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
