Java基本语法实验报告 - 墨钺 - 博客园
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题目       Java基本语法                     

课程名称:  JAVA语言程序设计   

   级:    1705-1                    

   名:   刘雨馨     学号:   20173445      

指导教师:    王建民                     

 

 

正文部分格式要求:

1、 正文汉子部分要求宋体小四,行间距固定值20磅;首行缩进两个字符。

2、 程序英文部分要求采用Times New Roman字体,行间距固定值20磅,程序缩进采用四个字符,程序部分要求采用必要的注释。

3、 实验报告要求完成以下三项内容:

1) 按照题目内容要求编写程序实现功能。

2) 实验报告中要求包括程序设计思想、程序流程图、源程序、实现结果截图、实验总结(包括调试过程中出现的错误等)。

一、

源程序:

Calculation.java

 

public class Calculation {
    
    private int operator;            //操作数
    private int operand1;            //操作数前面的数
    private int operand2;            //操作数后面的书
    private int result;                //运算结果,除法结果取整数部分
    private int statistics;            //统计正误
    
    public int getResult(){
        return result;
    }
    
    public int getStatistics(){        
        return statistics;
    }
    
    public Calculation( int operand1 , int operator , int operand2 ){
        this.operand1 = operand1;
        this.operator = operator;
        this.operand2 = operand2;
    }
    
    public void manager(){
        switch(operator){
            case 1:
                System.out.println( operand1 +" + " + operand2 +" = " );
                result = operand1 + operand2;
                break;
            case 2:
                System.out.println( operand1 +" - " + operand2 +" = "  );
                result = operand1 - operand2;
                break;
            case 3:
                System.out.println( operand1 +" * " + operand2 +" = "  );
                result = operand1 * operand2;
                break;
            case 4:
                System.out.println( operand1 +" / " + operand2 +" = "  );
                result = operand1 / operand2;
                break;
        }
    }
    
    public void judge( int result ){        //判断正误
        if( this.result == result){
            statistics = 1;                    //正确为1
        }
        else
            statistics = 0;                    //错误为0
    }

}

 

 

Arithmetic.java

 

import java.util.Random;
import java.util.Scanner;

public class Arithmetic {
    @SuppressWarnings("resource")
    public static void main( String[] args ){
        
        Random rand = new Random();
        Scanner in = new Scanner( System.in );
        
        int operand1 = 0 ;
        int operand2 = 0;
        int operator;
        int result;
        int count=0;                                //统计正确的题目数量
        int i;
        Calculation[] cal = new Calculation[30];    //30道题目
        
        //随机题目并显示序号与题目
        for( i=0; i<30; i++ ){
            operator = rand.nextInt(4)+1;
            
            switch( operator ){
                case 1:
                    operand1 = rand.nextInt(100);
                    operand2 = rand.nextInt(100);
                    break;
                case 2:                                //减法不出现负数
                    operand1 = rand.nextInt(100);
                    operand2 = rand.nextInt( operand1 );
                    break;
                case 3:                                //乘除范围更小
                    operand1 = rand.nextInt(10);
                    operand2 = rand.nextInt(10);
                    break;
                case 4:
                    operand1 = rand.nextInt(20);
                    operand2 = rand.nextInt(9)+1;
                    break;
            }
            
            System.out.print( (i+1) +"  ");
            cal[i] = new Calculation( operand1, operator, operand2);
            cal[i].manager();
            result = in.nextInt();                    //输入答案并判断正误
            cal[i].judge( result);
        }
        
        
        //结算
        System.out.println("错误的题目及正确答案:");
        for( i=0; i<30; i++){
            if( cal[i].getStatistics() == 0 ){
                System.out.println( i+1 +"  "+ cal[i].getResult() );
            }
            else
                count++;
        }
        
        System.out.println();
        System.out.println("题目总数30道,正确"+count+"道,错误"+(30-count)+"道");        
    }
}

 

 

实验结果截图

 

 

 

 

实验总结:
题目不难但是做的过程中小错误频发,不够细心也缺少练习,思路不确定,经常修改

调试错误:

 

原因是没有实例化对象,这个错误出现很多次了,需要注意记住

 

二、

源代码:

Random.java

public class Random {
    private String rand;
    
    Random(){                                                //生成验证码
    rand = "";
    for( int i=0; i<6; i++ ){
        int intVal = (int)(Math.random() * 26 + 97);
        rand = rand + (char)intVal;                    //此处+用作连接符
}
    
    public void judge( String rand ){
        if( this.rand.equals(rand) )
            System.out.println("验证码正确");
        else
            System.out.println("验证码错误");
    }
    
    public String getRand(){
        return rand;
    }

}

 

Validate.java

import java.util.Scanner;

public class Validate {
    public static void main( String [] args ){
        String rand = new String();
        @SuppressWarnings("resource")
        Scanner in = new Scanner( System.in );
        Random ran = new Random();
        System.out.println(ran.getRand());
        System.out.println("请输入验证码");
        rand = in.next();
        ran.judge(rand);
    }
}

 

 

 

运行结果:

 

 

 

总结:

总的还算顺利,第一次输出的时候在验证码前面带了一个null,需要让rand为空

posted on 2018-10-08 02:33  墨钺  阅读(859)  评论(0编辑  收藏