Open In App
Related Articles

ArrayDeque addLast() Method in Java

Improve
Improve
Improve
Like Article
Like
Save Article
Save
Report issue
Report

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]


Last Updated : 20 Sep, 2022
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads