Search a value for a given key in a HashMap

To decalare the hashMap use this:

 HashMap<Integer,String> hm=new HashMap<Integer,String>();

To enter the elements in the HashMap:

 hm.put(1,"January");
 hm.put(2,"Febuary");

before searching element first check that the enter number is present in the hashMap for this use the method containsKey() which will return a Boolean value:

 if(hm.containsKey(num))
 {
    hm.get(num);
 }

Just call get:

HashMap<String, String> map = new HashMap<String, String>();
map.put("x", "y");

String value = map.get("x"); // value = "y"