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  The Local Inner program
The Local Inner program
The LocalInner program is a minimal window program. The LocalInner constructor declares a local inner class named WindowHandler, which is used to handle the WindowEvent that is generated when the user attempts to close the window.
The WindowHandler class is a small class that is created and used within the scope that it is needed.
The LocalInner program 
import java.awt.*;
import java.awt.event.*;

class LocalInner extends Frame {
  public static void main(String[] args) {
    new LocalInner();
  }
  LocalInner() {
    class WindowHandler extends WindowAdapter {
    public void windowClosing(WindowEvent e) {
      System.exit(0);
    }
  }
        addWindowListener(new WindowHandler());
        pack();
        setSize(400,400);
        show();
       }
      }
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