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-program-sample.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);

Posted in: JPanel