import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Caculate1 {
 static String s1="";
 static String s2="";
 static int f=9;
 static int num1=0,num2=0;
 public static void main(String[] args) {
 int x=0,y=0,z=0;
 JFrame jf=new JFrame( "我的計(jì)算器");
 jf.setBounds(0,0,300,400);
// jf.setBackground(bgColor);
 jf.setVisible(true);
 jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 
 JTextField show=new JTextField("0");
 //此處為布局：也就是定義五個(gè)容器，（也可以理解為將定義的JFrame空間分為5個(gè)容器）
 JPanel jp1=new JPanel(new GridLayout(1,3));//存儲：
 JPanel jp2=new JPanel(new GridLayout(1,3));
 JPanel jp3=new JPanel(new GridLayout(1,3));
 JPanel jp4=new JPanel(new GridLayout(1,3));
 JPanel jp5=new JPanel(new GridLayout(1,3));
 
 JButton bt_add=new JButton("+");
 JButton bt_sub=new JButton("-");
 JButton bt_mul=new JButton("*");
 JButton bt_div=new JButton("/");
 JButton bt_7=new JButton("7");
 JButton bt_8=new JButton("8");
 JButton bt_9=new JButton("9");
 JButton bt_4=new JButton("4");
 JButton bt_5=new JButton("5");
 JButton bt_6=new JButton("6");
 JButton bt_1=new JButton("1");
 JButton bt_2=new JButton("2");
 JButton bt_3=new JButton("3");
 JButton bt_0=new JButton("0");
 JButton bt_c=new JButton("C");
 JButton bt_equal=new JButton("=");
 
 jf.setLayout(new GridLayout(6,1));
 //容器1 ：添加 '+','-','*','/'按鈕
 jp1.add(bt_add);
 jp1.add(bt_sub);
 jp1.add(bt_mul);
 jp1.add(bt_div);
 //容器2：添加'7','8','9'按鈕
 jp2.add(bt_7);
 jp2.add(bt_8);
 jp2.add(bt_9);
 //容器3：添加'4','5','6'按鈕
 jp3.add(bt_4);
 jp3.add(bt_5);
 jp3.add(bt_6);
 //容器4：添加'1','2','3'按鈕
 jp4.add(bt_1);
 jp4.add(bt_2);
 jp4.add(bt_3);
 //容器5：添加'0','C','='
 jp5.add(bt_0);
 jp5.add(bt_c);
 jp5.add(bt_equal);
 
 jf.add(show);
 jf.add(jp1);
 jf.add(jp2);
 jf.add(jp3);
 jf.add(jp4);
 jf.add(jp5);
//元素已經(jīng)定義好了，思路也很簡單：(1)JFrame定義一個(gè)大容器jf,jf= 1個(gè)顯示框(show)+5個(gè)容器，分別定義顯示框和容器，
 //(2)類似樹形添加元素的數(shù)據(jù)結(jié)構(gòu)，為jf添加元素
 
 //下面便是時(shí)間監(jiān)聽了(又稱加載驅(qū)動)
 bt_9.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  
  s1=s1+9;
  show.setText(s1);
  }
  
 });
 
 bt_8.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  
  s1=s1+8;
  show.setText(s1);
  }
  
 });
 
 bt_7.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  
  s1=s1+7;
  show.setText(s1);
  }
  
 });
 
 bt_6.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  
  s1=s1+6;
  show.setText(s1);
  }
  
 });
 
 bt_5.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  
  s1=s1+5;
  show.setText(s1);
  }
  
 });
 
 bt_4.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  
  s1=s1+4;
  show.setText(s1);
  }
  
 });
 
 bt_3.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  
  s1=s1+3;
  show.setText(s1);
  }
  
 });
 
 bt_0.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  
  s1=s1+0;
  show.setText(s1);
  }
  
 });
 
 bt_2.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  
  s1=s1+2;
  show.setText(s1);
  }
  
 });
 
 bt_1.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  
  s1=s1+1;
  show.setText(s1);
  }
  
 });
 
 bt_0.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  
  s1=s1+0;
  show.setText(s1);
  }
  
 });
 
 
 bt_equal.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  num1=Integer.valueOf(s2);
  num2=Integer.valueOf(s1);
  int z=0;
  char fg=' ';
  
  switch(f){
  case 0:
   z=num1+num2;
   fg='+';
   break;
  case 1:
   z=num1-num2;
   fg='-';
   break;
  case 2:
   z=num1*num2;
   fg='*';
   break;
  case 3:
   fg='/';
   if(num2==0)
   num2=num2+1;
   z=num1/num2;
   break;
  default:
   break;
  }
  show.setText(s2+" "+fg+" "+s1+" = "+z);
  }
  
 });
 bt_add.addActionListener(new ActionListener(){

  @Override
  public void actionPerformed(ActionEvent e) {
  s2=s1;
  s1="";
  f=0;
  show.setText(s2+"+");
  }
  
 });
 bt_sub.addActionListener(new ActionListener() {

  @Override
  public void actionPerformed(ActionEvent e) {
  // TODO Auto-generated method stub
  s2 = s1;
  s1 = "";
  f = 1;
  show.setText(s2 + " - ");
  }
 });
 bt_mul.addActionListener(new ActionListener() {

  @Override
  public void actionPerformed(ActionEvent e) {
  // TODO Auto-generated method stub
  s2 = s1;
  s1 = "";
  f = 2;
  show.setText(s2 + " * ");
  }
 });
 bt_div.addActionListener(new ActionListener() {

  @Override
  public void actionPerformed(ActionEvent e) {
  // TODO Auto-generated method stub
  s2 = s1;
  s1 = "";
  f = 3;
  show.setText(s2 + " / ");
  }
 });
 bt_c.addActionListener(new ActionListener() {

  @Override
  public void actionPerformed(ActionEvent e) {
  // TODO Auto-generated method stub
  s2 = "";
  s1 = "";
  num1 = 0;
  num2 = 0;
  f = 9;
  show.setText("0");
  }
 });
 }

}