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Java ArrayDeque removeFirstOccurrence() Method with Example

ArrayDeque Class removeFirstOccurrence() method: Here, we are going to learn about the removeFirstOccurrence() method of ArrayDeque Class with its syntax and example.
Submitted by Preeti Jain, on January 17, 2020

ArrayDeque Class removeFirstOccurrence() method

• removeFirstOccurrence() method is available in java.lang package.
• removeFirstOccurrence() method is used to remove the first occurrence of the given element in this deque.
• removeFirstOccurrence() 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.
• removeFirstOccurrence() method does not throw an exception at the time of removing the first occurrence of the given object.

Syntax:

    public boolean removeFirstOccurrence (Object obj);

Parameter(s):

• Object obj – represents the element to be removed of the first occurrence from this deque.

Return value:

The return type of this method is boolean, it returns true if the given element is removed successfully, else it returns false.

Example:

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

import java.util.*;

public class RemoveFirstOccurrenceOfArrayDeque {
    public static void main(String[] args) {
        // Creating an ArrayDeque with initial capacity of
        // storing elements
        Deque < 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");
        d_queue.add("Java");

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

        System.out.println();

        // By using removeFirstOccurrence() method to remove
        // the first occurrence of the given element "Java"
        d_queue.removeFirstOccurrence("Java");
        System.out.println();

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

Output

d_queue before removeFirstOccurrence(): 
ArrayDeque Elements = [C, C++, Java, Php, DotNet, Java]


d_queue after removeFirstOccurrence(): 
ArrayDeque Elements = [C, C++, Php, DotNet, Java]