What is the Deque.isEmpty() method in Java?
In this shot, we will discuss how to use the Deque.isEmpty() method in Java.
The Deque.isEmpty() method is present in the Deque interface inside the java.util package.
Deque.isEmpty() is used to check whether the deque is empty or not.
Syntax
boolean isEmpty()
Parameters
The Deque.isEmpty() method doesn’t take any parameters.
Return value
The Deque.isEmpty() method returns a boolean value:
True: When the deque is empty.False: When the deque is not empty.
Code
Let us look at the code snippet below.
import java.util.*;class Main{public static void main(String[] args){// Create the integer listDeque<Integer> d = new LinkedList<Integer>();// add elements in the listd.add(2);d.add(28);d.add(6);d.add(80);d.add(21);d.add(7);d.add(15);// check list isempty or notif(d.isEmpty())System.out.println("Deque is empty.");elseSystem.out.println("Deque is not empty.");}}
Explanation
- In line 1, we import the required package.
- In line 2, we make a
Mainclass. - In line 4, we make a
mainfunction. - In line 6, we declare a deque that consists of
Integertype elements. - From lines 8 to 14, we use the
Deque.add()method to insert the elements in the deque. - In lines 16 to 19, we check whether the deque is empty or not and display the message accordingly.
In this way, we can use the Deque.isEmpty() method in Java.
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