一、junit和hamcrest安装及引入
　　1.输入网址http://junit.org/junit4/下载junit及hamcrest
　　2.打开Eclipse新建一个project
　　3.右键点击build path 引进junit

　　二、eclemma安装
　　点击help-->Eclipse Marketplace-->在find中输入eclemma-->install-->重启Eclipse
　　三、三角形问题及junit、hamcrest、eclemma的使用
　　1、编写三角形判断程序
public class triangle_problem {
String triangle_juidje(double a，double b， double c){
if(a == b && a == c){
String str = new String();
str = "the trangle is equilateral";
return str;
}
if((a+b)>c &&(a+c)>b &&(b+c)>a){
if((a == b && a != c)|| (a==c && a != b) || (b == c && b != a)){
String str = new String();
str = "the trangle is isosceles";
return str;
}
if(a!=b && b!=c){
String str = new String();
str = "the trangle is scalene";
return str;
}
}
else{
String str = new String();
str = "the three edges can't make up a trangle!";
return str;
}
return null;
}
}
　　2、junit类生成
　　选中类-->new-->jUnit Test Case

　　3、编辑junit内容
import static org.junit.Assert.*;
import org.junit.Test;
public class triangle_problemTest {
private triangle_problem tri;
@Test
public void testequilateral() {
tri = new triangle_problem();
assertEquals("the trangle is equilateral"，tri.triangle_juidje(3，3，3));
}
@Test
public void testisosceles() {
tri = new triangle_problem();
assertEquals("the trangle is isosceles"，tri.triangle_juidje(2，3，2));
}
@Test
public void testscalene() {
tri = new triangle_problem();
assertEquals("the trangle is scalene"，tri.triangle_juidje(2，3，4));
}
@Test
public void testnottrangle() {
tri = new triangle_problem();
assertEquals("the three edges can't make up a trangle!"，tri.triangle_juidje(2，3，5));
}
}
　　4、运行junit文件

　　5、运行eclemma