Push() Method : Java.util.ArrayDeque

Declaration :

public void push(E e)

1	public void push(E e)

Explanation :

Purpose	The java.util.ArrayDeque.push(E e) method pushes an element E onto the stack represented by this deque.
Parameters	e ===> The element to be pushed in the deque.
Return Value	This method does not return any value.
Exception	NullPointerException — if the specified element is null.

Java Program : Example

Below example will explain java.util.ArrayDeque.push() method.

package com.c4learn;
import java.util.ArrayDeque;
import java.util.Deque;
public class ArrayDequeDemo {
   public static void main(String[] args) {
      // Create empty array deque with an initial capacity
      Deque<Integer> deque = new ArrayDeque<Integer>(8);
      // Use add() method to add elements
      deque.add(100);
      deque.add(200);
      deque.add(300);
      deque.add(400);        
      deque.add(500);        
      System.out.println("Deque before : " + deque);
      // Insert elements using push
      deque.push(500);
      deque.push(600);
      deque.push(700);
      System.out.println("Deque after  : " + deque);
   }
}

package com.c4learn;

import java.util.ArrayDeque;

import java.util.Deque;

public class ArrayDequeDemo {

public static void main(String[] args) {

// Create empty array deque with an initial capacity

Deque<Integer> deque = new ArrayDeque<Integer>(8);

// Use add() method to add elements

deque.add(100);

deque.add(200);

deque.add(300);

deque.add(400);

deque.add(500);

System.out.println("Deque before : " + deque);

// Insert elements using push

deque.push(500);

deque.push(600);

deque.push(700);

System.out.println("Deque after : " + deque);

}

Output of Program :

Deque before : [100, 200, 300, 400, 500]
Deque after  : [700, 600, 500, 100, 200, 300, 400, 500]

1 2	Deque before : [100, 200, 300, 400, 500] Deque after : [700, 600, 500, 100, 200, 300, 400, 500]