java集合列表

hashset 迭代获取元素

package imooc.chap01.vl;

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

public class test {
    public static void main(String[] args) {
        HashSet<String> set = new HashSet<>();
        set.add("西班牙");
        set.add("的");
        set.add("足球");
        Iterator<String> iterator = set.iterator();
        while (iterator.hasNext()){
            String text = iterator.next();
            System.out.println(text);

        }


    }
}

mapset 迭代获取元素

package imooc.chap01.vl;

import java.util.HashMap;
import java.util.Map;

public class test1 {
    public static void main(String[] args) {
        HashMap<String, String> map = new HashMap<>();
        map.put("第一个","西班牙");
        map.put("第二个","的");
        map.put("第三个","足球");
        for (Map.Entry<String,String> pair:
             map.entrySet()) {
            String key = pair.getKey();
            String value = pair.getValue();
            System.out.println(key+":"+value);


        }

    }
}