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AWT WindowAdapter Class

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WindowAdapter 

Introduction

The class WindowAdapter is an abstract (adapter) class for receiving window events. All methods of this class are empty. This class is a convenient class for creating listener objects.

Class declaration

Following is the declaration for java.awt.event.WindowAdapter class:

public abstract class WindowAdapter
   extends Object
      implements WindowListener, WindowStateListener, WindowFocusListener

Class constructors

S.N.Constructor & Description
1WindowAdapter()

Class methods

S.N.Method & Description
1void windowActivated(WindowEvent e)Invoked when a window is activated.
2void windowClosed(WindowEvent e)Invoked when a window has been closed.
3void windowClosing(WindowEvent e)Invoked when a window is in the process of being closed.
4void windowDeactivated(WindowEvent e)Invoked when a window is de-activated.
5void windowDeiconified(WindowEvent e)Invoked when a window is de-iconified.
6void windowGainedFocus(WindowEvent e)Invoked when the Window is set to be the focused Window, which means that the Window, or one of its subcomponents, will receive keyboard events.
7void windowIconified(WindowEvent e)Invoked when a window is iconified.
8void windowLostFocus(WindowEvent e)Invoked when the Window is no longer the focused Window, which means that keyboard events will no longer be delivered to the Window or any of its subcomponents.
9void windowOpened(WindowEvent e)Invoked when a window has been opened.
10void windowStateChanged(WindowEvent e)Invoked when a window state is changed.

Methods inherited

This class inherits methods from the following classes:

  • java.lang.Object

WindowAdapter Example

Create the following java program using any editor of your choice in say D:/ > AWT > com > adglob> gui >AwtAdapterDemo.java

package com.adglob.gui;

import java.awt.*;
import java.awt.event.*;

public class AwtAdapterDemo {
   private Frame mainFrame;
   private Label headerLabel;
   private Label statusLabel;
   private Panel controlPanel;

   public AwtAdapterDemo(){
      prepareGUI();
   }

   public static void main(String[] args){
      AwtAdapterDemo  awtAdapterDemo = new AwtAdapterDemo();        
      awtAdapterDemo.showWindowAdapterDemo();
   }

   private void prepareGUI(){
      mainFrame = new Frame("Java AWT Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      headerLabel = new Label();
      headerLabel.setAlignment(Label.CENTER);
      statusLabel = new Label();        
      statusLabel.setAlignment(Label.CENTER);
      statusLabel.setSize(350,100);

      controlPanel = new Panel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }

   private void showWindowAdapterDemo(){
      headerLabel.setText("Listener in action: WindowAdapter");      

      Button okButton = new Button("OK");

      final Frame aboutFrame = new Frame();
      aboutFrame.setSize(300,200);;
      aboutFrame.setTitle("WindowAdapter Demo");
      aboutFrame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent windowEvent){
               aboutFrame.dispose();
         }        
      });    
      Label msgLabel = new Label("Welcome to Adglob.");
      msgLabel.setAlignment(Label.CENTER);
      msgLabel.setSize(100,100);
      aboutFrame.add(msgLabel);
      aboutFrame.setVisible(true);
   }
}

Compile the program using command prompt. Go to D:/ > AWT and type the following command.

D:\AWT>javac com\adglob\gui\AwtAdapterDemo.java

If no error comes that means compilation is successful. Run the program using following command.

D:\AWT>java com.adglob.gui.AwtAdapterDemo

Verify the following output

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