SWING - JWindow Class

The class JWindow is a container that can be displayed but does not have the title bar or window-management buttons.
Following is the declaration for javax.swing.JWindow class −
public class JWindow
   extends Window
      implements Accessible, RootPaneContainer

Following are the fields for java.awt.Component class −
protected AccessibleContext accessibleContext − The accessible context property.
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 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.
protected boolean rootPaneCheckingEnabled − If true then calls to add and setLayout will be forwarded to the contentPane.
JWindow()
Creates a window with no specified owner.
JWindow(Frame owner)
Creates a window with the specified owner frame.
JWindow(GraphicsConfiguration gc)
Creates a window with the specified GraphicsConfiguration of a screen device.
JWindow(Window owner)
Creates a window with the specified owner window.
JWindow(Window owner, GraphicsConfiguration gc)
Creates a window with the specified owner window and GraphicsConfiguration of a screen device.
protected void	addImpl(Component comp, Object constraints, int index)
Adds the specified child Component.
protected JRootPane createRootPane()
Called by the constructor methods to create the default rootPane.
AccessibleContext getAccessibleContext()
Gets the AccessibleContext associated with this JWindow.
Container getContentPane()
Returns the Container which is the contentPane for this window.
Component getGlassPane()
Returns the glassPane Component for this window.
Graphics getGraphics()
Creates a graphics context for this component.
JLayeredPane getLayeredPane()
Returns the layeredPane object for this window.
JRootPane getRootPane()
Returns the rootPane object for this window.
TransferHandler getTransferHandler()
Gets the transferHandler property.
protected boolean isRootPaneCheckingEnabled()
Returns whether calls to add and setLayout are forwarded to the contentPane.
protected String	paramString()
Returns a string representation of this JWindow.
void remove(Component comp)
Removes the specified component from the container.
void repaint(long time, int x, int y, int width, int height)
Repaints the specified rectangle of this component within time milliseconds.
void setContentPane(Container contentPane)
Sets the contentPane property for this window.
void setGlassPane(Component glassPane)
Sets the glassPane property.
void setLayeredPane(JLayeredPane layeredPane)
Sets the layeredPane property.
void setLayout(LayoutManager manager)
Sets the LayoutManager.
protected void setRootPane(JRootPane root)
Sets the new rootPane object for this window.
protected void setRootPaneCheckingEnabled(boolean enabled)
Sets whether calls to add and setLayout are forwarded to the contentPane.
void setTransferHandler(TransferHandler newHandler)
Sets the transferHandler property, which is a mechanism to support the transfer of data into this component.
void update(Graphics g)
Calls paint(g).
protected void windowInit()
Called by the constructors to init the JWindow properly.
This class inherits methods from the following classes −
java.awt.Window
java.awt.Container
java.awt.Component
java.lang.Object
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.

    30 Lectures 
     3.5 hours 

 Pranjal Srivastava

    13 Lectures 
     1 hours 

 Pranjal Srivastava

    25 Lectures 
     4.5 hours 

 Emenwa Global, Ejike IfeanyiChukwu

    14 Lectures 
     1.5 hours 

 Travis Rose

    14 Lectures 
     1 hours 

 Travis Rose
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