遍历Map

方法一使用Entry进行键值都需要时的遍历

 Map<Integer,Integer map = new Hashmap<Integer,Integer();
 for(Map.Entry<Integer,Integer entry:map.entrySet()){
   //获取键
     entry.getKey();
   //获取值
     entry.getValue();
 }

方法二在for-each循环中遍历keys或values

 Map<Integer, Integer map = new HashMap<Integer, Integer(); 
 //遍历map中的键 
 for (Integer key : map.keySet()) { 
   System.out.println("Key = " + key); 
 } 
 //遍历map中的值 
 for (Integer value : map.values()) { 
   System.out.println("Value = " + value); 
 }

方法三使用Iterator进行遍历 使用泛型：

 Map<Integer, Integer map = new HashMap<Integer, Integer(); 
 Iterator<Map.Entry<Integer, Integer entries = map.entrySet().iterator(); 
 while (entries.hasNext()) { 
   Map.Entry<Integer, Integer entry = entries.next(); 
   System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue()); 
 }

不使用泛型：

 Map map = new HashMap(); 
 Iterator entries = map.entrySet().iterator(); 
 while (entries.hasNext()) { 
   Map.Entry entry = (Map.Entry) entries.next(); 
   Integer key = (Integer)entry.getKey(); 
   Integer value = (Integer)entry.getValue(); 
   System.out.println("Key = " + key + ", Value = " + value); 
 }

参考链接：https://www.cnblogs.com/fqfanqi/p/6187085.html

Squirrellsf

Map的遍历方法总结

遍历Map