The java.util.Set.size() method is used to get the size of the Set or the number of elements present in the Set.
Syntax:
int size()
Parameters: This method does not takes any parameter.
Return Value: The method returns the size or the number of elements present in the Set.
Below program illustrate the java.util.Set.size() method:
// Java code to illustrate Set.size() method  import java.util.*;  public class SetDemo {    public static void main(String args[])    {        // Creating an empty Set        Set<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 Set        System.out.println("Set: " + set);          // Displaying the size of the Set        System.out.println("The size of the set is: " + set.size());    }} |
Output:
Set: [4, Geeks, Welcome, To] The size of the set is: 4
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Set.html#size()
