Check for element existence in TreeSet example

With this example we are going to demonstrate how to check for an element existence in a TreeSet in Java. In short, to check if an element exists in a TreeSet or not you should:

  • Create a new TreeSet.
  • Populate the set with elements, with add(E e) API method of TreeSet.
  • Invoke contains(Object o) API method of TreeSet, with a specific element as parameter. The method returns true, if the set contains the specified element.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

import java.util.TreeSet;
public class ElementExistsTreeSet {
  public static void main(String[] args) {
    // Create a TreeSet and populate it with elements
    TreeSet treeSet = new TreeSet();
    // boolean contains(Object value) method returns true if the TreeSet contains the value, otherwise false.
    boolean exists = treeSet.contains("element_2");
    System.out.println("element_2 exists in TreeSet ? : " + exists);



element_2 exists in TreeSet ? : true

This was an example of how to to check if an element exists in a TreeSet in Java.

Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.
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