LinkedBlockingDeque peekFirst() method in Java
The peekFirst() method of LinkedBlockingDeque returns the front element in the Deque container, but does not deletes it. It returns null if the container is empty.
public E peekFirst()
Parameters: This method does not accept any parameters.
Returns: This method returns front element in the Deque container if the container is not empty. It returns null if the container is empty.
Below programs illustrate peekFirst() method of LinkedBlockingDeque:
Linked Blocking Deque: [74381793, 5278367, 35658786, 7855642] Front element in Deque: 74381793
Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793] Front element in Deque: null
Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more, please refer Complete Interview Preparation Course.