SWING: Containers JWindow Class Cheat Sheet - A quick cheatsheet for beginners, with examples

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.

# Constructors

`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.

# Methods

`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.

# Inherited

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

# JWindow Example

SwingContainerDemo.java

package com.simplecheatsheet.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); 
      } 
   }
}

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