Java ArrayDeque Class: size() Method

public int size()

The size() method is used to count the number of elements in a given deque.

Package: java.util

Java Platform: Java SE 8

Syntax:

size()

Return Value:

the number of elements in this deque

Return Value Type: int

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Example: Java ArrayDeque Class: size() 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);  
      deque.add(200); 

      // 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);
      }

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

Output:

Elements of the original deque:
Number = 100
Number = 200
Number = 150
Number = 95
Number = 200
Size of deque = 5

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