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Java ArrayDeque contains() Method with Example

ArrayDeque Class contains() method: Here, we are going to learn about the contains() method of ArrayDeque Class with its syntax and example.
Submitted by Preeti Jain, on January 09, 2020

ArrayDeque Class contains() method

• contains() Method is available in java.lang package.
• contains() Method is used to check whether the given element exists or not exists in the deque.
• contains() Method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• contains() Method does not throw an exception at the time of checking the given element that exists in the deque.

Syntax:

    public boolean contains(Object obj);

Parameter(s):

• Object obj – represents the element to be checked as existence in deque.

Return value:

The return type of the method is boolean, it returns true if the given element exists in this deque, else it returns false.

Example:

// Java program to demonstrate the example 
// of boolean contains(Object obj) method of ArrayDeque 

import java.util.*;

public class ContainsOfArrayDeque {
    public static void main(String[] args) {
        // Creating an ArrayDeque with initial capacity of
        // storing elements
        ArrayDeque < String > d_queue = new ArrayDeque < String > (10);

        // By using add() method to add elements
        // in ArrayDeque
        d_queue.add("C");
        d_queue.add("C++");
        d_queue.add("Java");
        d_queue.add("Php");
        d_queue.add("DotNet");

        // Display Deque Elements
        System.out.println("d_queue : ");
        System.out.println("ArrayDeque Elements = " + d_queue);

        // By using contains() method to check the existing
        // element in ArrayDeque
        boolean b = d_queue.contains("Java");

        System.out.println();

        // Display Deque Elements
        System.out.println("d_queue.contains Java: ");
        System.out.println("Is d_queue contains element :: java - " + b);
    }
}

Output

d_queue : 
ArrayDeque Elements = [C, C++, Java, Php, DotNet]

d_queue.contains Java: 
Is d_queue contains element :: java - true