Java ArrayDeque Class: offerLast() Method

public boolean offerLast(E e)

The offerLast() method is used to insert the specified element at the end of a given deque.

Package: java.util

Java Platform: Java SE 8

Syntax:

offerLast(E e)

Parameters:

Return Value:

true (as specified by Deque.offerLast(E))

Return Value Type: boolean

Throws:

NullPointerException - if the specified element is null

Pictorial Presentation

Example: Java ArrayDeque Class: offerLast() Method

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

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

      // Use add() method to add elements in the deque
      deque.add(20);
      deque.add(30);
      deque.add(40);
      deque.add(35);        
      
      // Print all the elements of the original deque
      System.out.println("Elements of the original deque:");
      for (Integer n : deque) {
         System.out.println(n);
      }

      // Insert 50 at the end of the deque using offer() method.
      deque.offerLast(50);

      // Print all the elements available in deque
      System.out.println("Elements of the deque after insert an element at the last position of the deque:");
      for (Integer n : deque) {
         System.out.println(n);
      }
   }
}

Output:

Elements of the original deque:
20
30
40
35
Elements of the deque after insert an element at the last position of the deque:
20
30
40
35
50

Example of Throws: Java ArrayDeque class: offerLast() Method

NullPointerException - if the specified element is null

Let

in the above example.

Output:

Java Code Editor:

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