遍历Map的两种方法

如果单独遍历map的key推荐使用getKey(Map map)方法

package com.learn.java.map;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

/**
 *
 * 遍历map的key和value
 * @Author: HAOHAORUI
 * @Date: Create in 2:21 PM 2021/1/14
 * @Email: rhh0809@163.com
 */
public class Maplearn02 {

    public static void main(String[] args) {
        Map map = new HashMap();

        map.put("aa","11");

        map.put("bb","22");

        //遍历map的key和value
        getKeyAndValue(map);

        //遍历map中的key
        getkey(map);



    }

    /**
     * 遍历map的key和value
     * @param map
     */
    public static void getKeyAndValue(Map map){
        Set<Map.Entry<String,String>> set = map.entrySet();

        Iterator<Map.Entry<String,String>> iterable = set.iterator();

        while (iterable.hasNext()){
            Map.Entry<String,String> entry = iterable.next();

            System.out.println(entry.getKey()+"--"+entry.getValue());
        }
    }

    /**
     * 遍历map中的key
     * @param map
     */
    private static void getkey(Map map){
        Set<String> setkeys = map.keySet();

        for (String key:setkeys){
            System.out.println(key+"--"+map.get(key));
        }


    }
}