ArrayDeque removeFirstOccurrence() Method in Java Last Updated : 10 Dec, 2018 Comments Improve Suggest changes Like Article Like Report The java.util.ArrayDeque.removeFirstOccurrence(Object) method in Java is used to remove the first occurrence of a specific element from this deque. If the element is present only once, then that element is removed and true is returned. If no such element is removed then false is returned. Syntax: Array_Deque.removeFirstOccurrence(Object O) Parameters: The method takes one parameter O of ArrayDeque type and refers to the element whose first occurrence is to be removed. Return Value: This method returns true if the element is present in the map else it returns false. Below programs illustrate the Java.util.ArrayDeque.removeFirstOccurrence() method: Program 1: Java // Java code to illustrate removeFirstOccurrence() import java.util.*; public class ArrayDequeDemo { public static void main(String args[]) { // Creating an empty ArrayDeque Deque<String> de_que = new ArrayDeque<String>(); // Use add() method to add elements into the Deque de_que.add("Welcome"); de_que.add("To"); de_que.add("Geeks"); de_que.add("For"); de_que.add("Geeks"); // Displaying the ArrayDeque System.out.println("Initial ArrayDeque: " + de_que); // Removing elements using removeFirstOccurrence() method de_que.removeFirstOccurrence("Geeks"); de_que.removeFirstOccurrence("For"); // Displaying the ArrayDeque after removal System.out.println("ArrayDeque after removing " + "elements: " + de_que); } } Output: Initial ArrayDeque: [Welcome, To, Geeks, For, Geeks] ArrayDeque after removing elements: [Welcome, To, Geeks] Program 2: Java // Java code to illustrate removeFirstOccurrence() import java.util.*; public class ArrayDequeDemo { public static void main(String args[]) { // Creating an empty ArrayDeque Deque<Integer> de_que = new ArrayDeque<Integer>(); // Use add() method to add elements into the Deque de_que.add(10); de_que.add(10); de_que.add(30); de_que.add(10); de_que.add(30); // Displaying the ArrayDeque System.out.println("Initial ArrayDeque: " + de_que); // Removing elements using removeFirstOccurrence() method de_que.removeFirstOccurrence(30); de_que.removeFirstOccurrence(5); // Displaying the ArrayDeque after removal System.out.println("ArrayDeque after removing " + "elements: " + de_que); } } Output: Initial ArrayDeque: [10, 10, 30, 10, 30] ArrayDeque after removing elements: [10, 10, 10, 30] Comment More infoAdvertise with us Next Article ArrayDeque removeFirstOccurrence() Method in Java chinmoy lenka Follow Improve Article Tags : Misc Java Java-Collections Java - util package Java-Functions Java-ArrayDeque +2 More Practice Tags : JavaJava-CollectionsMisc Similar Reads ArrayDeque offerFirst() Method in Java The Java.util.ArrayDeque.offerFirst(Object element) method in Java is used to add a specific element at the front of the Deque. The function is similar to the addFirst() method of ArrayDeque in Java. Syntax: Array_Deque.offerFirst(Object element) Parameters: The parameter element is of the type Arra 2 min read ArrayDeque offerLast() Method in Java The Java.util.ArrayDeque.offerLast(Object element) method in Java is used to add a specific element at the end of this Deque. The function is similar to the addLast(), add() and offer() method of ArrayDeque in Java. Syntax: Array_Deque.offerLast(Object element) Parameters: The parameter element is o 2 min read ArrayDeque peek() Method in Java The java.util.ArrayDeque.peek() method in Java is used to retrieve or fetch the element at the head of the Deque. The element retrieved does not get deleted or removed from the Queue instead the method just returns it. If no element is present in the deque then Null is returned. Syntax: Array_Deque. 2 min read ArrayDeque peekFirst() Method in Java The java.util.ArrayDeque.peekFirst() method in Java is used to retrieve or fetch the first element of the deque. The element retrieved does not get deleted or removed from the Queue instead the method just returns it. If no element is present in the deque or it is empty, then Null is returned. Synta 2 min read ArrayDeque peekLast() Method in Java The java.util.ArrayDeque.peekLast() method in Java is used to retrieve or fetch the last element of the deque. The element retrieved does not get deleted or removed from the Queue instead the method just returns it. If no element is present in the deque or it is empty, then Null is returned. Syntax: 2 min read ArrayDeque poll() Method in Java The java.util.ArrayDeque.poll() method in Java is used to retrieve or fetch and remove the element present at the head of the Deque. The peek() method only retrieved the element at the head but the poll() also removes the element along with the retrieval. It returns NULL if the deque is empty. Synta 2 min read ArrayDeque pollFirst() Method in Java The java.util.ArrayDeque.pollFirst() method in Java is used to retrieve or fetch and remove the first element of the Deque. The peekFirst() method only retrieved the first element but the pollFirst() also removes the element along with the retrieval. It returns NULL if the deque is empty. Syntax: Ar 2 min read ArrayDeque pollLast() Method in Java The java.util.ArrayDeque.pollLast() method in Java is used to retrieve or fetch and remove the last element of the Deque. The peekLast() method only retrieved the element at the end but the pollLast() also removes the element along with the retrieval. It returns NULL if the deque is empty. Syntax: A 2 min read ArrayDeque pop() Method in Java The Java.util.ArrayDeque.pop() method in Java is used to pop an element from the deque. The element is popped from the top of the deque and is removed from the same. Syntax: Array_Deque.pop() Parameters: The method does not take any parameters. Return Value: This method returns the element present a 2 min read ArrayDeque push() Method in Java The Java.util.ArrayDeque.push(E element) method is used to push an element into the Deque. The operation is similar to the operation in the stack. The element gets pushed onto the top of the deque. Syntax: Array_Deque.push(E element) Parameters: The parameter element is of the type ArrayDeque and re 2 min read Like