How to calculate size of ArrayDeque in Java ?

Declaration :

public int size()

1	public int size()

Explanation :

Purpose	The java.util.ArrayDeque.size() method returns the number of elements in this deque.
Parameters	NA
Return Value	This method returns the number of elements in this deque.
Exception	NA

Java Program : Example

Below example will explain java.util.ArrayDeque.size() 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);
      // Get size of the Deque
      int size = deque.size();
      System.out.println("Size of Deque is : " + size);
   }
}

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);

// Get size of the Deque

int size = deque.size();

System.out.println("Size of Deque is : " + size);

}

Output of Program :

Deque before : [100, 200, 300, 400, 500]
Size of Deque is : 5

1 2	Deque before : [100, 200, 300, 400, 500] Size of Deque is : 5

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