hw15_21.java

JAVA 2面向对象程序设计(习题参考答案9-17).rar

import java.awt.*;
public class hw15_21
{
   static Frame frm=new Frame("小算盘");
   static Panel pnl=new Panel(new GridLayout(3,3));  
   static Panel pnl1=new Panel(new GridLayout(3,2));
   static Panel pnl2=new Panel(new GridLayout(1,5)); 
   static Panel pnl3=new Panel(new GridLayout(4,1)); 
   static Label lab=new Label("0. ",Label.RIGHT);  
   public static void main(String args[])
   {
      frm.setLayout(null);   
      frm.setSize(300,200); 
      frm.setBackground(Color.blue);
      frm.setResizable(true);  
      lab.setBounds(5,30,240,20);
      lab.setBackground(Color.white);    
      pnl.setBounds(40,60,120,80);
      pnl1.setBounds(165,60,80,80);
      pnl2.setBounds(40,140,205,25);
      pnl3.setBounds(5,60,30,104);
      for(int i=1;i<=9;i++)
         pnl.add(new Button(Integer.toString(i))); 
      pnl1.add(new Button("/")); 
      pnl1.add(new Button("sqrt")); 
      pnl1.add(new Button("*")); 
      pnl1.add(new Button("%")); 
      pnl1.add(new Button("-")); 
      pnl1.add(new Button("1/x"));    
      pnl2.add(new Button("0")); 
      pnl2.add(new Button("+/-")); 
      pnl2.add(new Button(".")); 
      pnl2.add(new Button("+")); 
      pnl2.add(new Button("="));  
      pnl3.add(new Button("MC"));  
      pnl3.add(new Button("MR"));
      pnl3.add(new Button("MS"));
      pnl3.add(new Button("M+"));
      frm.add(lab); 
      frm.add(pnl);
      frm.add(pnl1);
      frm.add(pnl2); 
      frm.add(pnl3);      
      frm.setVisible(true); 
   }
}