set的三种遍历方式-----不能用for循环遍历（无序）

Posted 2020-10-23 做个快乐的自己

set的三种遍历方式，set遍历元素

list 遍历元素 
http://blog.csdn.net/sunrainamazing/article/details/71577662 
set遍历元素 
http://blog.csdn.net/sunrainamazing/article/details/71577893 
map遍历元素 
http://blog.csdn.net/sunrainamazing/article/details/71580051

package sun.rain.amazing.traversal;

import java.util.*;

/**
 * Created by sunRainAmazing on SUN_RAIN_AMAZING
 * @author sunRainAmazing
 */
public class TraversalSet {
    public static void main(String args[]){

        List<String> list = new ArrayList<>(
            Arrays.asList("tom","cat","Jane","jerry"));
        Set<String> set = new HashSet<>();
        set.addAll(list);



        //方法1 集合类的通用遍历方式, 从很早的版本就有, 用迭代器迭代
        Iterator it1 = set.iterator();
        while(it1.hasNext()){
            System.out.println(it1.next());
        }



        //方法2 集合类的通用遍历方式, 从很早的版本就有, 用迭代器迭代
        for(Iterator it2 = set.iterator();it2.hasNext();){
            System.out.println(it2.next());
        }



        //方法3 增强型for循环遍历
        for(String value: set){
            System.out.println(value);
        }


    }

}