Java by API/java.awt/GridLayout

new GridLayout(int rows, int cols)

 
/*
 * Output:
 *  
 */

import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public MainClass(){
    super(new GridLayout(2,2));
    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.jexp.ru" ));
    add(new JButton("www.j ava 2 s . c o m" ));
  }
  
  
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200,200);
    frame.setVisible(true);
  }
}

new GridLayout(int rows, int cols, int hgap, int vgap)

 
import java.awt.Container;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Main {
  public static void main(String[] args) {
    JFrame aWindow = new JFrame("This is a Grid Layout");
    aWindow.setBounds(30, 30, 300, 300);
    aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    GridLayout grid = new GridLayout(3, 4, 30, 20);
    Container content = aWindow.getContentPane();
    content.setLayout(grid);
    JButton button = null;
    for (int i = 1; i <= 10; i++) {
      content.add(button = new JButton(" Press " + i));
    }
    aWindow.pack();
    aWindow.setVisible(true);
  }
}