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Java IdentityHashMap isEmpty() Method with Example

IdentityHashMap Class isEmpty() method: Here, we are going to learn about the isEmpty() method of IdentityHashMap Class with its syntax and example.
Submitted by Preeti Jain, on March 06, 2020

IdentityHashMap Class isEmpty() method

  • isEmpty() method is available in java.util package.
  • isEmpty() method is used to check whether this IdentityHashMap is "empty" or "not empty".
  • isEmpty() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • isEmpty() method does not throw an exception at the time of checking the empty status of this IdentityHashMap.

Syntax:

    public boolean isEmpty();

Parameter(s):

  • It does not accept any parameter.

Return value:

The return type of the method is boolean, it returns true when this IdentityHashMap is "empty" or "non-empty".

Example:

// Java program to demonstrate the example 
// of boolean isEmpty() method of IdentityHashMap 

import java.util.*;

public class IsEmptyOfIdentityHashMap {
    public static void main(String[] args) {
        // Instantiates a IdentityHashMap object
        Map < Integer, String > map = new IdentityHashMap < Integer, String > ();

        // By using put() method is to add
        // key-value pairs in a IdentityHashMap
        map.put(10, "C");
        map.put(20, "C++");
        map.put(50, "JAVA");
        map.put(40, "PHP");
        map.put(30, "SFDC");

        // Display IdentityHashMap
        System.out.println("IdentityHashMap: " + map);

        // By using isEmpty() method is to
        // check whether this IdentityHashMap is
        // empty or not

        boolean status = map.isEmpty();

        // Display status
        System.out.print("map.isEmpty(): ");
        System.out.println(status);
    }
}

Output

IdentityHashMap: {20=C++, 40=PHP, 50=JAVA, 30=SFDC, 10=C}
map.isEmpty(): false






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