如何使用迭代器?遍历Set集合?看这里

package com.set;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import com.class1.NewTitle;

public class SetDemo {
	public static void main(String[] args) {

		NewTitle  title1 = new NewTitle (1,"北京终于晴天了1","admin");
		
		NewTitle  title2 = new NewTitle (2,"北京终于晴天了2","admin");
		
		NewTitle  title3 = new NewTitle (3,"北京终于晴天了3","admin");
		
		NewTitle  title4 = new NewTitle (4,"北京终于晴天了4","admin");
		
		NewTitle  title5 = new NewTitle (5,"北京终于晴天了5","admin");
		
		Set set = new HashSet();
		set.add(title1);
		set.add(title2);
		set.add(title3);
		set.add(title4);
		set.add(title5);
		
		System.out.println("新闻总记录数: "+set.size());
		
		/**
		 * 
		 * 
		 * 遍历无序的集合 (1)增强型      (2)iterator迭代器
		 * 遍历有序的集合(1)普通for,遍历索引   (2)增强型for   (3)Iterator迭代器
		 * */
		
		System.out.println("-----------------使用for增强型----------------------");
		//遍历每条新闻信息
		for ( Object obj:set) {
			NewTitle title =(NewTitle) obj;
			System.out.println(title.getId()+"-"+title.getTitle());
		}
		
		
		System.out.println("-----------------使用迭代器遍历无序----------------------");
		//使用迭代器遍历
		Iterator itor =set.iterator(); //获得迭代器 itor
		//通过迭代器的迭代集合
		while( itor.hasNext()) { //判断下一个元素有没有,如果有往下移
			NewTitle title = (NewTitle) itor.next();
			System.out.println(title.getId()+"-"+title.getTitle());
		}
		
	}

}