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()importjava.util.*;publicclassArrayDequeDemo{publicstaticvoidmain(Stringargs[]){// Creating an empty ArrayDequeDeque<String>de_que=newArrayDeque<String>();// Use add() method to add elements into the Dequede_que.add("Welcome");de_que.add("To");de_que.add("Geeks");de_que.add("4");de_que.add("Geeks");// Displaying the ArrayDequeSystem.out.println("ArrayDeque: "+de_que);// Displaying the size of DequeSystem.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()importjava.util.*;publicclassArrayDequeDemo{publicstaticvoidmain(Stringargs[]){// Creating an empty ArrayDequeDeque<Integer>de_que=newArrayDeque<Integer>();// Use add() method to add elements into the Dequede_que.add(10);de_que.add(15);de_que.add(30);// Displaying the ArrayDequeSystem.out.println("ArrayDeque: "+de_que);// Displaying the size of DequeSystem.out.println("The size is: "+de_que.size());}}