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Aymen++

03-17-2003 11:14 AM

problem in java

i have the following code:

Code:

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

import java.net.*;



public class Revolve extends Applet {

     String[] pageTitle = new String[6];

     URL[] pageLink = new URL[6];

     int current = 0;

     Thread runner;



     public void init() {

         Color background = new Color(255, 255, 204);

         setBackground(background);

         Button goButton = new Button("Go");

         goButton.addActionListener(this);

         add(goButton);

      }

 }

but when i excute it in JCreator the following error appears:
addActionListener(java.awt.event.ActionListener) in java.awt.Button cannot be applied to (Revolve)
why?

Josh Campbell

03-17-2003 05:14 PM

The object that listens for action must implement ActionListerner, your applet does not.

Aymen++

03-17-2003 05:25 PM

how can i solve it?

Spookster

03-17-2003 07:19 PM

As Josh just said if you want to use the addActionListener method you need to implement the ActionListener class.

public class Revolve extends Applet implements ActionListener {

}

Josh Campbell

03-17-2003 08:52 PM

And you must define all the methods in the ActionListener interface. I think theres only one (I could be wrong) but its:

public void actionPerformed(ActionEvent evt);

if I'm not mistaken.

Spookster

03-17-2003 09:32 PM

Yes you must also define that method. Something like this for example:

PHP Code:


		
			


    public void actionPerformed(ActionEvent event){

      String menuItemName = event.getActionCommand();



        if(menuItemName.equals("Quit")){

            System.exit(0);

        }



        else if(menuItemName.equals("Circle")){

            whichShape = 0;

        }

        else if(menuItemName.equals("Square")){

            whichShape = 1;

        }

        else if(menuItemName.equals("Rectangle")){

            whichShape = 2;

        }

        else if(menuItemName.equals("Arc")){

            whichShape = 3;

        }

    }

Spookster

03-17-2003 09:53 PM

Or in your case since you have a button you could define it like so:

PHP Code:


		
			
public void actionPerformed(ActionEvent event){

        if(event.getSource() instanceof Button){

            Button clickedButton = (Button) event.getSource();

            if(clickedButton == goButton){

                //Action to perform when go button clicked

            }

         }

}

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