AWT » Panel類

Panel類

類面板是最簡單的容器類。它提供了空間，在其中一個應用程式可以附加任何其他元件，包括其他面板。它使用的FlowLayout預設布局manager.

類的宣告

以下是宣告的java.awt.Panel類：

public class Panel
   extends Container
      implements Accessible

類別建構函式

S.N. 建構函式與說明
1 Panel() 
Creates a new panel using the default layout manager.
2 Panel(LayoutManager layout) 
Creates a new panel with the specified layout manager.

類方法

S.N. 方法及說明
1 void addNotify() 
Creates the Panel's peer.
2 AccessibleContext getAccessibleContext() 
Gets the AccessibleContext associated with this Panel.

繼承的方法

This class inherits methods from the following classes:

  • java.awt.Container

  • java.awt.Component

  • java.lang.Object

Panel Example

Create the following java program using any editor of your choice in say D:/ > AWT > com > yiibai > gui >

AwtContainerDemo 
package com.yiibai.gui;

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

public class AwtContainerDemo {
   private Frame mainFrame;
   private Label headerLabel;
   private Label statusLabel;
   private Panel controlPanel;
   private Label msglabel;

   public AwtContainerDemo(){
      prepareGUI();
   }

   public static void main(String[] args){
      AwtContainerDemo  awtContainerDemo = new AwtContainerDemo();          
      awtContainerDemo.showPanelDemo();
   }

   private void prepareGUI(){
      mainFrame = new Frame("Java AWT 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 Label();
      headerLabel.setAlignment(Label.CENTER);
      statusLabel = new Label();        
      statusLabel.setAlignment(Label.CENTER);
      statusLabel.setSize(350,100);
   
      msglabel = new Label();
      msglabel.setAlignment(Label.CENTER);
      msglabel.setText("Welcome to TutorialsPoint AWT Tutorial.");

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

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }

   private void showPanelDemo(){
      headerLabel.setText("Container in action: Panel");      

      Panel panel = new Panel();
      panel.setBackground(Color.magenta);
      panel.setLayout(new FlowLayout());        
      panel.add(msglabel);

      controlPanel.add(panel);

      mainFrame.setVisible(true);  
   }
}

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

D:AWT>javac comyiibaiguiAwtContainerDemo.java

If no error comes that means compilation is successful. Run the program using following command.

D:AWT>java com.yiibai.gui.AwtContainerDemo

Verify the following output

AWT Panel