Java tutorial
import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class Main extends JFrame { Main() { setDefaultCloseOperation(EXIT_ON_CLOSE); setSize(500, 500); JPanel panel1 = new JPanel(new GridBagLayout()); JButton b1 = new JButton("button 1"), b2 = new JButton("button 2"); GridBagConstraints gbc = new GridBagConstraints(); gbc.gridx = 1; gbc.gridwidth = 1; panel1.add(b1, gbc); gbc.gridx = 2; gbc.gridwidth = 2; gbc.fill = gbc.HORIZONTAL; // set fill property to HORIZONTAL gbc.weightx = 2.0; panel1.add(b2, gbc); // While adding button also add it with gbc add(panel1); setVisible(true); } public static void main(String[] args) { new Main(); } }