[ST2017] Lab1: Triangle type and Junit test

Lab1 3014218071 王汉超

Request:

Write a program with a function(getTriangleStatus) and test it, which takes three double number l1, l2, l3 as lengths of triangle sides and calculates whether the triangle is equilateral, isosceles, or scalene.

Contents:

一. 导入相应包

1.导入 JUnit, Hamcrest

右键项目名 -> 选择属性Properties -> 选择 Libraries -> 选择 JUnit4 -> Finish

2. 导入

Help -> Install new software -> Add -> Local -> 选择本地文件Eclemma路径 -> 安装, 安装后重启.

二、实验内容

1.Description

判断三角形类型的程序:

Input 三条边的长度(double): l1, l2, l3

Output 构成三角形类型(int): 1 -- 错误(边长不是正实数); 0 -- 不构成三角形, 1 -- 非等腰(scalene)三角形, 2 -- 等腰不等边(isosceles)三角形, 3 -- 等边(equilateral)三角形

2.Codes:

gitHub: https://github.com/E-C-Ares/ST2017_Lab1

Main.java:

package isTriangle;import java.util.Scanner;public class Main {public static int getTriangleStatus(double l1, double l2, double l3){int s = -1;double temp = 0;//l1 > l2 > l3if (l2 > l1){temp = l2;l2 = l1;l1 = temp;}if (l3 > l1){temp = l3;l3 = l1;l1 = temp;}if (l3 > l2){temp = l3;l3 = l2;l2 = temp;}if(l3 > 0){if(l1 >= l2 + l3){s = 0;}else if(l1 < l2 + l3){s = 1;if(l1 == l2 || l2 == l3){s ++;if(l1 == l3){s ++;}}}}return s;}@SuppressWarnings("resource")public static void main(String[] args){Scanner edges = new Scanner(System.in);System.out.println("输入三条边的长度："); double l1 = edges.nextDouble();      double l2 = edges.nextDouble();double l3 = edges.nextDouble();int s = getTriangleStatus(l1, l2, l3);switch (s){case -1:System.out.println("输入不符合要求"); break;case 0:System.out.println("不构成三角形");break;case 1:System.out.println("一般三角形");break;case 2:System.out.println("仅等腰三角形");break;case 3:System.out.println("等边三角形");break;}main(args);}
}

3.JUnit Test & Eclemma Cover:

为了避免污染源代码, 测试代码和源代码放置于不同的文件夹中:

右键项目 -> New -> JUnit Test Case -> 选择被测试函数: 截图如下:

MainTest.java:

package isTriangle;import static org.junit.Assert.*;import org.junit.Test;public class MainTest {Main t= new Main();//getTriangleStatus getStatus = new getTriangleStatus();
    @Testpublic void test1() {assertEquals("Should be an equilateral triangle", 3, t.getTriangleStatus(1.0, 1.0, 1.0));}@Testpublic void test2() {assertEquals("Should be an ERROR!", -1, t.getTriangleStatus(0, 0, 0));}@Testpublic void test3() {assertEquals("Should be an ERROR!", -1, t.getTriangleStatus(0, 1, 1));}@Testpublic void test4() {assertEquals("Should be an ERROR!", -1, t.getTriangleStatus(-0.01, 9.0, 9.0));}@Testpublic void test5() {assertEquals("Should be an isosceles triangle", 2, t.getTriangleStatus(2, 2, 3));}@Testpublic void test6() {assertEquals("Should be an isosceles triangle", 0, t.getTriangleStatus(1, 1, 2));}@Testpublic void test7() {assertEquals("Should be a scalene triangle", 1, t.getTriangleStatus(10.0000, 10.0001, 10.0002));}@Testpublic void test8() {assertEquals("Should be a scalene triangle", 1, t.getTriangleStatus(10.0000, 10.0001, 10.0002));}@Testpublic void test9() {assertEquals("Should be a scalene triangle", 1, t.getTriangleStatus(10.0000, 10.0001, 10.0002));}@Testpublic void test10() {assertEquals("Should be a scalene triangle", 1, t.getTriangleStatus(10.0000, 10.0001, 10.0002));}@Testpublic void test11() {assertEquals("Should be a scalene triangle", 1, t.getTriangleStatus(10.0, 9.0, 8.0));}    
}