Java tutorial
import java.awt.Container; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main { public static void main(String[] args) { String title = "GridBagLayout"; JFrame frame = new JFrame(title); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container contentPane = frame.getContentPane(); contentPane.setLayout(new GridBagLayout()); for (int i = 1; i <= 9; i++) { contentPane.add(new JButton("Button " + i)); } frame.pack(); frame.setVisible(true); } }