Java ArrayDeque Class: removeFirstOccurrence() Method

public boolean removeFirstOccurrence(Object o)

The removeFirstOccurrence() method is used to remove the first occurrence of an specified element in a given deque (when traversing the deque from head to tail). If the deque does not contain the element, it is unchanged. More formally, removes the first element e such that o.equals(e) (if such an element exists).

Package: java.util

Java Platform: Java SE 8

Syntax:

removeFirstOccurrence(Object o)

Parameters:

Return Value:

true if the deque contained the specified element

Return Value Type: boolean

Pictorial Presentation

Example: Java ArrayDeque Class: removeFirstOccurrence() Method

import java.util.ArrayDeque;
import java.util.Deque;

public class Main {
   public static void main(String[] args) {
      
      // Create an array deque 
      Deque<Integer> deque = new ArrayDeque<Integer>(8);

      // Use add() method to add elements in the deque
      deque.add(100);
      deque.add(200);
      deque.add(150);
      deque.add(95);  
      deque.add(200); 

      // Print all the elements of the original deque
      System.out.println("Elements of the original deque:");
      for (Integer number : deque) {
         System.out.println("Number = " + number);
      }

     // removeFirstOccurrence() will remove first occurrence of element 200
      deque.removeFirstOccurrence(200);


      // Print all the elements available in deque
      System.out.println("New deque:");
      for (Integer number : deque) {
         System.out.println("Number = " + number);
      }
   }
}

Output:

Elements of the original deque:
Number = 100
Number = 200
Number = 150
Number = 95
Number = 200
New deque:
Number = 100
Number = 150
Number = 95
Number = 200

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