HashMap

• Type argument cannot be of primitive type
  HashMap<Integer,boolean> hashMap = new HashMap<Integer, boolean>();
  it should use Boolean instead of boolean;

hashMap.setEntry 是一个包装了每一个hashmap key-value的一个entry

for里面的内容左边是类型 这个函数的返回值类型为 Map.Entry<Integer,Boolean>

SO:this method return a Set view of the mapping contained in the map(hashmap)

Syntax:Set<Map.Entry<K,V>> entrySet()

``

	HashMap<Integer, Boolean> hashMap = new HashMap<Integer, Boolean>();
	hashMap.put(1,hashMap.containsValue(2));
	hashMap.put(4,hashMap.containsValue(2));
	for(Map.Entry<Integer,Boolean> entry : hashMap.entrySet()){
				System.out.println(entry.getKey()+":"+entry.getValue());
	}

``

标签：hashmap,entrySet,hashMap,Entry,entry,HashMap
来源： https://www.cnblogs.com/ldphoebe/p/16478867.html