Check If an Element Exists in Java TreeSet Example

Java TreeSet Examples

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• Create TreeSet in Java Example
• How to Create a TreeSet and Add New Elements to It
• Java TreeSet add(), first() and last() Method Example
• Remove First and Last Element from TreeSet in Java
• Remove Element from TreeSet in Java Example
• Remove All Elements from Java TreeSet Example
• Check If an Element Exists in Java TreeSet Example
• Iterating over a TreeSet using Java 8 forEach() Method
• Iterate over a TreeSet using Iterator in Java Example
• Iterate over TreeSet in Java Example

<__ This Java example shows how to check whether an element is contained in the Java TreeSet using contains() method.

Check If an Element Exists in Java LinkedHashSet Example

In the following example, we are checking whether TreeSet contains a "Ramesh" student object or not:

package com.javaguides.collections.treesetexamples;

import java.util.TreeSet;

public class AccessTreeSetElementsExample {
    public static void main(String[] args) {
        TreeSet < String > students = new TreeSet < > (String.CASE_INSENSITIVE_ORDER);

        students.add("Ramesh");
        students.add("John");
        students.add("Stark");
        students.add("Cruise");

        System.out.println("Students TreeSet : " + students);

        // Finding the size of a TreeSet
        System.out.println("Number of elements in the TreeSet : " + students.size());

        // Check if an element exists in the TreeSet
        String name = "Ramesh";
        if (students.contains(name)) {
            System.out.println("TreeSet contains the element : " + name);
        } else {
            System.out.println("TreeSet does not contain the element : " + name);
        }

    }
}

Output

Students TreeSet : [Cruise, John, Ramesh, Stark]
Number of elements in the TreeSet : 4
TreeSet contains the element : Ramesh