Java tutorial
import java.awt.GridLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class Main extends JPanel { public Main() { add(new JButton("w w w.j a v a 2 s . c o m")); add(new JButton("w w w.j a v a 2 s . com")); add(new JButton("w w w.java2s.com")); add(new JButton("www.j ava 2 s . c o m")); GridLayout gridLayout = new GridLayout(); setLayout(gridLayout); System.out.println(gridLayout.getColumns()); } public static void main(String[] args) { JFrame frame = new JFrame(); frame.getContentPane().add(new Main()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200, 200); frame.setVisible(true); } }