package testTriangle;

import static org.junit.Assert.*;

import java.util.Arrays;

import java.util.Collection;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.junit.runners.Parameterized;

import org.junit.runners.Parameterized.Parameters;

import triangle.triangle;

@RunWith(Parameterized.class)

public class testTriangle {

    private int a;

    private int b;

    private int c;

    private String expected;

    public testTriangle(int a,int b, int c, String expected){

        this.a = a;

        this.b = b;

        this.c = c;

        this.expected= expected;

        }

    @Parameters

    public static Collection<Object[]> getData(){

    return Arrays.asList(new Object[][]{

    {3,3,3,"equilateral"},

    {1,2,3,"scalene"},

    {5,5,7,"isosceles"},

    {4,6,6,"isosceles"}

    });

    }

    @Test

    public void test() {

    assertEquals(this.expected,triangle.triangleshape(a,b,c));

    }

}

package triangle;

public class triangle {

    public static String triangleshape(int a,int b, int c){

        if( (a + b) < c||(a - b) > c){

            return "error";

        }//判断是否符合三角形三条边的情况，即两边之和大于第三边，两边之差小于第三边；

        if(a == b && a == c && b == c){

            return "equilateral";

        }//三条边相等即为等边三角形

        else if(a == b || a == c || b == c){

            return "isosceles";

        }//任意两边相等即为等腰三角形，并且等边三角形也是等腰三角形

        else{

            return "scalene";

        }//否则为不等边三角形

        }

}