How to get size of HashMap

To get size of HashMap we use the int size() method provided by Map API.

The size method returns the number of key/value pairs that are available in that Map.

Example : Get Size of HashMap

package com.kscodes.sampleproject;

import java.util.HashMap;

import java.util.Map;

public class HashMapExample {

public static void main(String[] args) {

Map<String, String> hashMap = new HashMap<String, String>();

System.out.println("Hashmap size is :: " + hashMap.size());

hashMap.put("USD", "American Dollar");

hashMap.put("AUD", "Australian Dollar");

hashMap.put("EUR", "Euro");

hashMap.put("JPY", "Japan Yen");

System.out.println("After adding some elements Hashmap size is :: " + hashMap.size());

}

1 2	Hashmap size is :: 0 After adding some elements Hashmap size is :: 4