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()