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:
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 | 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.
