Java ArrayDeque Class: push() Method

public void push(E e)

The push() method is used to push an element onto the stack represented by a given deque.

This method is equivalent to addFirst(E).

Package: java.util

Java Platform: Java SE 8

Syntax:

push(E e)

Parameters:

Return Value Type: E

Throws:

NullPointerException - if the specified element is null

Pictorial Presentation

Example: Java ArrayDeque Class: push() Method

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

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

      // Use add() method to add elements in the deque
      deque.add(100);
      deque.add(200);
      deque.add(150);
      deque.add(95);        

      // Print all the elements of the original deque
      System.out.println("Elements of the original deque:");
      for (Integer number : deque) {
         System.out.println("Number = " + number);
      }

     // Add two elements using push() method
      deque.push(1000);
      deque.push(1500);

      // Print all the elements available in deque after pushing two elements using push()
      System.out.println("New deque:");
      for (Integer number : deque) {
         System.out.println("Number = " + number);
      }
   }
}

Output:

Elements of the original deque:
Number = 100
Number = 200
Number = 150
Number = 95
New deque:
Number = 1500
Number = 1000
Number = 100
Number = 200
Number = 150
Number = 95

Java Code Editor:

Previous:pop Method
Next:remove Method