Panel+BorderLayout布局

import java.awt.*;
import java.awt.event.*;

public class Demo04 extends Frame
{
    Button button01 = new Button("aaa");
    Button button02 = new Button("aaa");
    Button button03 = new Button("aaa");
    Button button04 = new Button("aaa");
    Button button05 = new Button("aaa");
    Button button06 = new Button("aaa");
    Button button07 = new Button("aaa");
    Button button08 = new Button("aaa");
    Button button09 = new Button("aaa");
    Button button10 = new Button("aaa");
    Button button11 = new Button("aaa");
    Button button12 = new Button("aaa");
    Button button13 = new Button("aaa");
    Button button14 = new Button("aaa");
    Button button15 = new Button("aaa");
    Button button16 = new Button("aaa");
    Button button17 = new Button("aaa");
    Button button18 = new Button("aaa");
    Button button19 = new Button("aaa");
    Button button20 = new Button("aaa");
    Button button21 = new Button("aaa");
    Button button22 = new Button("aaa");
    Button button23 = new Button("aaa");
    Button button24 = new Button("aaa");
    Button button25 = new Button("aaa");
    
    Panel  p1       = new Panel();
    Panel  p2       = new Panel();
    Panel  p3       = new Panel();
    Panel  p4       = new Panel();
    Panel  p5       = new Panel();
    
    void init()
    {
        p1.setLayout(new BorderLayout());
        p1.add(button01,BorderLayout.NORTH);
        p1.add(button02,BorderLayout.SOUTH);
        p1.add(button03,BorderLayout.WEST);
        p1.add(button04,BorderLayout.EAST);
        p1.add(button05,BorderLayout.CENTER);
        
        p2.add(button06);
        p2.add(button07);
        p2.add(button08);
        p2.add(button09);
        p2.add(button10);
        
        p3.add(button11);
        p3.add(button12);
        p3.add(button13);
        p3.add(button14);
        p3.add(button15);
        
        p4.add(button16);
        p4.add(button17);
        p4.add(button18);
        p4.add(button19);
        p4.add(button20);
        
        p5.add(button21);
        p5.add(button22);
        p5.add(button23);
        p5.add(button24);
        p5.add(button25);
        
        
        p1.setBackground(Color.orange);
        p2.setBackground(Color.cyan);
        p3.setBackground(Color.blue);
        p4.setBackground(Color.green);
        p5.setBackground(Color.PINK);
        
        add(p1,BorderLayout.NORTH);
        add(p2,BorderLayout.SOUTH);
        add(p3,BorderLayout.CENTER);
        add(p4,BorderLayout.WEST);
        add(p5,BorderLayout.EAST);
    }
    
    Demo04()
    {
        setSize(500,500);
        init();
        show();
    }
    
    public static void main(String s[])
    {
        new Demo04();
    }
}