Java tutorial
import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class GridBagLayoutColumnSpanHORIZONTAL { public static void main(String[] args) { JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container pane = f.getContentPane(); pane.setLayout(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); gbc.gridx = 1; gbc.gridy = GridBagConstraints.RELATIVE; pane.add(new JButton("First row, first column"), gbc); pane.add(new JButton("Second row"), gbc); gbc.gridwidth = 2; gbc.fill = GridBagConstraints.HORIZONTAL; pane.add(new JButton("Third row, spans two columns"), gbc); gbc.gridwidth = 1; gbc.fill = GridBagConstraints.NONE; gbc.gridx = GridBagConstraints.RELATIVE; pane.add(new JButton("First row, second column"), gbc); f.setSize(400, 300); f.setVisible(true); } }