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Showing content from https://www.geeksforgeeks.org/java/arraydeque-size-method-in-java/ below:

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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