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What is the ConcurrentLinkedDeque.isEmpty() method in Java?

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The ConcurrentLinkedDeque is a thread-safe unbounded deque. The null value is not permitted as an element. We can use the ConcurrentLinkedDeque when multiple threads are sharing a single Deque.

The isEmpty method can be used to check if the ConcurrentLinkedDeque object has no elements.

Syntax

public boolean isEmpty()

Parameters

This method does not take any arguments.

Return value

This method returns true if the deque object has no elements. Otherwise, it returns false.

Code

The code below demonstrates how to use the isEmpty method.

import java.util.concurrent.ConcurrentLinkedDeque;
class IsEmpty{
public static void main( String args[] ) {
ConcurrentLinkedDeque<String> deque = new ConcurrentLinkedDeque<>();
System.out.println("the deque is : " + deque);
System.out.println("Check if the deque is empty : " + deque.isEmpty());
deque.add("1");
System.out.println("\nthe deque is : " + deque);
System.out.println("Check if the deque is empty : " + deque.isEmpty());
}
}

Explanation

In the code above:

  • In line 1, we imported the ConcurrentLinkedDeque class.

  • In line 4, we created a ConcurrentLinkedDeque object with the name deque. This object doesn’t have any elements in it.

  • In line 6, we called the isEmpty method on the deque object. This method will return true because the deque object is empty.

  • In line 8, we used the add() method of the deque object to add one element ("1") to deque.

  • In line 10, we called the isEmpty method on the deque object. This method will return false because the deque object contains one element.

RELATED TAGS

isempty
java
communitycreator

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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