The Java.util.HashSet.size() method is used to get the size of the HashSet or the number of elements present in the HashSet.
Syntax:
Hash_Set.size()
Parameters: This method does not takes any parameter.
Return Value: The method returns the size or the number of elements present in the HashSet.
Below program illustrate the Java.util.HashSet.size() method:
// Java code to illustrate HashSet.size() methodimport java.util.*;import java.util.HashSet;  public class HashSetDemo {    public static void main(String args[])    {        // Creating an empty HashSet        HashSet<String> set = new HashSet<String>();          // Use add() method to add elements into the Set        set.add("Welcome");        set.add("To");        set.add("Geeks");        set.add("4");        set.add("Geeks");          // Displaying the HashSet        System.out.println("HashSet: " + set);          // Displaying the size of the HashSet        System.out.println("The size of the set is: " + set.size());    }} |
Output:
HashSet: [4, Geeks, Welcome, To] The size of the set is: 4
