ClassCastException

[paulsim]

Hi

It seems like there are thousands of people with this problem asking around on the Internet - and I don't find a decent reply.

I am trying to create a simple applet with JButtons

When compiling in JCreator I get the following message.

java.lang.ClassCastException: FramedButton cannot be cast to java.applet.Applet
at sun.applet.AppletPanel.createApplet(AppletPanel.ja va:786)
at sun.applet.AppletPanel.runLoader(AppletPanel.java: 715)
at sun.applet.AppletPanel.run(AppletPanel.java:369)
at java.lang.Thread.run(Thread.java:619)

When compiling with javax it compiles OK but does not initialise.

I have tried many examples of simple button demo applets including the one on the java site.

also this one which is similar but does not require gifs.


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ButtonDemo extends JFrame
{
protected JButton startButton, stopButton;

// Constructor sets features of the frame, creates buttons, adds them to the frame, and
// assigns an object to listen to them
public ButtonDemo()
{
super("Button demo"); // set title bar

setSize(400,200); // sets the size of the window

startButton = new JButton("Start"); // create two new buttons w/labels start and stop
stopButton = new JButton("Stop");

startButton.setBackground(Color.green); // set backgrounds of buttons
stopButton.setBackground(Color.red);

Container contentPane = getContentPane();
contentPane.setLayout(new FlowLayout()); // sets layout so objects added go from left to right
// until fill up row and then go to next row
contentPane.add(startButton);
contentPane.add(stopButton);

// create objects to listen to each button (separately):
startButton.addActionListener(new StartButtonListener());
stopButton.addActionListener(new StopButtonListener());
}


// Trivial main program associated with new window
public static void main(String[] main){
ButtonDemo app = new ButtonDemo(); // Create an instance of Buttons
app.show(); // Show it on the Mac screen
} // -- leave this out and you won't see it!

// Listener for start button
protected class StartButtonListener implements ActionListener{

// print "start button" when button pushed
public void actionPerformed(ActionEvent evt)
{
System.out.println("Start button");
}
}

// Listener for stop button
protected class StopButtonListener implements ActionListener{

// print "stop button" when button pushed
public void actionPerformed(ActionEvent evt)
{
System.out.println("Stop button");
}
}

}

I have read many short comments but no solutions.

Is my Java installed correctly?

I do have the classpath coorect to java.swing.

Please help me - and many others.

paulsim

[Eranga]

First of all, I have found something on your code. I can't see that you have extend the JApplet in order to implement an applet.

[Norm]

Having trouble understanding your problem.

Quote:

When compiling in JCreator I get the following message.

java.lang.ClassCastException: FramedButton cannot be cast to java.applet.Applet

This looks like an execution time error message, not a compile error.
Where is FramedButton defined? Its not in the code you posted.

Quote:

When compiling with javax

What is the javax program? Sun's java JDK uses javac to compile java programs.

Your code show a main() method. These are not used in Applets.