The Java.util.ArrayDeque.isEmpty() method in Java is used to check and verify if an ArrayDeque is empty or not. It returns True if the Deque is empty else it returns False.
Syntax:
Array_Deque.isEmpty()
Parameters: The method does not take any parameter.
Return Value: The function returns True if the deque is empty else it returns False.
Below programs illustrate the Java.util.ArrayDeque.isEmpty() method:
Program 1:
// Java code to illustrate isEmpty()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);          // Verifying if the Deque is empty or not        System.out.println("The Deque is empty? " +                                     de_que.isEmpty());          // Clearing the deque        de_que.clear();          // Verifying if the Deque is empty or not        System.out.println("The Deque is empty? " +                                     de_que.isEmpty());    }} |
Output:
ArrayDeque: [Welcome, To, Geeks, 4, Geeks] The Deque is empty? false The Deque is empty? true
Program 2:
// Java code to illustrate isEmpty()import java.util.*;  public class ArrayDequeDemo {    public static void main(String args[])    {        // Creating an empty ArrayDeque        Deque<Integer> de_que = new ArrayDeque<Integer>();          // Displaying the ArrayDeque        System.out.println("ArrayDeque: " + de_que);          // Verifying if the Deque is empty or not        System.out.println("The Deque is empty? " +                                    de_que.isEmpty());    }} |
Output:
ArrayDeque: [] The Deque is empty? true
