java之重构四则运算

今天又来一次课堂测试，这次测试让我对文件流的了解又加深了好多好多，这次就像升华一般，虽然和其他人比还有区别，但与以前的我大不一样了。

import java.io.*;
import java.util.*;

import org.omg.Messaging.SyncScopeHelper;
public class Creat {
    int wrongNum=0;
    static File file=new File("answ.txt");
    static FileWriter fw=null;
    static FileReader fr = null;
    int[] answ = new int[31];
    String[] timu = new String[31];
//题目创建并存储
    public void creat() throws IOException {

        for (int i = 0; i < 3; i++) {

            int choice = (int) (Math.random() * 5);
            switch (choice) {
            // +
            case 0:
                doAdd(i + 1);
                break;
            // -
            case 1:
                doReduce(i + 1);
                break;
            // *
            case 2:
                doMul(i + 1);
                break;
            // /
            case 3:
                doDivide(i + 1);
                break;
            }
        }
    }
//    /
    private void doDivide(int i) throws IOException {
        // TODO Auto-generated method stub
        System.out.print("第" + i + "次为：");

        int one = (int) (Math.random() * 10);
        int two = (int) (Math.random() * 10);
        while (two == 0) {
            two = (int) (Math.random() * 10);
        }
        answ[i] = one / two;
        write(one,two,"/");
        System.out.println("答案为" + answ[i]);
        System.out.println(one + "/" + two + "=" + "

");
    }

//    *
    private void doMul(int i) throws IOException {
        // TODO Auto-generated method stub
        System.out.print("第" + i + "次为：");
        int one = (int) (Math.random() * 10);
        int two = (int) (Math.random() * 10);
        answ[i] = one * two;
        String numOne = String.valueOf(one);
        String numTwo = String.valueOf(two);
        timu[i] = numOne + numTwo;
        write(one,two,"*");
        System.out.println("答案为" + answ[i]);
        System.out.println(one + "*" + two + "=" + "

");
    }
//    -
    private void doReduce(int i) throws IOException {
        // TODO Auto-generated method stub
        System.out.print("第" + i + "次为：");
        int one = (int) (Math.random() * 10);
        int two = (int) (Math.random() * 10);
        answ[i] = one - two;
        String numOne = String.valueOf(one);
        String numTwo = String.valueOf(two);
        timu[i] = numOne + numTwo;
        write(one,two,"-");
        System.out.println("答案为" + answ[i]);
        System.out.println(one + "-" + two + "=" + "

");
    }
//    +
    private void doAdd(int i) throws IOException {
        // TODO Auto-generated method stub
        System.out.print("第" + i + "次为：");
        int one = (int) (Math.random() * 10);
        int two = (int) (Math.random() * 10);
        answ[i] = one + two;
        String numOne = String.valueOf(one);
        String numTwo = String.valueOf(two);
        timu[i] = numOne + numTwo;
        write(one,two,"+");
        System.out.println("答案为" + answ[i]);
        System.out.println(one + "+" + two + "=" + "

");
    }
//存储写入
    private void write(int one,int two,String f ) throws IOException {
        // TODO Auto-generated method stub
        fw=new FileWriter(file,true);
        BufferedWriter bw=new BufferedWriter(fw);
        bw.write(one+f+two+"=");
        bw.newLine();// 表示换行
        bw.write("*");
        bw.newLine();// 表示换行
        bw.flush();// 清空缓冲区
        bw.close();// 关闭输出流
    }
//测试判断区
    public void judge() throws IOException {
        //首先，读文件
        Scanner sc=new Scanner(System.in);
        BufferedReader br = null;
        fr = new FileReader(file);
        br = new BufferedReader(fr);
        String s = null;
        int i=0;
        while ((s = br.readLine())!=null) {
            
            if (s.equals("*")) {
                System.out.println("请输入答案：");
                @SuppressWarnings("unused")
                int a = sc.nextInt();
                if(a==answ[i]) {
                    
                }
                else
                    wrongNum++;
            } else {
                System.out.println(s);
            }

        }
        fr.close();
        System.out.println("一共错了"+wrongNum+"个！");
    }
}

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();
    }
    

}