通过迭代器出错？

源自：4-6 学生选课—课程查询

通过迭代器出错？

public void testIterator() {
  //通过集合的iterator方法，取得迭代器的事例

   Iterator it = (Iterator) coursesToSelect.iterator();
   System.out.println("有如下课程待选(通过迭代器访问):");
   while(it.hasNext()) {
    Course cr =(Course)it.next();
    System.out.println("课程:" + cr.id+ ":" + cr.name);
   }
}

提问者：qq_匆匆那年_47 2018-09-09 10:10

个回答

慕码人5393438

2018-10-16 14:01:17

引入的包错了，iterator在多个包中都有时实现，你引入的是HTMLDocument.Iterator，正确的应该是：java.util.Iterator

2
qq_匆匆那年_47

2018-09-09 10:13:18

报错
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
The method hasNext() is undefined for the type HTMLDocument.Iterator
Type mismatch: cannot convert from void to Course
at com.imooc_collection.ListTest.testIterator(ListTest.java:90)
at com.imooc_collection.ListTest.main(ListTest.java:113)

0