SWING - JWindow Class

Introduction

The class JWindow is a container that can be displayed but does not have the title bar or window-management buttons.

Class Declaration

Following is the declaration for javax.swing.JWindow class −

public class JWindow
   extends Window
      implements Accessible, RootPaneContainer

Field

Following are the fields for java.awt.Component class −

• protected AccessibleContext accessibleContext − The accessible context property.

• protected JRootPane rootPane − The JRootPane instance that manages the contentPane and optional menuBar for this frame, as well as the glassPane.

• protected boolean rootPaneCheckingEnabled − If true then calls to add and setLayout will be forwarded to the contentPane.

Class Constructors

Class Methods

Methods Inherited

This class inherits methods from the following classes −

• java.awt.Window
• java.awt.Container
• java.awt.Component
• java.lang.Object

JWindow Example

Create the following Java program using any editor of your choice in say D:/ > SWING > com > tutorialspoint > gui >

SwingContainerDemo.java

package com.tutorialspoint.gui;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

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

   public SwingContainerDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
      SwingContainerDemo  swingContainerDemo = new SwingContainerDemo();  
      swingContainerDemo.showJWindowDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java Swing 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 JLabel("", JLabel.CENTER);        
      statusLabel = new JLabel("",JLabel.CENTER);    
      statusLabel.setSize(350,100);

      msglabel = new JLabel("Welcome to TutorialsPoint SWING Tutorial.", JLabel.CENTER);

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

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private void showJWindowDemo(){
      headerLabel.setText("Container in action: JWindow");   
      final MessageWindow window = new MessageWindow(
         mainFrame, "Welcome to TutorialsPoint SWING Tutorial.");

      JButton okButton = new JButton("Open a Window");
      okButton.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            window.setVisible(true);
            statusLabel.setText("A Window shown to the user."); 
         }
      });
      controlPanel.add(okButton);
      mainFrame.setVisible(true);  
   }
   class MessageWindow extends JWindow{
      private String message; 
      public MessageWindow(JFrame parent, String message) { 
         super(parent);               
         this.message = message; 
         setSize(300, 300);       
         setLocationRelativeTo(parent);         
      }
      public void paint(Graphics g) { 
         super.paint(g);
         g.drawRect(0,0,getSize().width - 1,getSize().height - 1); 
         g.drawString(message,50,150); 
      } 
   }
}

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

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

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

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

Verify the following output.