Java ConcurrentHashMap put() Method

by Online Tutorials Library July 22, 2022

Java ConcurrentHashMap put() Method

The put() method of ConcurrentHashMap class maps the specified key to the specified value in this table.

Syntax

Parameter

key – key with which the specified value is to be associated

value – value to be associated with the specified key

Returns

The previous value associated with key, or null if there was no mapping for key

Throws

NullPointerException.

Example 1

  import java.util.*;   import java.util.concurrent.*;       public class ConcurrentHashMapputExample1   {       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);           //  print statement          System.out.println(“is 255  present? ::  “+ mymap.containsValue(255));  //checks if 255 is in the concurrentHashmap       }   }  ,>,>

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Output:

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

Example 2

  import java.util.*;   import java.util.concurrent.*;       public class ConcurrentHashMapputExample2  {       public static void main(String[] args)       {           ConcurrentHashMap  map = new ConcurrentHashMap();           // put values in  ConcurrentHashMap          map.put(“java”, 10);           map.put(“.net”, 15);           map.put(“python”, 20);           map.put(“c”, 25);           map.put(“c++”, 30);            // print statement          System.out.println(” Mappings are: ” +map);           System.out.println(“is java  present? ::  ” + map.containsKey(“java”));  //print statement      }   }  ,>,>

Test it Now

Output:

Mappings are: {python=20, c++=30, java=10, c=25, .net=15}  is java  present? ::  true

Next TopicJava ConcurrentHashMap

Java ConcurrentHashMap put() Method

Java ConcurrentHashMap put() Method

Syntax

Parameter

Returns

Throws

Example 1

Example 2

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