遍历map

遍历map的常用方式一:键值都要

Map<Integer, Integer> map = new HashMap<Integer, Integer>(); 
for (<Integer, Integer> entry : ()) { 
  ("Key = " + () + ", Value = " + ()); 
}

遍历map的常用方式二:只要键或值

Map<Integer, Integer> map = new HashMap<Integer, Integer>(); 
//遍历map中的键 
for (Integer key : ()) { 
  ("Key = " + key); 
} 
//遍历map中的值 
for (Integer value : ()) { 
  ("Value = " + value); 
}