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Java TreeSet size() Method with Example

TreeSet Class size() method: Here, we are going to learn about the size() method of TreeSet Class with its syntax and example.
Submitted by Preeti Jain, on February 20, 2020

TreeSet Class size() method

• size() method is available in java.util package.
• size() method is used to return the cardinality or size (i.e. the number of objects exists) of this TreeSet.
• size() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• size() method does not throw an exception at the time of returning size.

Syntax:

    public int size();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is int, it returns the size of this TreeSet.

Example:

// Java program to demonstrate the example 
// of int size() method of TreeSet 

import java.util.*;

public class SizeOfTreeSet {
    public static void main(String[] args) {
        // Instantiates a TreeSet object
        TreeSet < String > tree_set = new TreeSet < String > ();

        // By using add() method is to add
        // the given object of this TreeSet 
        tree_set.add("C");
        tree_set.add("C++");
        tree_set.add("JAVA");
        tree_set.add("PHP");
        tree_set.add("SFDC");

        // Display TreeSet
        System.out.println("TreeSet: " + tree_set);

        // By using size() method is to
        // return the size of this TreeSet
        int size = tree_set.size();

        // Display size
        System.out.println("tree_set.size(): " + size);
    }
}

Output

TreeSet: [C, C++, JAVA, PHP, SFDC]
tree_set.size(): 5