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<String, Integer> 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()); 
    } 
} 

Test it Now

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<String , String>  mymap = new ConcurrentHashMap<String ,String>(); 

     ConcurrentHashMap<Integer , Integer>  mymap2 = new ConcurrentHashMap<Integer , Integer>(); 
     
      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));
   }    
}

Test it Now

Output:

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

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