关于文件储存-四则运算

使用BufferedWrite、File建立文件的输入输出流
编写生成随机数的函数
编写生成加减乘除符号的函数
先将生成的一百道题写入文件中，同时将这一百道题的结果存入数组中，再将文件中的运算题一道一道读入到控制台中， 用户输入答案，与标准答案比较，
若正确，分数计数器加一，若错误，错误计数器加一，将其输入答案的语句和判断语句放入try-catch语句中，若检测到输入异常，跳出出题循环，输出分数及错题数

package suiji_fouroperation_100;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class Fourqperaction {    
    
    public static int produceNum() {
        int temp;
        temp = (int)(Math.random()*100);
        return temp;
    }
    
    public static String produceChar() {
        String[] zf = new String[]{"+", "-", "*", "/"};
        String temp1;
        int temp2;
        temp2 = (int)(Math.random()*3);
        temp1 = zf[temp2];
        return temp1;        
    }
    
    @SuppressWarnings("resource")
    public static void main(String[] args) throws IOException {
        int i;
        int k1;
        int k2;
        int[] an = new int[100];//存答案
        String s;
        Scanner in = new Scanner(System.in);
        int uan;
        int score = 0;
        int fals = 0;
        
        
        File file = new File("Text.txt");
        if (!file.exists()) {// 如果文件不存在则创建  
            file.createNewFile();  
        }
        // 获取该文件的缓冲输出流  
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file));          
        
        
        for(i = 0; i < 100; i++) {
            k1 = produceNum();
            k2 = produceNum();
            s = produceChar();
            if(s.compareTo("-") == 0) {
                if(k1 < k2) {
                    int temp;
                    temp = k1;
                    k1 = k2;
                    k2 = temp;
                }
                an[i] = k1 - k2;
            }
            else if(s.compareTo("+") == 0) {
                an[i] = k1 + k2;
            }
            else if(s.compareTo("*") == 0) {
                an[i] = k1 * k2;
            }
            else if(s.compareTo("/") == 0) {
                int temp = k1;
                k1 = temp * k2;
                if(k2 == 0) {
                    k2++;
                    k1 = temp * k2;
                }
                an[i] = temp;
            }
            String k11, k22;
            k11 = k1+"";
            k22 = k2+"";
            bufferedWriter.write(k11+s+k22+"=");
            bufferedWriter.newLine();// 表示换行            
            bufferedWriter.write("***********************");
            bufferedWriter.newLine();// 表示换行
            bufferedWriter.flush();// 清空缓冲区
            //bufferedWriter.close();// 关闭输出流
        }        
        
        
        BufferedReader bufferedReader = new BufferedReader(new FileReader(file));  
        String line = "";// 用来保存每次读取一行的内容
        String stop = "0";
        
        i = 0;
        while (((line = bufferedReader.readLine()) != null)||(stop.compareTo("*") == 0)||(i <= 99)) {  
            System.out.println(line);
            line = bufferedReader.readLine();
            System.out.println(line);
            
            try {
                uan = in.nextInt();
                if(uan == an[i]) {
                    System.out.println("正确");
                    System.out.print("\n");
                    score++;
                }
                else {
                    System.out.println("错误，正确结果为"+an[i]);
                    System.out.print("\n");
                    fals++;
                }
            }
            catch(Exception e) {
                break;
            }
            i++;
        }  
        System.out.println("得分为"+score+"分"+"，做错题数为"+fals+"道");
        bufferedReader.close();// 关闭输入流
        
        
    }    
    
    
}