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Java program to check whether an item exists in a TreeSet collection or not

Given a TreeSet collection, we have to check whether an item exists in it or not.
Submitted by Nidhi, on June 05, 2022

Problem Solution:

In this program, we will create a TreeSet collection with integer elements. Then we will use contains() method to check whether an item exists in a TreeSet collection or not.

Program/Source Code:

The source code to check whether an item exists in a TreeSet collection or not is given below. The given program is compiled and executed successfully.

Example of TreeSet.contains() Method in Java

// Java program to check an item exist in 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(10);
    tree.add(20);
    tree.add(25);
    tree.add(30);

    if (tree.contains(35))
      System.out.println("Item exists.");
    else
      System.out.println("Item does not exist.");

    if (tree.contains(25))
      System.out.println("Item exists.");
    else
      System.out.println("Item does not exist.");
  }
}

Output:

Item does not exist.
Item exists.

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 used contains() method to check whether a specified item exists in the TreeSet collection or not, and printed the appropriate result.

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