ArrayDeque size() Method in Java

Last Updated : 10 Dec, 2018

The Java.util.ArrayDeque.size() method in Java is used to get the size of the Deque or the number of elements present in the Deque.

Syntax:

Array_Deque.size()

Parameters: The method does not take any parameter.

Return Value: The method returns the size or the number of elements present in the Deque.

Below programs illustrate the Java.util.ArrayDeque.size() method:
Program 1: Adding String elements into the Deque.

   // Java code to illustrate size() 
import java.util.*; 
  
public class ArrayDequeDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty ArrayDeque 
        Deque<String> de_que = new ArrayDeque<String>(); 
  
        // Use add() method to add elements into the Deque 
        de_que.add("Welcome"); 
        de_que.add("To"); 
        de_que.add("Geeks"); 
        de_que.add("4"); 
        de_que.add("Geeks"); 
  
        // Displaying the ArrayDeque 
        System.out.println("ArrayDeque: " + de_que); 
  
        // Displaying the size of Deque 
        System.out.println("The size is: " + de_que.size()); 
    } 
} 
 
  

Output:

  ArrayDeque: [Welcome, To, Geeks, 4, Geeks]  The size is: 5

Program 2: Adding Integer elements into the Deque.

   // Java code to illustrate clear() 
import java.util.*; 
  
public class ArrayDequeDemo { 
    public static void main(String args[]) 
    { 
        // Creating an empty ArrayDeque 
        Deque<Integer> de_que = new ArrayDeque<Integer>(); 
  
        // Use add() method to add elements into the Deque 
        de_que.add(10); 
        de_que.add(15); 
        de_que.add(30); 
  
        // Displaying the ArrayDeque 
        System.out.println("ArrayDeque: " + de_que); 
  
        // Displaying the size of Deque 
        System.out.println("The size is: " + de_que.size()); 
    } 
} 
 
  

Output:

  ArrayDeque: [10, 15, 30]  The size is: 3

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