ArrayDeque addLast() Method in Java

Last Updated : 20 Sep, 2022

The java.util.ArrayDeque.addLast(Object element) method in Java is used to insert a specific element at the end of this deque. It is similar to the add() method in Java. Syntax:

Array_Deque.addLast(Object element)

Parameters: The parameter element is of the type ArrayDeque and refers to the element to be added. Return Value: The function does not return any value. Exceptions: The method throws NullPointerException if the passed parameter is NULL.

The Time Complexity of this addLast(Object element) is O(1) i.e Constant.

Below programs illustrate the Java.util.ArrayDeque.addLast() method:

Program 1: Adding Integers to the Deque.

Java

// Java code to illustrate addLast() 
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(15); 
        de_que.add(30); 
        de_que.add(20); 
        de_que.add(5); 
  
        // Displaying the ArrayDeque 
        System.out.println("ArrayDeque: " + de_que); 
  
        // Adding elements at the end 
        de_que.addLast(40); 
        de_que.addLast(50); 
        de_que.addLast(60); 
        de_que.addLast(70); 
  
        // Displaying the ArrayDeque 
        System.out.println("ArrayDeque_end_addition: " + de_que); 
    } 
}

Output:

ArrayDeque: [10, 15, 30, 20, 5]
ArrayDeque_end_addition: [10, 15, 30, 20, 5, 40, 50, 60, 70]

Program 2: Adding String to the Deque.

Java

// Java code to illustrate addLast() 
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("4"); 
        de_que.add("Geeks"); 
  
        // Displaying the ArrayDeque 
        System.out.println("ArrayDeque: " + de_que); 
  
        // Adding elements at end 
        de_que.addLast("GFG"); 
        de_que.addLast("World"); 
        de_que.addLast("Hello"); 
  
        // Displaying the ArrayDeque 
        System.out.println("ArrayDeque_end_addition: " + de_que); 
    } 
}

Output:

ArrayDeque: [Welcome, To, Geeks, 4, Geeks]
ArrayDeque_end_addition: [Welcome, To, Geeks, 4, Geeks, GFG, World, Hello]

ArrayDeque clear() Method in Java

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