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AWT Panel Class

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Panel class

Introduction

The Panel class is the simplest container class. It provides space in which an application can attach any other component, including other panels. It uses FlowLayout as default layout manager.

Class declaration

Following is the declaration for java.awt.Panel class:

public class Panel
   extends Container
      implements Accessible

Class constructors

S.N.Constructor & Description
1Panel()Creates a new panel using the default layout manager.
2Panel(LayoutManager layout)Creates a new panel with the specified layout manager.

Class methods

S.N.Method & Description
1void addNotify()Creates the Panel’s peer.
2AccessibleContext getAccessibleContext()Gets the AccessibleContext associated with this Panel.

Methods inherited

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 > adglob > gui >AwtContainerDemo.java

package com.adglob.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 Adglob 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 com\adglob\gui\AwtContainerDemo.java

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

D:\AWT>java com.adglob.gui.AwtContainerDemo

Verify the following output

Panel class

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