ArrayDeque size() Method in Java (original) (raw)

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 de_que = new ArrayDeque();

    // 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 de_que = new ArrayDeque();

    // 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