集合类编程题（2），使用迭代器(2).zip

package workOne.first; import javax.lang.model.util.ElementScanner6; import java.util.ArrayList; import java.util.Iterator; public class First { public static void main(String[] args) { ArrayList<Student> list=new ArrayList<>(); list.add(0,new Student("001","zhangsan","男",18,"listen music")); list.add(1,new Student("002","xiaoli","男",18,"listen music")); list.add(2,new Student("003","xiaozhang","男",18,"listen music")); list.add(3,new Student("004","wangwu","男",18,"listen music")); System.out.println("集合中元素个数："+list.size()); for (Student a:list) { a.sayHi(); } list.get(1).setSex("女"); for(int i=0;i<list.size();i++) { if(list.get(i).getName().equals("zhangsan")) list.get(i).setHobby("cosplay"); } for (Student a:list) { a.sayHi(); } list.remove(list.size()-1); Iterator<Student> it=list.iterator(); while(it.hasNext()) { it.next().sayHi(); } list.removeAll(list); System.out.println("集合中元素个数："+list.size()); } }