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Java Swing – JPanel With Examples

  • Difficulty Level : Easy
  • Last Updated : 10 Nov, 2021

JPanel, a part of the Java Swing package, is a container that can store a group of components. The main task of JPanel is to organize components, various layouts can be set in JPanel which provide better organization of components, however, it does not have a title bar.

Constructors of JPanel 

  1. JPanel(): creates a new panel with a flow layout
  2. JPanel(LayoutManager l): creates a new JPanel with specified layoutManager
  3. JPanel(boolean isDoubleBuffered): creates a new JPanel with a specified buffering strategy
  4. JPanel(LayoutManager l, boolean isDoubleBuffered): creates a new JPanel with specified layoutManager and a specified buffering strategy

Commonly used Functions of JPanel 

  1. add(Component c): Adds a component to a specified container
  2. setLayout(LayoutManager l): sets the layout of the container to the specified layout manager
  3. updateUI(): resets the UI property with a value from the current look and feel.
  4. setUI(PanelUI ui): sets the look and feel of an object that renders this component.
  5. getUI(): returns the look and feel object that renders this component.
  6. paramString(): returns a string representation of this JPanel.
  7. getUIClassID(): returns the name of the Look and feel class that renders this component.
  8. getAccessibleContext(): gets the AccessibleContext associated with this JPanel.

Let us take a sample program in order to illustrate the use of JPanel class by appending sequential execution snapshots of outputs justifying the below program sets as follows:

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Example:

Java






// Java Program to Create a Simple JPanel
// and Adding Components to it
  
// Importing required classes
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
  
// Class 1
// Helper class extending JFrame class
class solution extends JFrame {
  
    // JFrame
    static JFrame f;
  
    // JButton
    static JButton b, b1, b2;
  
    // Label to display text
    static JLabel l;
  
    // Main class
    public static void main(String[] args)
    {
        // Creating a new frame to store text field and
        // button
        f = new JFrame("panel");
  
        // Creating a label to display text
        l = new JLabel("panel label");
  
        // Creating a new buttons
        b = new JButton("button1");
        b1 = new JButton("button2");
        b2 = new JButton("button3");
  
        // Creating a panel to add buttons
        JPanel p = new JPanel();
  
        // Adding buttons and textfield to panel
        // using add() method
        p.add(b);
        p.add(b1);
        p.add(b2);
        p.add(l);
  
        // setbackground of panel
        p.setBackground(Color.red);
  
        // Adding panel to frame
        f.add(p);
  
        // Setting the size of frame
        f.setSize(300, 300);
  
        f.show();
    }
}

Output: 

Example 2:

Java




// Java Program to Create a JPanel with a Border Layout
// and Adding Components to It
  
// Importing required classes
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
  
// Main class
// Extending JFrame class
class solution extends JFrame {
  
    // JFrame
    static JFrame f;
  
    // JButton
    static JButton b, b1, b2, b3;
  
    // Label to display text
    static JLabel l;
  
    // Main driver method
    public static void main(String[] args)
    {
        // Creating a new frame to store text field and
        // button
        f = new JFrame("panel");
  
        // Creating a label to display text
        l = new JLabel("panel label");
  
        // Creating a new buttons
        b = new JButton("button1");
        b1 = new JButton("button2");
        b2 = new JButton("button3");
        b3 = new JButton("button4");
  
        // Creating a panel to add buttons
        // and a specific layout
        JPanel p = new JPanel(new BorderLayout());
  
        // Adding buttons and textfield to panel
        // using add() method
        p.add(b, BorderLayout.NORTH);
        p.add(b1, BorderLayout.SOUTH);
        p.add(b2, BorderLayout.EAST);
        p.add(b3, BorderLayout.WEST);
        p.add(l, BorderLayout.CENTER);
  
        // setbackground of panel
        p.setBackground(Color.red);
  
        // Adding panel to frame
        f.add(p);
  
        // Setting the size of frame
        f.setSize(300, 300);
  
        f.show();
    }
}

Output:

 Example 3:

Java




// Java Program to Create a JPanel with a Box layout
// and Adding components to it
  
// Importing required classes
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
  
// Main class
// Extending JFrame class
class solution extends JFrame {
  
    // JFrame
    static JFrame f;
  
    // JButton
    static JButton b, b1, b2, b3;
  
    // Label to display text
    static JLabel l;
  
    // Main drive method
    public static void main(String[] args)
    {
        // Creating a new frame to store text field and
        // button
        f = new JFrame("panel");
  
        // Creating a label to display text
        l = new JLabel("panel label");
  
        // Creating a new buttons
        b = new JButton("button1");
        b1 = new JButton("button2");
        b2 = new JButton("button3");
        b3 = new JButton("button4");
  
        // Creating a panel to add buttons and
        // textfield and a layout
        JPanel p = new JPanel();
  
        // Setting box layout
        p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));
  
        // Adding buttons and textfield to panel
        p.add(b);
        p.add(b1);
        p.add(b2);
        p.add(b3);
        p.add(l);
  
        // Setting background of panel
        p.setBackground(Color.red);
  
        // Adding panel to frame
        f.add(p);
  
        // Setting the size of frame
        f.setSize(300, 300);
  
        f.show();
    }
}

Output:

Henceforth, we are successfully able to generate buttons in our panel. 

Note: In the previous Program, border layout and Box Layout are used. Different other layouts can be used to organize the components in a definite pattern, such as card layout, grid layout, etc. 




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