Get the count of elements in HashMap in Java

Use the size() method to get the count of elements.

Let us first create a HashMap and add elements −

HashMap hm = new HashMap(); // Put elements to the map hm.put("Maths", new Integer(98)); hm.put("Science", new Integer(90)); hm.put("English", new Integer(97));

Now, get the size −

hm.size()

The following is an example to get the count of HashMap elements −

Example

 Live Demo

import java.util.*; public class Demo { public static void main(String args[]) { // Create a hash map HashMap hm = new HashMap(); // Put elements to the map hm.put("Maths", new Integer(98)); hm.put("Science", new Integer(90)); hm.put("English", new Integer(97)); hm.put("Physics", new Integer(91)); hm.put("Chemistry", new Integer(93)); // Get a set of the entries Set set = hm.entrySet(); // Get an iterator Iterator i = set.iterator(); // Display elements while(i.hasNext()) { Map.Entry me = (Map.Entry)i.next(); System.out.print(me.getKey() + ": "); System.out.println(me.getValue()); } System.out.println(); System.out.println("Count of elements = "+hm.size()); } }

Output

Maths: 98 English: 97 Chemistry: 93 Science: 90 Physics: 91 Size: 5