Java ConcurrentHashMap containsKey() Method

by Online Tutorials Library July 22, 2022

Java ConcurrentHashMap containsKey() Method

The containsKey() method of ConcurrentHashMap class tests if the specified object is a key in this table.

Syntax

Parameter

key – possible key

Returns

true if and only if the specified object is a key in this table, as determined by the equals method; false otherwise

Throws

NullPointerException

Example 1

  import java.util.*;   import java.util.concurrent.*;       public class ConcurrentHashMapcontainsKeyExample1  {       public static void main(String[] args)       {           ConcurrentHashMap  map = new ConcurrentHashMap();               map.put(“java”, 10);           map.put(“.net”, 15);           map.put(“python”, 20);           map.put(“c”, 25);           map.put(“c++”, 30);             System.out.println(” Mappings are: ” +map);             System.out.println(“is java  present? ::  ” + map.containsKey(“java”));   //check if map contains key javascript         }   }   ,>,>

Test it Now

Output:

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

Example 2

  import java.util.*;   import java.util.concurrent.*;       public class ConcurrentHashMapcontainsKeyExample2  {       public static void main(String[] args)       {           ConcurrentHashMap  map = new ConcurrentHashMap();               map.put(“java”, 10);           map.put(“.net”, 15);           map.put(“python”, 20);           map.put(“c”, 25);           map.put(“c++”, 30);             System.out.println(” Mappings are: ” +map);   //print the map            System.out.println(“is javascript  present? ::  “+ map.containsKey(“javascript”));   //check if map contains key javascript         }   }  ,>,>

Test it Now

Output:

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

Next TopicJava ConcurrentHashMap

Java ConcurrentHashMap containsKey() Method

Java ConcurrentHashMap containsKey() Method

Syntax

Parameter

Returns

Throws

Example 1

Example 2

Java Array getShort() Method

Java ConcurrentHashMap remove() Method

You may also like