四则运算

 

计应192+4组+郜艳朋

1、eclipse创建Java project，并建立相应的包、类（calculate.java）

2、右击项目，选择Build Path → Add Libraries，打开的对话框选择 JUnit，选择Junit 4 ，点击Finish。

3、在calculate类中编写加减乘除代码

package com.calculate;

public class Calculate {
    public int add(int a,int b)
    {
        return (a+b);
    };
    public int subtract(int a,int b)
    {
        return (a-b);
    };
    public int multiply(int a,int b)
    {
        return (a*b);
    };
    public int divide(int a,int b)
    {
        if(b==0)
        {
            System.out.print("分母不能为0");
            return 0;
        }
        else
        {
            return (a/b);
        }
    };
}

4、编写主函数main

package com.calculate;

public class test {
    public static void main(String[] args)
    {
        Calculate test=new Calculate();
        System.out.println("加法运算："+test.add(12, 13));
        System.out.println("减法运算："+test.subtract(18, 2));
        System.out.println("乘法运算："+test.multiply(2, 6));
        System.out.println("除法运算："+test.divide(4, 4));
    }
}

5、编写测试用例

package com.calculate;

import static org.junit.Assert.*;
import org.junit.*;

public class Calculatetest {
    Calculate mycal=new Calculate();
    @Before
    public void setUp(){
        System.out.println("测试开始");
    }
    @After
    public void down()
    {
        System.out.println("测试结束");
    }
    @Test
    public void testAdd() {
        assertEquals(8,mycal.add(2, 6));
    }
    @Test
    public void testsubtract() {
        assertEquals(2,mycal.subtract(4,2));
        assertEquals(7,mycal.subtract(9, 2));
    }
    @Test
    public void testmultiply() {
        assertEquals(15,mycal.multiply(3, 5));
        assertEquals(12,mycal.multiply(3, 4));
    }
    @Test
    public void testdivide() {
        assertEquals(1,mycal.divide(4, 4));
        assertEquals(0,mycal.divide(4, 0));
        assertEquals(2,mycal.divide(4, 2));
    }
}

标签：--,assertEquals,System,郜艳朋,int,计应,mycal,public,out
来源： https://www.cnblogs.com/hnzj-jy192-JT/p/14645154.html