syntax and variable

[satellite03]

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Demo {

     static JFrame jframe = new JFrame("Example"); 



     public static void setupJFrame() {

          jframe.setSize(400,100);

          jframe.setVisible(true);

          jframe.setLayout( new FlowLayout() );



          WindowListener l = new WindowAdapter() { // line-1

               public void windowClosing(WindowEvent e) {

                    System.exit(0);}

          };

          jframe.addWindowListener(l);

     }



     public static void main(String[] args) {

          setupJFrame();

          JButton jb = new JButton("pressure");

          jframe.getContentPane().add( jb );

          jframe.setVisible(true);

     }

}

How can i write //line-1 inside a method ? look, thats not a variable . had it been a variable x,y,z etc we could write
int x=0;
int y=3;

but thats not a variable , so how can i write this way

 

[sedj]

That is a fairly standard way of attaching a WindowListener (in your case an anonymous class instance) - I don't see your problem.

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[Targol]

Here is a piece of code that works but Idon't know if it's realy what you asked :

public class Demo extends WindowAdapter{

     static JFrame jframe = new JFrame("Example");

     public void windowClosing(WindowEvent e) {
         System.exit(0);
     }


     public static void setupJFrame() {

          jframe.setSize(400,100);

          jframe.setVisible(true);

          jframe.setLayout( new FlowLayout() );

          jframe.addWindowListener(new Demo());

     }



     public static void main(String[] args) {

          setupJFrame();

          JButton jb = new JButton("pressure");

          jframe.getContentPane().add( jb );

          jframe.setVisible(true);

     }

}

Demo class extends WindowAdapter so you can add it as listener for your frame.

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