The syntax of the size() method is:
hashmap.size() Here, hashmap is an object of the HashMap class.
size() Parameters
The size() method does not take any parameters.
size() Return Value
- returns the number of key/value mappings present in the hashmap
Example: Java HashMap size()
import java.util.HashMap; class Main { public static void main(String[] args) { // create an HashMap HashMap<String, String> countries = new HashMap<>(); // insert keys/values to the HashMap countries.put("USA", "Washington"); countries.put("UK", "London"); countries.put("Canada", "Ottawa"); System.out.println("HashMap: " + countries); // get the number of keys/values from HashMap int size = countries.size(); System.out.println("Size of HashMap: " + size); } } Output
HashMap: {Canada=Ottawa, USA=Washington, UK=London} Size of HashMap: 3 In the above example, we have created a hashmap named countries. Here, we have used the size() method to get the number of key/value mappings present in the hashmap.
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