Java ConcurrentHashMap toString() Method

by Online Tutorials Library July 22, 2022

Java ConcurrentHashMap toString() Method

The toString() method of ConcurrentHashMap class returns a string representation of this map. The string representation consists of a list of key-value mappings (in no particular order) enclosed in braces (“{}”).

Syntax

Parameter

No parameter is passed.

Returns

a string representation of this map

Throws

No exception is thrown.

Example 1

  import java.util.concurrent.*;       import java.util.*;       public class  ConcurrentHashMaptoStringExample1 {           public static void main(String[] args)       {             // crete a HashMap and add some values           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());            //replace the value of key k1 to 1000          mapcon.replace(“k1” , 1000);          System.out.println(“New HashMap after remove :n “+ mapcon.toString());       }   }   ,>

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Output:

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

Example 2

  import java.util.*;  import java.util.concurrent.ConcurrentHashMap;    public class ConcurrentHashMaptoStringExample2  {     public static void main(String args[]) {               ConcurrentHashMap  mymap = new ConcurrentHashMap();          ConcurrentHashMap  mymap2 = new ConcurrentHashMap();                mymap2.put(1, 101);        mymap2.put(2, 102);        mymap2.put(3, 103);        System.out.println(” mymap2 :” +mymap2.toString());        mymap.put(“AA”, “Java”);        mymap.put(“BB”, “angular”);        mymap.put(“CC”, “JavaScript”);        System.out.println(” mymap :” +mymap.toString());                System.out.println(“comparing mymap and mymap2 :” +mymap.equals(mymap2));     }      }  

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Output:

mymap2 :{1=101, 2=102, 3=103}   mymap :{AA=Java, BB=angular, CC=JavaScript}  comparing mymap and mymap2 :false

Next TopicJava ConcurrentHashMap

Java ConcurrentHashMap toString() Method

Java ConcurrentHashMap toString() Method

Syntax

Parameter

Returns

Throws

Example 1

Example 2

Java ConcurrentHashMap putIfAbsent() Method

Java Abstract Keyword

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