GridBagLayoutEx.java

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import javax.swing.*;  
import java.awt.*;
    
public class GridBagLayoutEx {
    public static void main(String[] args) {  
        GridBagLayoutEx gui = new GridBagLayoutEx();  
        gui.go();
    }
 
    public void go() {
        JFrame frame = new JFrame();  
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel();  
        panel.setLayout(new GridBagLayout()); 
        GridBagConstraints c = new GridBagConstraints();  
        c.gridx = 0;
        c.gridy = 0;
        c.gridwidth = 1; // default value  
        c.gridheight = 1; // default value  
        c.weightx = 0.0; // default value  
        c.weighty = 0.0; // default value
        c.anchor = GridBagConstraints.CENTER; // default value
        c.fill = GridBagConstraints.HORIZONTAL;
        c.insets = new Insets(0, 0, 0, 0); // default value  
        c.ipadx = 0; // default value
        c.ipady =  0; // default value
        JButton button = new JButton("Button 1");  
        c.weightx = 0.5;
        panel.add(button, c);
        button = new JButton("Button 2");  
        c.gridx = 1; // 2nd column  
        panel.add(button, c);
        button = new JButton("Button 3");  
        c.gridx = 2; // 3rd column  
        panel.add(button, c);
        button = new JButton("Button 4");  
        c.gridx = 0; // 1st column
        c.gridy = 1; // 2nd row
        c.gridwidth = 3; // spans 3 columns  
        c.weightx = 0.0;
        c.ipady = 40; // makes the button tall  
        panel.add(button, c);
        button = new JButton("Button 5");  
        c.gridx = 1; // 2nd column
        c.gridy = 2; // 3rd row
        c.gridwidth = 2; // spans 2 columns
        c.weighty = 1.0; // takes up extra vertical space  
        c.anchor = GridBagConstraints.SOUTH;
        c.insets = new Insets(10, 0, 0, 0); // top padding
        c.ipady = 0;
        panel.add(button, c);
        frame.add(panel);  
        frame.pack();  
        frame.setVisible(true);
    }
}