java迭代器逆序遍历,Java集合遍历之迭代器遍历

import java.util.ArrayList;

import java.util.Collection;

import java.util.Iterator;

public class Demo5_Iterator {

public static void main(String[] args) {

//demo1();

Collection c = new ArrayList();

c.add(new Student("张三", 23));                //Object obj = new Student("张三",23);

c.add(new Student("李四", 24));

c.add(new Student("王五", 25));

c.add(new Student("赵六", 26));

//获取迭代器

Iterator it = c.iterator();

while(it.hasNext()) {

//System.out.println(it.next());

Student s = (Student)it.next();            //向下转型

System.out.println(s.getName() + "..." + s.getAge());

}

}

public static void demo1() {

Collection c = new ArrayList();

c.add("a");

c.add("b");

c.add("c");

c.add("d");

//对集合中的元素迭代(遍历)

Iterator it = c.iterator();                    //获取迭代器

while(it.hasNext()) {

System.out.println(it.next());

}

}

}