JavaSE-Map的三种循环

public class Foreach {
    public static void main(String[] args) {
        Map<String, String> map = new HashMap<String, String>();
        
        //循环map的key的Set集合-->不推荐
        for (String key : map.keySet()) {
            //key
            String val = map.get(key);
        }
        
        //循环map的entry的Set集合-->最推荐的方式
        for (Entry<String, String> entry : map.entrySet()) {
            String key = entry.getKey();
            String val = entry.getValue();
        }
        
        //循环map的值-->只取值的推荐方式
        for (String val : map.values()) {
            String valOld = val;
        }
    }
}