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.
