Java ArrayDeque Class: remove() Method

public E remove()

The remove() method is used to retrieve and remove the head of the queue represented by a given deque.

This method differs from poll only in that it throws an exception if this deque is empty.

Package: java.util

Java Platform: Java SE 8

Syntax:

remove()

Return Value:

athe head of the queue represented by this deque

Return Value Type: E - the type of elements held in this collection

Throws:

NoSuchElementException - if this deque is empty

Pictorial Presentation

Example: Java ArrayDeque Class: remove() 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);        

      // 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);
      }

     // Using remove() remove element at the first(head) postion
      int re = deque.remove();
      System.out.println("Element removed is: " + re);


      // Print all the elements available in deque after pushing two elements using remove()
      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
Element removed is: 100
New deque:
Number = 200
Number = 150
Number = 95

public boolean remove(Object o)

Removes a single instance of the specified element from this deque.

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). Returns true if this deque contained the specified element (or equivalently, if this deque changed as a result of the call).

This method is equivalent to removeFirstOccurrence(Object).

Package: java.util

Java Platform: Java SE 8

Syntax:

remove(Object o)

Parameters:

Return Value:

true if this deque contained the specified element

Return Value Type: boolean

Example: Java ArrayDeque class: remove() Method

The following example fills a Java ArrayDeque class: remove() Method.

https://www.tutorialspoint.com/java/util/arraydeque_remove_object.htm
import java.util.ArrayDeque;
import java.util.Deque;

public class ArrayDequeDemo {
   public static void main(String[] args) {
      
      // create an empty array deque with an initial capacity
      Deque<Integer> deque = new ArrayDeque<Integer>(8);

      // use add() method to add elements in the deque
      deque.add(25);
      deque.add(30);
      deque.add(20);
      deque.add(40);        

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

      // deque contains element 30, returns true
      boolean retval = deque.remove(30); 
      if (retval == true) {
         System.out.println("element 30 is removed from the deque");
      } else {
         System.out.println("element 30 is not contained in the deque");
      }
         
      // deque does not contain element 15, returns false
      boolean returnval = deque.remove(15); 
      if (returnval == true) {
         System.out.println("element 15 is removed from the deque");
      } else {
         System.out.println("element 15 is not contained in the deque");  
      }

      // printing remaining elements
      for (Integer number : deque) {
         System.out.println("Number = " + number);
      }  
   }  
}

http://www.technicalkeeda.com/java-tutorials/java-arraydeque-remove-method-examples
import java.util.ArrayDeque;
 
public class App {
 
    public static void main(String[] args) {
 
        ArrayDeque < String > celebrities = new ArrayDeque < String > ();
 
        celebrities.add("Tom Cruise");
        celebrities.add("Will Smith");
        celebrities.add("Akshay Kumar");
        celebrities.add("Jackie Chan");
        celebrities.add("Will Smith");
 
        System.out.println("Removed element is :- " + celebrities.remove());
 
        System.out.println("Elements of deque after remove :- " + celebrities);
 
    }
 
}

Output:

Java Code Editor:

Previous:push Method
Next:removeFirst Method