作业5（加强版）

package com.szys.junit;
 
 
public class Packaging {
    int m;
    int n;
    public T(int m,int n)
    {
    	try{
        this.m=m;
        this.n=n;
    	}catch(Exception e)
    	{
    		if(a<0||a>100||b<0||b>100)
    		{
    			System.out.ptintln("你输入的数不在范围内！");
    		}
                
    	}
    }
    public int add()
    {
        return m + n;
    }
    public int minus()
    {
        return m - n;
    }
    public int mul()
    {
        return m * n;
    }
    public int div()throws Exception
    {
        if(0 == n)
        {
            throw new Exception("除数不能为0");           
        }
        return m / n;
 
    }
}

package com.szys.junit.test;

import static org.junit.Assert.*;
 
import org.junit.Test;
 
import com.szys.junit.T;
 
public class Test {
 
    public void test() {
        int m=new T(1, 2).add();
        assertEquals(3, m);
        int n=new T(4, 3).minus();
        assertEquals(1,n);
        int x=new T(3, 4).mul();
        assertEquals(12,x);
        try {
        int y=new T(4, 4).div();
        assertEquals(1, y);
        }catch(Exception e){
            e.printStackTrace();
        }
    }
 
}

 加了try-catch语句。单元测试还是不太懂，有待提高！