Java ConcurrentHashMap containsValue() Method

by Online Tutorials Library July 22, 2022

Java ConcurrentHashMap containsValue() Method

The containsValue() method of ConcurrentHashMap class returns true if this map maps one or more keys to the specified value. Note: This method may require a full traversal of the map, and is much slower than method containsKey.

Syntax

Parameter

value – value whose presence in this map is to be tested

Returns

true if this map maps one or more keys to the specified value

Throws

NullPointerException

Example 1

  import java.util.*;   import java.util.concurrent.*;       public class ConcurrentHashMapcontainsValueExample1  {       public static void main(String[] args)       {           ConcurrentHashMap  mymap = new ConcurrentHashMap();               mymap.put(“AAA”, 10);           mymap.put(“BBB”, 15);           mymap.put(“CCC”, 25);           mymap.put(“DDD”, 255);           mymap.put(“EEE”,30);           System.out.println(” Mappings are: ” +mymap);             System.out.println(“is 255  present? ::  ”                             + mymap.containsValue(255));          }   }  ,>,>

Test it Now

Output:

Mappings are: {AAA=10, CCC=25, BBB=15, EEE=30, DDD=255}  is 255  present? ::  true

Example 2

  import java.util.concurrent.*;       public class ConcurrentHashMapcontainsValueExample2  {           public static void main(String[] args)       {           ConcurrentHashMap mapcon = new ConcurrentHashMap<>();           mapcon.put(“A”, 26);           mapcon.put(“B”, 98);           mapcon.put(“C”, 55);                  System.out.println(“ConcurrentHashMap values :n “+ mapcon.toString());             mapcon.computeIfPresent(“C”, (key , val)  -> val + 100);           System.out.println(“new ConcurrentHashMap after  computeIfPresent :n ” + mapcon);           System.out.println(” is 98 is present  :n ” + mapcon.containsValue(98));                 }   }  ,>

Test it Now

Output:

ConcurrentHashMap values :   {A=26, B=98, C=55}  new ConcurrentHashMap after  computeIfPresent :   {A=26, B=98, C=155}   is 98 is present  :   true

Next TopicJava ConcurrentHashMap

Java ConcurrentHashMap containsValue() Method

Java ConcurrentHashMap containsValue() Method

Syntax

Parameter

Returns

Throws

Example 1

Example 2

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