The Java.util.TreeSet.size() method is used to get the size of the Tree set or the number of elements present in the Tree set.
Syntax:
Tree_Set.size()
Parameters: The method does not take any parameter.
Return Value: The method returns the size or the number of elements present in the Set.
Below program illustrates the use of Java.util.TreeSet.size() method:
// Java code to illustrate size() import java.util.*;
import java.util.TreeSet;
public class TreeSetDemo {
public static void main(String args[])
{
// Creating an empty TreeSet
TreeSet<String> tree = new TreeSet<String>();
// Use add() method to add elements into the Set
tree.add( "Welcome" );
tree.add( "To" );
tree.add( "Geeks" );
tree.add( "4" );
tree.add( "Geeks" );
tree.add( "TreeSet" );
// Displaying the TreeSet
System.out.println( "TreeSet: " + tree);
// Displaying the size of the set
System.out.println( "The size of the set is: " + tree.size());
}
} |
Output:
TreeSet: [4, Geeks, To, TreeSet, Welcome] The size of the set is: 5