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 
// 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 
// 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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