Check if a HashMap is empty in Java

Use the isEmpty() method to check of a HashMap is empty or not. Let us first create the HashMap −

HashMap hm = new HashMap();

Now, add some elements −

hm.put("Bag", new Integer(1100)); hm.put("Wallet", new Integer(700)); hm.put("Belt", new Integer(600));

Since, we added elements above, therefore, the HashMap isn’t empty. Let us check −

set.isEmpty()

The following is an example to check if a HashMap is empty or not −

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("Bag", new Integer(1100)); hm.put("Wallet", new Integer(700)); hm.put("Belt", new Integer(600)); // 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("Is the HashMap with empty elements? "+set.isEmpty()); } }

Output

Belt: 600 Wallet: 700 Bag: 1100 Is the HashMap with empty elements? False