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Java program to get the size of a TreeSet collection

Given a TreeSet collection, we have to get the size of it.
Submitted by Nidhi, on June 08, 2022

Problem statement

In this program, we will create a TreeSet collection with integer elements. Then we will get the size of a TreeSet collection using the size() method.

Source Code

The source code to get the size of a TreeSet collection is given below. The given program is compiled and executed successfully.

Example of TreeSet.size() Method in Java

// Java program to get size of a 
// TreeSet collection

import java.io.*;
import java.util.*;

public class Main {
  public static void main(String args[]) {
    TreeSet < Integer > tree = new TreeSet < Integer > ();

    tree.add(30);
    tree.add(20);
    tree.add(25);
    tree.add(10);

    System.out.println("TreeSet: " + tree);
    System.out.println("Size of TreeSet: " + tree.size());
  }
}

Output

TreeSet: [10, 20, 25, 30]
Size of TreeSet: 4

Explanation

In the above program, we imported the "java.util.*", "java.io.*" packages to use the TreeSet class. Here, we created a public class Main.

The Main class contains a main() method. The main() method is the entry point for the program. And, created a TreeSet collection tree and added integer elements using add() method. Then we got the size of the TreeSet collection using the size() method and printed the result.

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