SWING - WindowAdapter Class

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Introduction

The class WindowAdapter is an abstract (adapter) class for receiving window events. All methods of this class are empty. This class is convenience 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

Sr.No.	Constructor & Description
1	WindowAdapter()

Class Methods

Sr.No.	Method & Description
1	void windowActivated(WindowEvent e) Invoked when a Window is activated.
2	void windowClosed(WindowEvent e) Invoked when a Window has been closed.
3	void windowClosing(WindowEvent e) Invoked when a Window is in the process of being closed.
4	void windowDeactivated(WindowEvent e) Invoked when a Window is de-activated.
5	void windowDeiconified(WindowEvent e) Invoked when a Window is de-iconified.
6	void 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.
7	void windowIconified(WindowEvent e) Invoked when a Window is iconified.
8	void 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.
9	void windowOpened(WindowEvent e) Invoked when a Window has been opened.
10	void 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:/ > SWING > com > tutorialspoint > gui >

SwingAdapterDemo.java

package com.tutorialspoint.gui;

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

public class SwingAdapterDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;

   public SwingAdapterDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
      SwingAdapterDemo  swingAdapterDemo = new SwingAdapterDemo();        
      swingAdapterDemo.showWindowAdapterDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));

      headerLabel = new JLabel("",JLabel.CENTER );
      statusLabel = new JLabel("",JLabel.CENTER);        
      statusLabel.setSize(350,100);
      
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      controlPanel = new JPanel();
      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");      
      JButton okButton = new JButton("OK");
      final JFrame aboutFrame = new JFrame();
      aboutFrame.setSize(300,200);;
      aboutFrame.setTitle("WindowAdapter Demo");
      
      aboutFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            aboutFrame.dispose();
         }        
      });    
      JLabel msglabel 
         = new JLabel("Welcome to TutorialsPoint SWING Tutorial.",JLabel.CENTER);
	   aboutFrame.add(msgLabel);
      aboutFrame.setVisible(true);
   }
}

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

D:\SWING>javac com\tutorialspoint\gui\SwingAdapterDemo.java

If no error occurs, it means the compilation is successful. Run the program using the following command.

D:\SWING>java com.tutorialspoint.gui.SwingAdapterDemo

Verify the following output.