Javax.swing.InputVerifier

javax.swing.InputVerifier isa abstract class and it has an abstract method
public abstract boolean verify(JComponent arg);
i like to overload this method by
public abstract boolean verify(Component arg, int x, int y);
Is overloading is possible. if so give me a suggestion for it.
thank you..

if so give me a suggestion for it.search the forums (particularly the swing forum) for
"extends InputVerifier"
you'll probably find a number of examples

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Cannot find class javax.swing.JOptionPane

Hello,
I imported the class
import javax.swing.JOptionPane;and written as a first line of my code in the form of a .java file.
but error occurs as : cannot find the class javax.swing.JOptionPane. What should I do.
Thank you.

Are you doing something likeimport javax.swing.JOptionPane;
class Test {
    public static void main(String args[]) {
        JOptionPane.showMessageDialog(null, "Testing",
                "Testing", JOptionPane.INFORMATION_MESSAGE);
}Mark

Multiple Fonts in a javax.swing.JTextPane

I am trying to use multiple fonts in a JTextPane, but can only find ways of changing the font family used. Can anyone give me any pointers on how to do this, or a document somewhere that explains, either way with out going into the javax.swing.text.html, javax.swing.text.html.parser or java.awt.font packages.
Any information that can be provided would be appreciated.
Thanks,
Nathan

Just use SimpleAttributeSet like :
SimpleAttributeSet defaultSet = new SimpleAttributeSet();
        StyleConstants.setForeground( defaultSet, Color.BLACK );
        StyleConstants.setFontFamily( defaultSet, "Verdana" );
        StyleConstants.setFontSize( defaultSet, 14 );
        SimpleAttributeSet navigationSet = new SimpleAttributeSet();
        StyleConstants.setForeground( navigationSet, new Color(00, 99, 00) );
        StyleConstants.setBold( navigationSet, true );
        StyleConstants.setFontFamily( navigationSet, "Verdana" );
        StyleConstants.setFontSize( navigationSet, 11 );
// just defiine endPoints what ever you want
((DefaultStyledDocument)textPane.getDocument()).setCharacterAttributes(0, endPoint1, defaultSet , true)
((DefaultStyledDocument)textPane.getDocument()).setCharacterAttributes(0, endPoint2, navigation , true)

Variable textArea not found in class javax.swing.JFrame...

Making progress on this issue -- but still stuck. Again trying to get the text from a JTextArea on exit:
        frame.addWindowListener
       (new WindowAdapter() {
         public void windowClosing(WindowEvent e)
            System.out.println("Why me???" + frame.textArea.getText());
        });User MARSIAN helped me understand the scope fo the variables and now that has been fixed. Unfortunately I cannot access my variable textArea in the above code. If get this error:
Error: variable textArea not found in class javax.swing.JFrame
What am I doing wrong?
import java.net.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import FragImpl.*;
public class Framework extends WindowAdapter {
    public int numWindows = 0;
    private Point lastLocation = null;
    private int maxX = 500;
    private int maxY = 500;
    JFrame frame;
    public Framework() {
        newFrag();
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        maxX = screenSize.width - 50;
        maxY = screenSize.height - 50;
        makeNewWindow();
    public void makeNewWindow() {
        frame = new MyFrame(this); //*
        numWindows++;
        System.out.println("Number of windows: " + numWindows);
        if (lastLocation != null) {
            //Move the window over and down 40 pixels.
            lastLocation.translate(40, 40);
            if ((lastLocation.x > maxX) || (lastLocation.y > maxY)) {
                lastLocation.setLocation(0, 0);
            frame.setLocation(lastLocation);
        } else {
            lastLocation = frame.getLocation();
        System.out.println("Frame location: " + lastLocation);
        frame.setVisible(true);
        frame.addWindowListener
       (new WindowAdapter() {
         public void windowClosing(WindowEvent e)
            System.out.println("Why me???" + frame.textArea.getText());
    //This method must be evoked from the event-dispatching thread.
    public void quit(JFrame frame) {
        if (quitConfirmed(frame)) {
            System.exit(0);
        System.out.println("Quit operation not confirmed; staying alive.");
    private boolean quitConfirmed(JFrame frame) {
        String s1 = "Quit";
        String s2 = "Cancel";
        Object[] options = {s1, s2};
        int n = JOptionPane.showOptionDialog(frame,
                "Windows are still open.\nDo you really want to quit?",
                "Quit Confirmation",
                JOptionPane.YES_NO_OPTION,
                JOptionPane.QUESTION_MESSAGE,
                null,
                options,
                s1);
        if (n == JOptionPane.YES_OPTION) {
            return true;
        } else {
            return false;
     private void newFrag()
          Frag frag = new FragImpl();
    public static void main(String[] args) {
        Framework framework = new Framework();
class MyFrame extends JFrame {
    protected Dimension defaultSize = new Dimension(200, 200);
    protected Framework framework = null;
    private Color color = Color.yellow;
    private Container c;
    JTextArea textArea;
    public MyFrame(Framework controller) {
        super("New Frame");
        framework = controller;
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setSize(defaultSize);
        //Create a text area.
        textArea = new JTextArea(
                "This is an editable JTextArea " +
                "that has been initialized with the setText method. " +
                "A text area is a \"plain\" text component, " +
                "which means that although it can display text " +
                "in any font, all of the text is in the same font."
        textArea.setFont(new Font("Serif", Font.ITALIC, 16));
        textArea.setLineWrap(true);
        textArea.setWrapStyleWord(true);
        textArea.setBackground ( Color.yellow );
        JScrollPane areaScrollPane = new JScrollPane(textArea);
        //Create the status area.
        JPanel statusPane = new JPanel(new GridLayout(1, 1));
        ImageIcon icoOpen = null;
        URL url = null;
        try
            icoOpen = new ImageIcon("post_it0a.gif"); //("doc04d.gif");
        catch(Exception ex)
            ex.printStackTrace();
            System.exit(1);
        setIconImage(icoOpen.getImage());
        c = getContentPane();
        c.setBackground ( Color.yellow );
        c.add ( areaScrollPane, BorderLayout.CENTER ) ;
        c.add ( statusPane, BorderLayout.SOUTH );
        c.repaint ();
}

Yeah!!! It works. Turned out to be a combination of DrKlap's and Martisan's suggestions -- had to change var frame's declaration from JFrame to MyFrame:
    MyFrame frame;Next, created the external class -- but again changed JFrame references to MyFrame:
public class ShowOnExit extends WindowAdapter {
//   JFrame aFrame;
   MyFrame aFrame;
   public ShowOnExit(MyFrame f) {
      aFrame = f;
   public void windowClosing(WindowEvent e)
      System.out.println("Why me???" + aFrame.textArea.getText()); // aFrame here not frame !!!
}This worked. So looks like even though the original code added a WindowListener to 'frame', the listener didn't couldn't access frame's methods unless it was explicitly passed in as a parameter. Let me know if that's wrong.
Thanks again, all.

Import javax.swing.*;

I start my programm with:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import rechenwerk.Rechenwerk; import rechenwerk.RechenwerkFassade;
import zahl.Zahl; import zahl.ZahlFassade;
import oberflaeche.Oberflaeche;
At "import javax.swing.*" i get the failure message from the compiler:
Oktalrechner.java:8: Package javax.swing not found in import.
import javax.swing.*;
What is wrong? I don't know-please help me.
I'm using JDK1.2BETA4

Tell me when you execute java -version, what you are getting?
Looks like you are suing old JDK.
Download the latest public release JDK1.4 from http://java.sun.com
/Sreenivasa Kumar Majji.
Did somebody help you? I have a similar problem with
javax.resource... :(
I start my programm with:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import rechenwerk.Rechenwerk; import
rechenwerk.RechenwerkFassade;
import zahl.Zahl; import zahl.ZahlFassade;
import oberflaeche.Oberflaeche;
At "import javax.swing.*" i get the failure message
from the compiler:
Oktalrechner.java:8: Package javax.swing not foundin
import.
import javax.swing.*;
What is wrong? I don't know-please help me.
I'm using JDK1.2BETA4

Javax.swing.tree.DefaultMutableTreeNode

I have a tree with some nodes in it.
I am using setAllowsChildren(boolean x) method of javax.swing.tree.DefaultMutableTreeNode on the nodes.
But the problem i m facing is
1....if setAllowsChildren() method returns true ,i m getting tree icon displayed on side of node(irrespective of whether the node has children or not )
I m facing with a challenge of allowing node to have children by using
setAllowsChildren(true) and at the same time display tree icon only when children are present.
Some of my friends say it is a java bug.
If not how do i go about solving this one.
Thanks in advance

Ok i will put it in another way.
Is there any other way by which the tree icon can be made to display
without the usage of[b] setAllowsChildren() method

Import javax.swing.JOptionPane

hello
i just installed j2sdk1.3.1 into my redhat linux7.3, during installation, everything's fine...
but when i start to compile a program with some import classes...i face the problem :
cannot find type "javax/swing/JOptionPane
this is my program :
import javax.swing.JOptionPane;
public class Welcome{
public static void main(String args[])
JOptionPane.showMessageDialog(null,"Hello");
System.exit(0);
can anybody help me with this problem......?...thanks

type
java -versionto see which version of the JVM you are running
you could also try
which javato see the actuall executable that you are running.

Javax.swing.filechooser.FileFilter

Does anybody know why javax.swing.filechooser.FileFilter is an abstract class
instead of an interface extending java.io.FileFilter ?
Gordan

Yeh - and while we are on the subject, why doesnt it implement java.io.FileFilter so you can use the same filter for the filechooser as you do for listing files? </bangheadagainstwall>

UIManager.look and feel buttons or javax.swing

Hey,
i want to use the ok, cancel etc. button that you get in a JFileChooser or a JOptionPane.
Can they be found in the UIManager or in the javax.swing?
i tried to extract them from the JFileChooser by:
JFileChooser chooser = new JFileChooser("/"); //Linux
JPanel mypanel = new JPanel();
mypanel.add(chooser.getComponentAt(2)); //the button panelthis works, but i don't know how to overwrite the actionlistener to make the buttons listen to my actionlistener.
thanks in advance
Grad_

It returns an int value according to what button was clicked
http://72.5.124.55/docs/books/tutorial/uiswing/components/filechooser.html
http://java.sun.com/developer/JDCTechTips/2004/tt0316.html

Import javax.swing problems

hey
I am new to java and have recently downloaded j2sdk1.4.2_04. I am trying to create a simple graphical application. However, It doesnt seem to import the javax.swing.* libraries. I understand that there is the src.zip in the directory, so I unzipped it but it still doesn't read the package. I read elsewhere on this forum that you should set the path to src.zip. I have tried that and it also doesnt work. My current path is:
PATH=C:\j2sdk1.4.2_04\lib\src.zip;C:\j2sdk1.4.2_04\bin
Is there an error in this, or what else should I try? All suggestions greatly appreciated.

There's no need to set your classpath when importing any of the standard packages that are provided by the JDK. Perhaps you could post a (small) code sample and the compiler error you are getting.

Javax.swing.JPanel Help

my application is sort of a game, i planned on having a JPanel subclass called EventPanel have an instance variable _curPanel.
curPanel is of type JPanel. In the constructor I can set curPanel to Other JPanel subclasses. I have another subclass of JPanel called MainScreen, which has the main screen for the game.
I can set curPanel = new MainScreen(); in the constructor for eventPanel. And it works.
But if I try to change _curPanel after i've made it, it wont show up. I have a method which signature
void setPanel(javax.swing.JPanel panel)
    _curPanel = panel;
    repaint();
}to change the EventPanel, but nothing changes.
In the MainScreen class there is a method call
_eventPanel.setPanel(new NewPlayerPanel());and nothing changes in the code. I have a JTextArea logging info, and in the constructor for NewPlayerPanel at the end it prints a message in my JTextArea. The Panel is being created but not showing up.
I have also tried creating the panel in an instance variable, setting it to setVisbile(true) and trying again and it doesnt work.

In other words...
char c=evt.getKeyChar();c is some character based on this event.
if(c=='1'){Ok, let's say it is '1'...
...> char c2=evt.getKeyChar();Then c2 is also '1'.evt.getKeyChar() isn't going to magically change to be something different than it returned when you called it a few lines up before, so...>if(c2=='a')...this can never be true, given the above.

Javax.swing.text.TableView bug in 1.4 beta 2 ?

Hi,
I derived a class from TableView, which worked fine with 1.3, but now causes the following exception as soon as being layouted:
java.lang.Error: should not happen: class com.lexetius.swing.text.LexTableView
at javax.swing.text.BoxView.baselineLayout(Unknown Source)
at javax.swing.text.ParagraphView$Row.layoutMinorAxis(Unknown Source)
at javax.swing.text.BoxView.setSpanOnAxis(Unknown Source)
at javax.swing.text.BoxView.layout(Unknown Source)
at javax.swing.text.BoxView.setSize(Unknown Source)
at javax.swing.text.BoxView.updateChildSizes(Unknown Source)
at javax.swing.text.BoxView.setSpanOnAxis(Unknown Source)
at javax.swing.text.BoxView.layout(Unknown Source)
at javax.swing.text.FlowView.layout(Unknown Source)
at javax.swing.text.BoxView.setSize(Unknown Source)
at javax.swing.text.BoxView.updateChildSizes(Unknown Source)
at javax.swing.text.BoxView.setSpanOnAxis(Unknown Source)
at javax.swing.text.BoxView.layout(Unknown Source)
at javax.swing.text.BoxView.setSize(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI$RootView.setSize(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI.getPreferredSize(Unknown Source)
at javax.swing.JComponent.getPreferredSize(Unknown Source)
at javax.swing.JEditorPane.getPreferredSize(Unknown Source)
at javax.swing.ScrollPaneLayout.layoutContainer(Unknown Source)
at java.awt.Container.layout(Unknown Source)
at java.awt.Container.doLayout(Unknown Source)
at java.awt.Container.validateTree(Unknown Source)
at java.awt.Container.validate(Unknown Source)
at javax.swing.RepaintManager.validateInvalidComponents(Unknown Source)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknow
n Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
any ideas???

I wrote the com.lexetius.swing.text.LexTableView component myself. It is derived directly from javax.swing.text.TableView and it adds virtually no functionality. I'm quite sure, the problem comes from the TableView class, but I can't verify that directly, since this class is abstract (why is that, anyway??).
It would certainly help me very much, if anybody had a component, which is also derived from javax.swing.text.TableView and works with the 1.4 beta.

Import javax.swing.* error

Heya. I decided to learn java and i've been doing the tutorials, recently i started the swing tutorials and the learn by example page. However, whenever I try to import javax.swing.* it gives me an error. SO you know, i am using the J2SDK 1.4.2 and netbeans IDE 5.0. Here's the error text and what i type.
import javax.swing.* ;
the error is:
illegal start of expression and then sometimes i get <identifier> expected.
can anyone help me?

To update. I figured out how to do this with a blank start file in netbeans, however it's awful to have to delete main and then make a new class file. So, is there anyway to get a blank template project or to import javax.swing.* without having to delete main and start with a blank file? SO, i guess my question has changed, but it's still about an import javax.swing.* error.
thanks.

Cannot Import javax.swing.JOptionPane Please HELP!!!

import javax.swing.JOptionPane;
this line of code returns the error:
C:\Java Files\BankAccount\BankAccount_Test.java:1: Class javax.swing.JOptionPane not found in import.
import javax.swing.JOptionPane;
^
1 error
Process completed.
Please help, I don't know what the problem could be....

Swing was not part of any JDK's earlier than 1.2. Swing (or anything with a J in front of it, ie. JFrame, JOptionPane, etc...) was probably the most dramatic (if not largest) modification/addition to the Java language, that's why versions later than, and including, 1.2 are known as "Java 2".

Package javax.swing.event not found in import.

I'm receiving the above error message when compiling a Java application which begins with the following import statements:
* 1.1+Swing version.
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
My Classpath System variables are as follows:
C:\IBMCON~1\CICS\Classes\CTGCLI~1.JAR;.;C:\PROGRA~1\MQSeries\java\lib\COMIBM~2.JAR;C:\PROGRA~1\MQSeries\java\lib\COMIBM~1.JAR;C:\PROGRA~1\MQSeries\java\lib\COMIBM~3.JAR;C:\PROGRA~1\MQSeries\tools\javaclnt\samples\en_us;C:\Program Files\SQLLIB\java\db2java.zip;C:\Program Files\SQLLIB\java\runtime.zip;C:\Program Files\SQLLIB\bin;C:\Program Files\SQLLIB\java\SQLj.zip
I have Java(TM) 2 SDK, Standard Edition, Version 1.4.0 installed and am running Windows 2000.
I'd appreciate any ideas as to why this compiler error occurs. Thanks very much.

What error message?
As stated, looks like something's not where it's supposed to be.
Here's the search order of your classpath:
C:\IBMCON~1\CICS\Classes\CTGCLI~1.JAR
C:\PROGRA~1\MQSeries\java\lib\COMIBM~2.JAR
C:\PROGRA~1\MQSeries\java\lib\COMIBM~1.JAR
C:\PROGRA~1\MQSeries\java\lib\COMIBM~3.JAR
C:\PROGRA~1\MQSeries\tools\javaclnt\samples\en_us
C:\Program Files\SQLLIB\java\db2java.zip
C:\Program Files\SQLLIB\java\runtime.zip
C:\Program Files\SQLLIB\bin
C:\Program Files\SQLLIB\java\SQLj.zip

Javax.swing.InputVerifier

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