程式碼

package sizeyunsuan;
import java.io.FileNotFoundException;
import java.io.PrintStream;
import java.util.Random;
import java.util.Scanner;
public class SiZe {
    @SuppressWarnings("unused")
      public static void main(String[] args) throws FileNotFoundException {
          String[] operate 
 
= new String[] { "+", "-", "*", "/" };//定義運算子陣列
          int[] numbers = new int[100];//定義數字部分陣列
          for (int i = 1; i <= 100; i++) {
             numbers[i - 1] = i;
          }
         Random rand = new Random();//定義隨機數
         @SuppressWarnings("resource")
         Scanner in = new Scanner( System.in );
         String fiilename 
 
="d:/shuchu.txt";
         int operand1 = 0 ;
         int operand2 = 0;
         int operator;
         int result;
         int count=0;                                //統計正確的題目數量
         int i;
         duqu[] cal = new duqu[100];    //30道題目
         
         //隨機題目並顯示序號與題目
         for( i=0; i<100; i++ ){
             operator 
 
= rand.nextInt(4)+1;
             
             switch( operator ){
                 case 1:
                     operand1 = rand.nextInt(100);
                     operand2 = rand.nextInt(100);
                     break;
                 case 2:                                //減法不出現負數
                     operand1 = rand.nextInt(100);
                     operand2 = rand.nextInt( operand1 );
                     break;
                 case 3:                                //乘除範圍更小
                     operand1 = rand.nextInt(10);
                     operand2 = rand.nextInt(10);
                     break;
                 case 4:
                     operand2 = rand.nextInt(9)+1;
                     operand1 = rand.nextInt(81-operand2)+operand2;
                     break;
             }
             
             System.out.print( (i+1) +"  ");
             cal[i] = new duqu( operand1, operator, operand2);
             cal[i].manager();
             if(i==0)
                 duqu.flushFile(fiilename);
             duqu.OutputFile(fiilename,cal[i]);
             PrintStream out=System.out;
         
             
            
     }
    }
}

package sizeyunsuan;

import java.io.*;
public class duqu {
    
    private int operator;            //運算元
    private int operand1;            //運算元前面的數
    private int operand2;            //運算元後面的書
    private int result;                //運算結果,除法結果取整數部分
    private int statistics;            //統計正誤
    private String str;                //記錄題目
    
    public int getResult(){
        return result;
    }
    
    public int getStatistics(){        
        return statistics;
    }
    
    public duqu( int operand1 , int operator , int operand2 ){
        this.operand1 = operand1;
        this.operator = operator;
        this.operand2 = operand2;
    }
    
    public void manager(){
        switch(operator){
            case 1:
                str = operand1 +" + " + operand2 +" = ";
                result = operand1 + operand2;
                break;
            case 2:
                str = operand1 +" - " + operand2 +" = ";
                result = operand1 - operand2;
                break;
            case 3:
                str = operand1 +" * " + operand2 +" = ";
                result = operand1 * operand2;
                break;
            case 4:
                str = operand1 +" / " + operand2 +" = ";
                result = operand1 / operand2;
                break;
        }
        System.out.println(str);
    }
    
    public void judge( int result ){        //判斷正誤
        if( this.result == result){
            statistics = 1;                    //正確為1
        }
        else
            statistics = 0;                    //錯誤為0
    }
    
    public static void OutputFile(String filename,duqu cal){
        @SuppressWarnings("unused")
        File file = new File(filename);
        FileWriter fw = null;
        try {
            fw = new FileWriter(filename,true);
        } catch (IOException e) {
            e.printStackTrace();
        }
        PrintWriter p = new PrintWriter(fw);
        p.println(cal.str);
        p.close();
        try {
            fw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public static void flushFile(String filename){
        File file = new File(filename);
        FileWriter fw;
        try {
            fw = new FileWriter(file);
            fw.write("");
            fw.flush();
            fw.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

於下午四點四十完成

總結：主要自己對於緩衝流匯入文字資料夾，輸出文字資料夾，不太理解，一直困於此處，對於四則運算的正誤判斷也有些許的疑問，然後通過百度查閱，以及詢問同學弄懂了自己不是很會的地方，感覺自己在這次課堂測驗上學到了很多