java之重构四则运算

  1 import java.io.*;
  2 import java.util.*;
  3 
  4 import org.omg.Messaging.SyncScopeHelper;
  5 public class Creat {
  6     int wrongNum=0;
  7     static File file=new File("answ.txt");
  8     static FileWriter fw=null;
  9     static FileReader fr = null;
 10     int[] answ = new int[31];
 11     String[] timu = new String[31];
 12 //题目创建并存储
 13     public void creat() throws IOException {
 14 
 15         for (int i = 0; i < 3; i++) {
 16 
 17             int choice = (int) (Math.random() * 5);
 18             switch (choice) {
 19             // +
 20             case 0:
 21                 doAdd(i + 1);
 22                 break;
 23             // -
 24             case 1:
 25                 doReduce(i + 1);
 26                 break;
 27             // *
 28             case 2:
 29                 doMul(i + 1);
 30                 break;
 31             // /
 32             case 3:
 33                 doDivide(i + 1);
 34                 break;
 35             }
 36         }
 37     }
 38 //    /
 39     private void doDivide(int i) throws IOException {
 40         // TODO Auto-generated method stub
 41         System.out.print("第" + i + "次为：");
 42 
 43         int one = (int) (Math.random() * 10);
 44         int two = (int) (Math.random() * 10);
 45         while (two == 0) {
 46             two = (int) (Math.random() * 10);
 47         }
 48         answ[i] = one / two;
 49         write(one,two,"/");
 50         System.out.println("答案为" + answ[i]);
 51         System.out.println(one + "/" + two + "=" + "\n\n");
 52     }
 53 
 54 //    *
 55     private void doMul(int i) throws IOException {
 56         // TODO Auto-generated method stub
 57         System.out.print("第" + i + "次为：");
 58         int one = (int) (Math.random() * 10);
 59         int two = (int) (Math.random() * 10);
 60         answ[i] = one * two;
 61         String numOne = String.valueOf(one);
 62         String numTwo = String.valueOf(two);
 63         timu[i] = numOne + numTwo;
 64         write(one,two,"*");
 65         System.out.println("答案为" + answ[i]);
 66         System.out.println(one + "*" + two + "=" + "\n\n");
 67     }
 68 //    -
 69     private void doReduce(int i) throws IOException {
 70         // TODO Auto-generated method stub
 71         System.out.print("第" + i + "次为：");
 72         int one = (int) (Math.random() * 10);
 73         int two = (int) (Math.random() * 10);
 74         answ[i] = one - two;
 75         String numOne = String.valueOf(one);
 76         String numTwo = String.valueOf(two);
 77         timu[i] = numOne + numTwo;
 78         write(one,two,"-");
 79         System.out.println("答案为" + answ[i]);
 80         System.out.println(one + "-" + two + "=" + "\n\n");
 81     }
 82 //    +
 83     private void doAdd(int i) throws IOException {
 84         // TODO Auto-generated method stub
 85         System.out.print("第" + i + "次为：");
 86         int one = (int) (Math.random() * 10);
 87         int two = (int) (Math.random() * 10);
 88         answ[i] = one + two;
 89         String numOne = String.valueOf(one);
 90         String numTwo = String.valueOf(two);
 91         timu[i] = numOne + numTwo;
 92         write(one,two,"+");
 93         System.out.println("答案为" + answ[i]);
 94         System.out.println(one + "+" + two + "=" + "\n\n");
 95     }
 96 //存储写入
 97     private void write(int one,int two,String f ) throws IOException {
 98         // TODO Auto-generated method stub
 99         fw=new FileWriter(file,true);
100         BufferedWriter bw=new BufferedWriter(fw);
101         bw.write(one+f+two+"=");
102         bw.newLine();// 表示换行
103         bw.write("*");
104         bw.newLine();// 表示换行
105         bw.flush();// 清空缓冲区
106         bw.close();// 关闭输出流
107     }
108 //测试判断区
109     public void judge() throws IOException {
110         //首先，读文件
111         Scanner sc=new Scanner(System.in);
112         BufferedReader br = null;
113         fr = new FileReader(file);
114         br = new BufferedReader(fr);
115         String s = null;
116         int i=0;
117         while ((s = br.readLine())!=null) {
118             
119             if (s.equals("*")) {
120                 System.out.println("请输入答案：");
121                 @SuppressWarnings("unused")
122                 int a = sc.nextInt();
123                 if(a==answ[i]) {
124                     
125                 }
126                 else
127                     wrongNum++;
128             } else {
129                 System.out.println(s);
130             }
131 
132         }
133         fr.close();
134         System.out.println("一共错了"+wrongNum+"个！");
135     }
136 }

import java.io.IOException;

public class Test {

    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        Test t=new Test();
        t.comeTrue();
        
    }

    private void comeTrue() throws IOException {
        // TODO Auto-generated method stub
        Creat c=new Creat();
        c.creat();
        c.judge();
    }
    

}