What is Queue in Collections framework ? Java Interview Questions and Answers | Code Decode

What is Queue in Collections framework ? Java Interview Questions and Answers | Code decode

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Course Description Video :

Java Queue interface orders the element in FIFO(First In First Out) manner. In FIFO, first element is removed first and last element is removed at last.

Deque Refers to double-ended queue
Elements can be added and removed from either end

way to apply resizable-array in addition to the implementation of the Deque interface
no capacity restrictions

Priority Queue is a queue with priority associated with each element.
high priority element is served before a low priority element irrespective of their insertion order

follows a FIFO approach
Elements adds at rear end and removes from the front end.

A Queue is designed in such a way so that the elements added to it are placed at the end of Queue and removed from the beginning of Queue. The concept here is similar to the queue we see in our daily life, for example, when a new iPhone launches we stand in a queue outside the apple store, whoever is added to the queue has to stand at the end of it and persons are served on the basis of FIFO (First In First Out), The one who gets the iPhone is removed from the beginning of the queue.

Queue interface in Java collections has two implementation: LinkedList and PriorityQueue, these two classes implements Queue interface.
Queue is an interface so we cannot instantiate it, rather we create instance of LinkedList or PriorityQueue and assign it to the Queue like this:

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[AllinOne-eton]

I am the first one who always eagerly waiting for the videos from code decode. ❤️

[GauravSharma-upgs]

First thing first,
I like your content very much so thankyou for sharing you rknowlegde with everyone.

Can you please make something on the FlatMap ?
Or a video on Streams all operations demo project ?

[tejasvinikalpande]

Very helpful video .
Can u plz upload video on webservice

[globalviralnewsupdate]

Thanks for this video. waiting for video of spring api gateway! :) one issue I was facing is I am not able to use eureka with webclient since resttemplate is going to be deprecated in future. right now I am using hard code url in webclient due to that issue.

[Catastrs]

Please create one video for completablefuture.