Showing posts with label hashmap. Show all posts

Sunday, 14 June 2015

How to Search Value in HashMap Java

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

public class HashMapSearchValue {

   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");

           System.out.println(" value john ="+hm.containsValue("john"));
           System.out.println(" value amit ="+hm.containsValue("amit"));

           System.out.println(" value piyush ="+hm.containsValue("piyush"));
           System.out.println(" value shivam ="+hm.containsValue("shivam"));

       }

}

Output;

value john =false

value amit =true

value piyush =false

value shivam =true

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