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

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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.

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".

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;
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        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.

Cannot find class JPanel

Hi,
Im trying to use swing for almost the first time.
I changed my system to Linux and installed J2sdk 1.4.
When I write a class
e.g.
import javax.swing.*;
import java.awt.*;
etc...
class Test extends JPanel {
I receive an error message "Cannot find class "JPanel""
Can anyone help ? Maybe I didnt install the right thing ?
Thanks
Ulrike

you sure reinstall and overwrite your current sdk. Do you have the runtime environment installed too -- should come with the sdk

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null

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I am trying to run standard page from JDev and i am getting below error from EOImpl.java.
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Hi Scott,
Not sure wht you wanted me to try...
I have something like this in the code which is causing that error..
BusinessEvent businessevent = new BusinessEvent(s1, s2);
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businessevent.setStringProperty("pLeadId", getLeadId().toString());
java.sql.Connection connection1 = oadbtransaction.getJdbcConnection();
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The compiler claims it cannot find class FileNotFoundException or any other exception in my Main. Any packages I import has no problem. My structure:
java \ myMain \ Main.java
java \ com \ myName \ packages //no, the space is just there as visual help:)
Use javac -classpath java\ @compile.file
...where compile.file is a txt file giving the paths and filenames to all files I include.
This is first time I use the -classpath parameter, but I believed java.lang always was included. What Am I doing wrong.
regards
JT

You should review the tool documentation for the javac command and its use of classpath.
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Here is a clip about its use of the classpath.
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Extracted from Sun's website,
* Error Message: "Exception in thread NULL" or
"Unable to initialize threads: cannot find class java/lang/Thread"
If you are getting one of these fatal error messages when running java,
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-- Sudha

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Hi,
I'm developing a application for a windows ce v.2.11, and I've installed in my PDA (MIPS) Personal Java. The samples of Personal Java run perfectly. I've create a simple new class (Hello.class) with Sun One Studio, then I copy this file (Hello.class) in my pda, and when I run the application I saw this messages: "Cannot find class Hello".
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Thanks

Please see my reply to your latest post.

Javax.swing.JOptionPane

im a new programmer and i just downloaded ready to program with java and i need to import javax.swing.JOptionPane but it says it dosnt exists where can i go to get it ?
ty for your help in advance.

im using READY TO PROGRAM with java i unno what jdk that is sorry but umm here is the error meassage when i try to compile it.
javax/swing/JOptionPane is either a misplaced package name or a non-existent entity. When i use this exact code at my schools computers it seems to work fine. so i unno ty for your help all

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Oracle JDeveloper 10g 10.1.3.3
Copyright 1997, 2007 Oracle. All Rights Reserved
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Ian

Error:Cannot find class

Hi
I compile my application correctly, but when I copy this application in my PDA, and run this application (Hello.class) with Personal Java I saw a this message: Cannot find class Hello.class.
I don't compile javacheck before copy in my PDA the application.
Please help me

Hi,
are you sure that your classpath is set correct?
For checking this you'll need a registry editor and check the command that is entered for the .class file extensions.
Have a nice day,
FReAK

Cannot find class javax.swing.JOptionPane

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