Get the size of the IdentityHashMap in Java

To get the size of IdentityHashMap, use the size() method. It returns the count of elements in the IdentityHashMap.

Let us first create a IdentityHashMap and add some elements to it

Map<String, Integer> m = new IdentityHashMap<String, Integer>();
m.put("1", 100);
m.put("2", 200);
m.put("3", 300);
m.put("4", 150);
m.put("5", 110);
m.put("6", 50);
m.put("7", 90);
m.put("8", 250);
m.put("9", 350);
m.put("10", 450);

Now, get the size

m.size();

The following is an example to get the size of the IdentityHashMap

Example

 Live Demo

import java.util.*;
public class Demo {
   public static void main(String[] args) {
      Map<String, Integer> m = newIdentityHashMap<String, Integer>();
      m.put("1", 100);
      m.put("2", 200);
      m.put("3", 300);
      m.put("4", 150);
      m.put("5", 110);
      m.put("6", 50);
      m.put("7", 90);
      m.put("8", 250);
      m.put("9", 350);
      m.put("10", 450);
      System.out.println("IdentityHashMap elements
"+ m);
      System.out.println("Size = " + m.size());
   }
}

The output is as follows

IdentityHashMap elements
{2=200, 4=150, 9=350, 7=90, 10=450, 6=50, 5=110, 8=250, 1=100, 3=300}
Size = 10