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Java program to get the smallest item from the TreeSet collection

Given a TreeSet collection, we have to get the smallest item from it.
Submitted by Nidhi, on June 06, 2022

Problem statement

In this program, we will create a TreeSet collection with integer elements. Then we will find the smallest item from the TreeSet collection using the first() method.

Source Code

The source code to get the smallest item from the TreeSet collection is given below. The given program is compiled and executed successfully.

Example of TreeSet.first() Method in Java

// Java program to get the smallest item from 
// 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);

    int small = tree.first();

    System.out.println("Smallest item in TreeSet is: " + small);
  }
}

Output

Smallest item in TreeSet is: 10

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 found the smallest item from the TreeSet collection using the first() method and printed the result.

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