JPanel – Java Swing – Example

In this tutorial, we are going to see an example of JPanel in Java Swing. JPanel is part of the Java Swing package, is a container that can store a group of components. The main task of JPanel is to organize the components, various layouts can be defined in JPanel that offer better organization of components, but it does not have a title bar like JFrame.

 
 

JPanel Constructors:

JPanel Constructors	Description
JPanel()	It is used to create a new JPanel.
JPanel(LayoutManager l)	Create a new JPanel with the specified layoutManager.
JPanel(boolean isDoubleBuffered)	Creates a new JPanel with a specified buffering strategy.
JPanel(LayoutManager l, boolean isDoubleBuffered)	Creates a new JPanel with the specified layoutManager and a specified buffering strategy.

 

Example of JPanel in Java Swing:

import java.awt.*;
import javax.swing.*;

public class JPanelTest 
{
   JPanelTest()
   {
      //Create the Jframe
      JFrame f = new JFrame("Welcome To StackHowTo!");  
      //Create the JPanel
      JPanel panel = new JPanel();
      //Specify the position and size of the JPanel
      panel.setBounds(40,50,150,150);  
      //Specify the background color of the JPanel
      panel.setBackground(Color.lightGray);
      //Create button 1
      JButton btn1 = new JButton("Button 1");  
      //Specify button position and size   
      btn1.setBounds(50,100,80,30);  
      //Specify the background color of the button
      btn1.setBackground(Color.WHITE); 
      //Create button 2
      JButton btn2 = new JButton("Button 2"); 
      btn2.setBounds(100,100,80,30);  
      btn2.setBackground(Color.RED); 
      //Add the two buttons to the JPanel
      panel.add(btn1); 
      panel.add(btn2);
      //Add JPanel to JFrame
      f.add(panel);
      f.setSize(350,350);  
      f.setLayout(null);  
      f.setVisible(true);  
   }
   public static void main(String args[])
   {
      new JPanelTest();
   }
}

Output:

MCQPractice competitive and technical Multiple Choice Questions and Answers (MCQs) with simple and logical explanations to prepare for tests and interviews.Read More