JPanel

package cn.rushangw.lesson05;

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

public class JPanelDemo extends JFrame {
    public JPanelDemo() {

        Container container = getContentPane();

        container.setLayout(new GridLayout(2,1,10,10));

        JPanel panel1 = new JPanel(new GridLayout(1,3));
        JPanel panel2 = new JPanel(new GridLayout(1,2));
        JPanel panel3 = new JPanel(new GridLayout(2,1));
        JPanel panel4 = new JPanel(new GridLayout(3,2));

        panel1.add(new Button("1"));
        panel1.add(new Button("1"));
        panel1.add(new Button("1"));
        panel2.add(new Button("1"));
        panel2.add(new Button("1"));
        panel3.add(new Button("1"));
        panel3.add(new Button("1"));
        panel4.add(new Button("1"));
        panel4.add(new Button("1"));
        panel4.add(new Button("1"));
        panel4.add(new Button("1"));
        panel4.add(new Button("1"));
        panel4.add(new Button("1"));


        setVisible(true);
        setSize(500,500);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        container.add(panel1);
        container.add(panel2);
        container.add(panel3);
        container.add(panel4);

    }

    public static void main(String[] args) {
        new JPanelDemo();
    }
}