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About 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.

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();
    treeSet.add("element_1");
    treeSet.add("element_2");
    treeSet.add("element_3");
 
    // 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);

  }
}

Output:

element_2 exists in TreeSet ? : true

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

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