public void testIterator() {

//Iterator是一个接口

Iterator it = coursesToSelect.iterator();

System.out.println("有以下待选课程(通过迭代器访问)");

while(it.hasNext()) {

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

System.out.println("课程:"+cr.id+"-"+cr.name);

}

}

public void testForEach() {

System.out.println("有以下待选课程(通过for each 访问)");

for(Object obj:coursesToSelect) {

Course cr =(Course) obj;

System.out.println("课程:"+cr.id+"-"+cr.name);