Adding JPanel Inside Another JPanel

Program Description:

The program below is a Java Code, a simple demonstration on how add JPanel inside another JPanel which is very useful in making a complex program layout along the way. This technique can make you add as many JPanel you want inside another JPanel.

Output:

Code:

/**

 * File: jpanelInsideJPanel.java

 * Tiltle: Adding JPanel Inside Another JPanel

 * Author: http://java-code-complete.blogspot.com/

 */



//Java Core Package

import javax.swing.*;

//Java Extension Package

import java.awt.*;



public class jpanelInsideJPanel extends JFrame {

	

	//Initializing JPanels

	private JPanel mainPanel, subPanel1, subPanel2, subPanel3, subPanel4;



	//Setting up GUI

    public jpanelInsideJPanel(){



    	//Setting up the Title of the Window

    	super("Adding JPanel Inside Another JPanel");



    	//Set Size of the Window (WIDTH, HEIGHT)

    	setSize(350,250);



    	//Exit Property of the Window

    	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		

		//Constructing Main JPanel with GridLayout of 1 row and 2 column

    	mainPanel = new JPanel();

    	mainPanel.setBorder(BorderFactory.createTitledBorder("Main Panel"));

    	mainPanel.setLayout(new GridLayout(1,2));

    	

    	//Constructing JPanel 1 and 2 with GridLayout of 1 row and 1 column

    	subPanel1 = new JPanel();

    	subPanel1.setBorder(BorderFactory.createTitledBorder("Sub Panel 1"));

    	subPanel1.setLayout(new GridLayout(1,1));

    	subPanel2 = new JPanel();

    	subPanel2.setBorder(BorderFactory.createTitledBorder("Sub Panel 2"));

    	subPanel2.setLayout(new GridLayout(1,1));

    	

    	//Constructing JPanel 3 and 4

    	subPanel3 = new JPanel();

    	subPanel3.setBorder(BorderFactory.createTitledBorder("Sub Panel 3"));

    	subPanel4 = new JPanel();

    	subPanel4.setBorder(BorderFactory.createTitledBorder("Sub Panel 4"));

    	

    	//Adding JPanel 3 to JPanel 1 which means JPanel 3 is inside JPanel 1

    	subPanel1.add(subPanel3);

    	//Adding JPanel 4 to JPanel 2 which means JPanel 4 is inside JPanel 2

    	subPanel2.add(subPanel4);

    	

    	//Adding JPanel 1 and 2 to main JPanel

    	mainPanel.add(subPanel1);

    	mainPanel.add(subPanel2);



    	//Setting up the container ready for the components to be added.

    	Container pane = getContentPane();

    	setContentPane(pane);

		

		//Adding the main JPanel to the container

    	pane.add(mainPanel);



    	/**Set all the Components Visible.

    	 * If it is set to "false", the components in the container will not be visible.

    	 */

    	setVisible(true);

    }

    

	//Main Method

    public static void main (String[] args) {

    	jpanelInsideJPanel jp = new jpanelInsideJPanel();

	}

}

Important Part of the Program:

//Constructing Main JPanel with GridLayout of 1 row and 2 column

    	mainPanel = new JPanel();

    	mainPanel.setBorder(BorderFactory.createTitledBorder("Main Panel"));

    	mainPanel.setLayout(new GridLayout(1,2));

    	

    	//Constructing JPanel 1 and 2 with GridLayout of 1 row and 1 column

    	subPanel1 = new JPanel();

    	subPanel1.setBorder(BorderFactory.createTitledBorder("Sub Panel 1"));

    	subPanel1.setLayout(new GridLayout(1,1));

    	subPanel2 = new JPanel();

    	subPanel2.setBorder(BorderFactory.createTitledBorder("Sub Panel 2"));

    	subPanel2.setLayout(new GridLayout(1,1));

    	

    	//Constructing JPanel 3 and 4

    	subPanel3 = new JPanel();

    	subPanel3.setBorder(BorderFactory.createTitledBorder("Sub Panel 3"));

    	subPanel4 = new JPanel();

    	subPanel4.setBorder(BorderFactory.createTitledBorder("Sub Panel 4"));

    	

    	//Adding JPanel 3 to JPanel 1 which means JPanel 3 is inside JPanel 1

    	subPanel1.add(subPanel3);

    	//Adding JPanel 4 to JPanel 2 which means JPanel 4 is inside JPanel 2

    	subPanel2.add(subPanel4);

    	

    	//Adding JPanel 1 and 2 to main JPanel

    	mainPanel.add(subPanel1);

    	mainPanel.add(subPanel2);