面板

package Layout;
import java.awt.*;
import javax.swing.*;
public class MyJPanel extends JFrame {
    private JPanel p1 = new JPanel();//面板默认流式布局
    private JPanel p2 = new JPanel();
    private JButton b1 = new JButton("B1");
    private JButton b2 = new JButton("B2");
    private JButton b3 = new JButton("B3");
    private JButton b4 = new JButton("B4");
    private JButton b5 = new JButton("B5");
    public MyJPanel(){
    this.setTitle("用户界面");
    this.setSize(500, 300);
    this.setLocation(600,400);
       p1.add(b1);
       p1.add(b2);
       p2.add(b4);
       p2.add(b5);
    this.add(p1,BorderLayout.NORTH);
    this.add(b3,BorderLayout.CENTER);
    this.add(p2,BorderLayout.SOUTH);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setVisible(true);
    
    
}
    public static void main(String[] args) {
    MyJPanel l = new MyJPanel();

    }

}