DemoGridLayout.java

import java.awt.*;
import javax.swing.*;

public class DemoGridLayout {

  public static void main(String args[]) {
    JFrame frame = new JFrame("Grid Layout");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(300, 200);
    JPanel panel = new JPanel(new GridLayout(2, 3));
    JButton button1 = new JButton("Button1");
    JButton button2 = new JButton("Button2");
    JButton button3 = new JButton("Button3");
    JButton button4 = new JButton("Button4");
    JButton button5 = new JButton("Button5");
    JButton button6 = new JButton("Button6");
    panel.add(button1);
    panel.add(button2);
    panel.add(button3);
    panel.add(button4);
    panel.add(button5);
    panel.add(button6);
    frame.add(panel);
    frame.setVisible(true);
  }
}