大学生简易Java计算器：代码注释详实

package 大作业计算器;

//JiSuanQi.java
import java.awt.*;
import java.awt.event.*;
public class JiSuanQi
{
   String s="",s1=null,s2=null;
   Frame f=new Frame("计算器");
  TextField tf=new TextField(30);
  Panel p1=new Panel();
  Panel p2=new Panel();
  Panel p3=new Panel();
  Button bt1=new Button("=");
  Button bt2=new Button("删除");
  Button[] bt=new Button[16];
  int id=0;
   public static void main(String[] args)
   {
       new JiSuanQi().init();
   }
    public void init()
    {
       f.setBackground(new Color(85,255,253));
       f.setLayout(new BorderLayout(2,4));
       p2.setLayout(new GridLayout(4,4,4,4));
       p3.setLayout(new BorderLayout(4,4));
       f.setResizable(false);
       f.add(p1,BorderLayout.NORTH);
       f.add(p2);

       p3.add(bt2,BorderLayout.NORTH);
       p3.add(bt1);
       p1.add(tf);
       f.add(p3,BorderLayout.EAST);
       String[] b={"1","2","3","+","4","5","6","-","7","8","9","*","0",".","复位","/"};
       for(int i=0;i<16;i++)
       {
           bt[i]=new Button(b[i]);
           p2.add(bt[i]);
       }
       bt[0].setForeground(Color.blue);
       bt[1].setForeground(Color.blue);
       bt[2].setForeground(Color.blue);
       bt[4].setForeground(Color.blue);
       bt[5].setForeground(Color.blue);
       bt[6].setForeground(Color.blue);
       bt[8].setForeground(Color.blue);
       bt[9].setForeground(Color.blue);
       bt[10].setForeground(Color.blue);
       bt[12].setForeground(Color.blue);
       bt[13].setForeground(Color.blue);
       bt[3].setForeground(Color.red);
       bt[7].setForeground(Color.red);
       bt[11].setForeground(Color.red);
       bt[15].setForeground(Color.red);
       bt[14].setForeground(Color.red);
       bt1.setForeground(Color.red);
       bt2.setForeground(Color.red);
       f.pack();
       f.setVisible(true);