ArrayDeque push() Method in Java

The Java.util.ArrayDeque.push(E element) method is used to push an element into the Deque. The operation is similar to the operation in the stack. The element gets pushed onto the top of the deque.

Syntax:

Array_Deque.push(E element)

Parameters: The parameter element is of the type ArrayDeque and refers to the element to be pushed into the deque.



Return Value: The method does not return any value.

Exceptions: The method throws NullPointerException if the passed parameter is NULL.

Below programs illustrate the Java.util.ArrayDeque.push() method:
Program 1: Adding String elements into the Deque.

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to illustrate push()
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 initial ArrayDeque
        System.out.println("Initial Deque: " + de_que);
  
        // Pushing elements into the deque
        de_que.push("Hello");
        de_que.push("World");
  
        // Displaying the final ArrayDeque
        System.out.println("Final Deque: " + de_que);
    }
}

chevron_right


Output:

Initial Deque: [Welcome, To, Geeks, 4, Geeks]
Final Deque: [World, Hello, Welcome, To, Geeks, 4, Geeks]

Program 2: Adding Integer elements into the Deque.

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java code to illustrate push()
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 initial ArrayDeque
        System.out.println("Initial Deque: " + de_que);
  
        // Pushing elements into the deque
        de_que.push(1254);
        de_que.push(4521);
  
        // Displaying the final ArrayDeque
        System.out.println("Final Deque: " + de_que);
    }
}

chevron_right


Output:

Initial Deque: [10, 15, 30, 20, 5]
Final Deque: [4521, 1254, 10, 15, 30, 20, 5]


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.