Chat yesterday and colleagues, he said to traverse all values map out; suddenly skull stuck;
So he consolidated the case; there is something wrong, correct comments are welcome;
Map of common methods
map.put (); was added ;
as map.get (key); obtaining a corresponding key of the values;
map.values (); obtaining map all the values values ;
map.keySet (); get all the key values
map.size (); the size of the length of the element
EnumMap.entrySet (); acquiring map of all elements , k1 = v2, k2 = v2 , ....... form output ;
map.remove (key); removing the respective key element ;
map.putAll (map1); the element into the map map1;
During the preparation process, a phenomenon found: if (kv) of map two types of inconsistencies, such as map --- (1, "a"); map1 --- ( "1", "b");
map.putAll performed (map1); ---- map output is:
[1=a, 1=b]
JDK8 add new features lambda expression to traverse Map method --Map.forEach ();
Map.forEach((k,v)->{
System.out.println(k+":"+v);
});
Case are as follows :
