JWindow类是一个容器，可以显示，但不具有标题栏或窗口管理按钮。

类声明

以下是声明 javax.swing.JWindow类：

public class JWindow
   extends Window
      implements Accessible, RootPaneContainer

字段域

以下是java.awt.Component 类的字段：

• protected AccessibleContext accessibleContext -- 访问上下文属性。

• protected JRootPane rootPane -- JRootPane实例管理的contentPane和可选的菜单栏，以及该帧的玻璃面板。

• protected boolean rootPaneCheckingEnabled -- 如果为真（true）则调用添加的setLayout将被转发到contentPane。

类构造函数

S.N.	构造函数 & 描述
1	JWindow()  Creates a window with no specified owner.
2	JWindow(Frame owner)  Creates a window with the specified owner frame.
3	JWindow(GraphicsConfiguration gc) Creates a window with the specified GraphicsConfiguration of a screen device.
4	JWindow(Window owner)  Creates a window with the specified owner window.
5	JWindow(Window owner, GraphicsConfiguration gc)  Creates a window with the specified owner window and GraphicsConfiguration of a screen device.

类方法

S.N.	方法 & 描述
1	protected void addImpl(Component comp, Object constraints, int index)  Adds the specified child Component.
2	protected JRootPane createRootPane()  Called by the constructor methods to create the default rootPane.
3	AccessibleContext getAccessibleContext()  Gets the AccessibleContext associated with this JWindow.
4	Container getContentPane()  Returns the Container which is the contentPane for this window.
5	Component getGlassPane()  Returns the glassPane Component for this window.
6	Graphics getGraphics()  Creates a graphics context for this component.
7	JLayeredPane getLayeredPane()  Returns the layeredPane object for this window.
8	JRootPane getRootPane()  Returns the rootPane object for this window.
9	TransferHandler getTransferHandler()  Gets the transferHandler property.
10	protected boolean isRootPaneCheckingEnabled()  Returns whether calls to add and setLayout are forwarded to the contentPane.
11	protected String paramString()  Returns a string representation of this JWindow.
12	void remove(Component comp)  Removes the specified component from the container.
13	void repaint(long time, int x, int y, int width, int height)  Repaints the specified rectangle of this component within time milliseconds.
14	void setContentPane(Container contentPane)  Sets the contentPane property for this window.
15	void setGlassPane(Component glassPane)  Sets the glassPane property.
16	void setLayeredPane(JLayeredPane layeredPane)  Sets the layeredPane property.
17	void setLayout(LayoutManager manager)  Sets the LayoutManager.
18	protected void setRootPane(JRootPane root)  Sets the new rootPane object for this window.
19	protected void setRootPaneCheckingEnabled(boolean enabled)  Sets whether calls to add and setLayout are forwarded to the contentPane.
20	void setTransferHandler(TransferHandler newHandler)  Sets the transferHandler property, which is a mechanism to support transfer of data into this component.
21	void update(Graphics g)  Calls paint(g).
22	protected void windowInit()  Called by the constructors to init the JWindow properly.

方法继承

这个类从以下类继承的方法：

• java.awt.Window

• java.awt.Container

• java.awt.Component

• java.lang.Object

JWindow 例子

选择使用任何编辑器创建以下java程序在 D:/ > SWING > com > yiibai > gui >

SwingContainerDemo.java

package com.yiibai.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); 
      } 
   }
}

编译程序，使用命令提示符。到 D:/ > SWING 然后输出以下命令。

D:SWING>javac comyiibaiguiSwingContainerDemo.java

如果没有错误出现，这意味着编译成功。使用下面的命令来运行程序。

D:SWING>java com.yiibai.gui.SwingContainerDemo

验证下面的输出