Java ConcurrentHashMap hashCode() Method

by Online Tutorials Library July 22, 2022

Java ConcurrentHashMap hashcode() Method

The hashcode() method of ConcurrentHashMap class returns the hash code value for this Map, i.e., the sum of, for each key-value pair in the map, key.hashCode() ^ value.hashCode().

Syntax

Parameter

No parameter is passed.

Returns

the hash code value for this map.

Throws

NullPointerException.

Example 1

  //import statement  import java.util.*;  import java.util.concurrent.ConcurrentHashMap;    public class ConcurrentHashMaphashcodeExample1   {     public static void main(String args[]) {               ConcurrentHashMap  mymap = new ConcurrentHashMap();          ConcurrentHashMap  mymap2 =  mymap;         mymap.put(“AA”, “Java”);        mymap.put(“BB”, “angular”);        mymap.put(“CC”, “JavaScript”);         //print statements.        System.out.println(“comparing mymap and mymap2 :” +mymap.equals(mymap2));        System.out.println(“comparing mymap and mymap2 :” +mymap.hashCode());     }      }  

Test it Now

Output:

import java.util.concurrent.*;        import java.util.*;       public class ConcurrentHashMaphashcodeExample2 {           public static void main(String[] args)       {           HashMap mapcon               = new HashMap<>();           mapcon.put("k1", 100);           mapcon.put("k2", 200);           mapcon.put("k3", 300);           mapcon.put("k4", 400);           System.out.println("HashMap values :n " + mapcon.toString());            mapcon.computeIfAbsent("k5", k -> 200 + 300);           mapcon.computeIfAbsent("k6", k -> 60 * 10);           System.out.println("New HashMap after computeIfAbsent :n "+ mapcon.hashCode());       }   }  ,>

Example 2

  HashMap values :   {k1=100, k2=200, k3=300, k4=400}  New HashMap after computeIfAbsent :   20543  

Test it Now

Output:

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