来看看这个令人奇怪的问题哦

package CourseToSelect;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

public class ListTest {

List<Course> coursesToSelect ;

public ListTest(){

coursesToSelect = new ArrayList<Course>();

}

public void Add(){

   Course cr1 = new Course("1","数据结构");

   coursesToSelect.add(cr1);

   Course temp;

   Course course[] = {new Course("2","C语言"),new Course("3","高数") };

  temp =  (Course)coursesToSelect.get(0);

  System.out.println("添加了课程："+temp.ID+":"+temp.Name);;

}

public static void main(String[] args) {

ListTest lt = new ListTest();

//lt.Add();

Iterator<Course> it = lt.coursesToSelect.listIterator();

while(it.hasNext()){

Course temp = (Course)it.next();

System.out.println("添加了课程："+temp.ID+":"+temp.Name); }

}

}

为什么运行不出结果呢？？？？？真是令人疑惑