ConcurrentHashMap isEmpty() Method in Java


The isEmpty() method of java.util.concurrent.ConcurrentHashMap is an in-built function in Java which checks if this map contains any key-value mappings and returns a boolean value.

Syntax:

public boolean isEmpty()

Return Value: The function returns a boolean value. It returns true if the ConcurrentHashMap is empty and returns false otherwise.



Below programs illustrate the use of isEmpty() method :

Program 1: In this program the ConcurrentHashMap is non-empty.

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program Demonstrate isEmpty()
// method of ConcurrentHashMap */
  
import java.util.concurrent.*;
  
class ConcurrentHashMapDemo {
    public static void main(String[] args)
    {
  
        ConcurrentHashMap<Integer, String>
            chm = new ConcurrentHashMap<Integer, String>();
  
        chm.put(100, "Geeks");
        chm.put(101, "for");
        chm.put(102, "Geeks");
  
        // Checking for the emptiness of Map
        if (chm.isEmpty()) {
            System.out.println("The ConcurrentHashMap"
                               + " is empty.");
        }
        else {
            // Displaying the ConcurrentHashMap
            System.out.println("The Mappings are: "
                               + chm);
        }
    }
}

chevron_right






                        filter_none









Output:


The Mappings are: {100=Geeks, 101=for, 102=Geeks}





Program 2:In this program the ConcurrentHashMap is non-empty.











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















// Java Program Demonstrate isEmpty() 


// method of ConcurrentHashMap */ 


  


import java.util.concurrent.*; 


  


class GFG { 


    public static void main(String[] args) 


    { 


  


        ConcurrentHashMap chm = new ConcurrentHashMap(); 


  


        // Checking for the emptiness of Map 


        if (chm.isEmpty()) { 


            System.out.println("The ConcurrentHashMap"


                               + " is empty."); 


        } 


        else { 


            // Displaying the ConcurrentHashMap 


            System.out.println("The Mappings are: "


                               + chm); 


        } 


    } 


} 



















                        chevron_right







                        filter_none









Output:


The ConcurrentHashMap is empty.





Reference : https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentHashMap.html#isEmpty()



          
          
          
          

            

    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts:
RICHIK BHATTACHARJEE
Check out this Author's contributed articles.
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on  the "Improve Article" button below.