GridBagLayout – Java Swing – Example

In this tutorial, we are going to see an example of GridBagLayout in Java Swing. GridBagLayout is one of the most flexible and complex layout managers provided by the Java platform. GridBagLayout places components in a grid of rows and columns, allowing specified components to span multiple rows or columns. Not all rows are necessarily the same height. Similarly, not all columns are necessarily the same width. Essentially, GridBagLayout places components in rectangles (cells) in a grid, then uses the preferred sizes of the components to determine the size of the cells. The resizing behavior is based on the weights that the program assigns to the components in GridBagLayout.
 

 

Example of GridBagLayout in Java Swing

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
  
public class MyGridbag extends JFrame 
{   
    MyGridbag() 
    { 
        // Set the title of JFrame
        setTitle("GridBagLayout Example"); 
  
        // Creating an object of Jpanel class
        JPanel p = new JPanel(); 
  
        // Set the layout
        p.setLayout(new GridBagLayout()); 
  
        // Create a constraint object
        GridBagConstraints c = new GridBagConstraints(); 
  
        // Specifies the external padding of all components
        c.insets = new Insets(1, 1, 1, 1); 
  
        // column 0
        c.gridx = 0; 
  
        // line 0
        c.gridy = 0; 
  
        // increases the width of the components by 10 pixels
        c.ipadx = 100; 
  
        // increases the height of the components by 50 pixels
        c.ipady = 100; 
  
        // Add constraints
        p.add(new JButton("Button 1"), c); 
  
        // column 1 
        c.gridx = 1; 
  
        // increases the width of the components by 90 pixels
        c.ipadx = 20; 
  
        // increases the height of the components by 40 pixels
        c.ipady = 20; 
  
        // Add constraints
        p.add(new JButton("Button 2"), c); 
  
        // column 0 
        c.gridx = 0; 
  
        // line 2 
        c.gridy = 1; 
  
        // increases the width of the components by 20 pixels
        c.ipadx = 10; 
  
        // increases the height of the components by 20 pixels
        c.ipady = 10; 
  
        // Add constraints
        p.add(new JButton("Button 3"), c); 
  
        // increases the width of the components by 10 pixels
        c.ipadx = 60; 
  
        // column 1 
        c.gridx = 1; 
  
        // Add constraints
        p.add(new JButton("Button 4"), c); 
  
        // Creation of a "WindowAdapter" object  
        WindowListener winAdap = new WindowAdapter() 
    { 
            public void windowClosing(WindowEvent e) 
            { 
                // exit the system
                System.exit(0); 
            } 
        }; 
  
        // add the "windowlistener" listener
        addWindowListener(winAdap); 
  
        // Add constraints
        getContentPane().add(p); 
  
        // Set JFrame size
        setSize(400, 250); 
  
        // Set the visibility of JFrame
        setVisible(true); 
    } 
  
    // Main method
    public static void main(String[] args) 
    { 
        // call the constructor
        new MyGridbag(); 
    } 
}

Output:

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