABC)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = test.ABC)
ORACLE =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = abc)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = oracle)check your operating system network protocole is TCP/IP is installed if so check is there any problem with these protocoles. this error is encounter generally due operating system network protocoles it is not an oracle error. here is discription.
TNS-12560 TNS:protocol adapter error
Cause: A generic protocol adapter error occurred.
Action: Check addresses used for proper protocol specification. Before reporting this error, look at the error stack and check for lower level transport errors.For further details, turn on tracing and re-execute the operation. Turn off tracing when the operation is complete. -
( jrew.exe encounterd problem,help needed )
MY DEARS
I AM FACING A PROBLEM ON MY P4 LAPTOP AND DESKTOP COMPUTOR ON A PRGRAMM ON SURGERY CD ,WHICH ON START UP DIPLAYS MESSAGE ( jrew encountered a problem,needs to close-)
WHAT IS THE SOLUTION .HELP IS APPERECIATED.
MANY REGARDS FOR HELPER.
DR QAMARHi Jamie,
The install log looks fine, but the last entry was September 9th. I suspect the crash is occuring before the new log entries can be made.
Could you please open a new bug report on this over at bugbase.adobe.com? We'll want to get a crash dump so we can try to figure out what might be causing this to happen. You didn't mention what OS you were running, but I found this tech doc on the net that describes how do generate the .dmp file:
Creating Dr. Watson crash dumps
Thanks,
Chris
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