Last Updated : 17 Mar 2025

The size() method of Java HashSet class is used to get the number of elements in this HashSet (its cardinality).

Syntax

Following is the declaration of size() method:

Parameter

This method does not accept any parameter.

Returns

The size() method returns the number of elements present in the HashSet.

Exceptions

NA

Compatibility Version

Java 1.2 and above

Example 1

Output:

HashSet: [Vijay, Mohan, Ravi, Ajay]
The size of the set is: 4

Example 2

Output:

Example 3

Output:

Size of student database is: 4