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

public class GridLayoutTest1 extends JFrame{

  public static void main(String[] args){
    GridLayoutTest1 frame = new GridLayoutTest1();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 300, 200);
    frame.setTitle("ƒ^ƒCƒgƒ‹");
    frame.setVisible(true);
  }

  GridLayoutTest1(){
    JButton button1 = new JButton("Button1");
    JButton button2 = new JButton("Button2");
    JButton button3 = new JButton("Button3");

    JPanel p = new JPanel();
    p.setLayout(new GridLayout());

    p.add(button1);
    p.add(button2);
    p.add(button3);

    getContentPane().add(p, BorderLayout.CENTER);
  }