代码：

代码：

public class TestGeneric {

//带有泛型List的构造器

public List<Course> courses;

public void TestGeneric(){

this.courses = new ArrayList<Course>();

}

public void testAdd(){

Course cr1 = new Course("1","大学语文");

courses.add(cr1);

Course cr2 = new Course("2","Java基础");

courses.add(cr2);

/*courses.add("添加进新的方法");*///泛型：这里不能这样写

}

public void testForEach(){

for(Course cr:courses){

System.out.println(cr.id+cr.name);

}

}

public static void main(String[] args){

TestGeneric tg = new TestGeneric();

tg.testAdd();

tg.testForEach();

}

}