0
点赞
收藏
分享

微信扫一扫

java Map 怎么遍历

Villagers 2023-04-20 阅读 111


评:

//最常规的一种遍历方法,最常规就是最常用的,虽然不复杂,但很重要,这是我们最熟悉的,就不多说了!! 

 public static void work(Map<String, Student> map) { 

 Collection<Student> c = map.values(); 

 Iterator it = c.iterator(); 

 for (; it.hasNext();) { 

 System.out.println(it.next()); 

 } 

 } 

  //利用keyset进行遍历,它的优点在于可以根据你所想要的key值得到你想要的 values,更具灵活性!! 

 public static void workByKeySet(Map<String, Student> map) { 

 Set<String> key = map.keySet(); 

 for (Iterator it = key.iterator(); it.hasNext();) { 

 String s = (String) it.next(); 

 System.out.println(map.get(s)); 

 } 

 } 

  //比较复杂的一种遍历在这里,呵呵~~他很暴力哦,它的灵活性太强了,想得到什么就能得到什么~~ 

 public static void workByEntry(Map<String, Student> map) { 

 Set<Map.Entry<String, Student>> set = map.entrySet(); 

 for (Iterator<Map.Entry<String, Student>> it = set.iterator(); it.hasNext();) { 

 Map.Entry<String, Student> entry = (Map.Entry<String, Student>) it.next(); 

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

 } 

 } 

}

举报

相关推荐

0 条评论