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TreeSet size() Method in Java

Last Updated : 26 Nov, 2018

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.

Tree_Set.size()

The method does not take any parameter.

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());
    }
}

TreeSet: [4, Geeks, To, TreeSet, Welcome]
The size of the set is: 5

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