RemoveFirstOccurrence() Method : ArrayDeque in Java

Declaration :

public boolean removeFirstOccurrence(Object o)

1	public boolean removeFirstOccurrence(Object o)

Explanation :

Purpose	The java.util.ArrayDeque.removeFirstOccurrence(Object) method removes the first occurrence of the specified element in this deque.
Parameters	o ===> The element whose first occurrence is to be removed from this deque if present.
Return Value	This method returns true if the deque contains the specified element.
Exception	NA

Java Program : Example

Below example will explain java.util.ArrayDeque.removeFirstOccurrence(o) method.

package com.c4learn;
import java.util.ArrayDeque;
import java.util.Deque;
public class ArrayDequeDemo {
   public static void main(String[] args) {
      // Create empty array deque with an initial capacity
      Deque<Integer> deque = new ArrayDeque<Integer>(8);
      // Use add() method to add elements
      deque.add(100);
      deque.add(200);
      deque.add(100);
      deque.add(400);        
      deque.add(100);        
      System.out.println("Deque before : " + deque);
      // Remove elements using removeFirstOccurrence()
      deque.removeFirstOccurrence(100);
      System.out.println("Deque after  : " + deque);
   }
}

package com.c4learn;

import java.util.ArrayDeque;

import java.util.Deque;

public class ArrayDequeDemo {

public static void main(String[] args) {

// Create empty array deque with an initial capacity

Deque<Integer> deque = new ArrayDeque<Integer>(8);

// Use add() method to add elements

deque.add(100);

deque.add(200);

deque.add(100);

deque.add(400);

deque.add(100);

System.out.println("Deque before : " + deque);

// Remove elements using removeFirstOccurrence()

deque.removeFirstOccurrence(100);

System.out.println("Deque after : " + deque);

}

Output of Program :

Deque before : [100, 200, 100, 400, 100]
Deque after  : [200, 100, 400, 100]

1 2	Deque before : [100, 200, 100, 400, 100] Deque after : [200, 100, 400, 100]