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Sunday, 14 June 2015

How to Search key in HashMap Java


import java.util.HashMap;
import java.util.Map;

public class HashMapSearchKey {
    public static void main(String[] args) {
       
    Map<Integer,String> hm = new HashMap<Integer,String>();
       
    /*
     * Associates the specified value with the specified key in
       this map (optional operation). If the map previously
       contained a mapping for the key, the old value is
       replaced by the specified value
     */
        hm.put(1,"ankush");
        hm.put(2, "amit");
        hm.put(3,"shivam");
        hm.put(4,"ankit");
        hm.put(5, "yogesh");
       
        /*
         * Returns true if this map contains a
         *  mapping for the specified key
         */
   
    System.out.println("key  1   ="+hm.containsKey(1));
    System.out.println("key  20  ="+hm.containsKey(20));
    System.out.println("key 9    ="+hm.containsKey(9));
    System.out.println("key  5   ="+ hm.containsKey(5));
       
    }
}


Output:
key  1   =true

key  20  =false

key 9    =false

key  5   =true


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