setBounds绝对布局

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

class Demo03 extends Frame
{
   Button button1 = new Button("aaa");
   Button button2 = new Button("bbb");
   Button button3 = new Button("ccc");
   
   Demo03()
   {
       setSize(500,500);
       setLayout(null);
       button1.setBounds(40,40,100,100);
       button2.setBounds(100,100,120,320);
       button3.setBounds(400,100,500,120);
       add(button1);
       add(button2);
       add(button3);       
       setVisible(true);
   }
   
   public static void main(String s[])
   {
       new Demo03();
   }
}