ArrayDeque addLast() Method in Java
Last Updated :
20 Sep, 2022
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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 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 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]
