Java.util.ArrayDeque.size() Method

Description

The java.util.ArrayDeque.size() method returns the number of elements in this deque.

Declaration

Following is the declaration for java.util.ArrayDeque.size() method

public int size()

Parameters

• NA

Return Value

This method returns the number of elements in this deque.

Exception

• NA

Example

The following example shows the usage of java.util.ArrayDeque.size() method.

package com.tutorialspoint;

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

public class ArrayDequeDemo {
   public static void main(String[] args) {
      
      // create an empty array deque with an initial capacity
      Deque<Integer> deque = new ArrayDeque<Integer>(8);

      // use add() method to add elements in the deque
      deque.add(15);
      deque.add(20);
      deque.add(25);
      deque.add(22);

      // let us print all the elements available in deque
      for (Integer number : deque) {
         System.out.println("Number = " + number);
      }

      // this will print the size of this deque
      int retval = deque.size();
      System.out.println("Size of deque = " + retval); 
   }
}

Let us compile and run the above program, this will produce the following result:

Number = 15
Number = 20
Number = 25
Number = 22
Size of deque = 4