Java collections framework interview questions and Answers | MOST ASKED | Core Java | Code Decode

This video contains tricky Java Collections Interview Questions and Answers for Freshers as well as for Experience Candidates. It also contains Internal Working of Hashmap

Collections Interview Questions part -2 :    • Most Asked Java Collection Framework ...  

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Collection Hierarchy 00:16
Map doesn’t extend the Collection Interface 13:13
Difference between fail-fast and fail-safe Iterators 14:51
java BlockingQueue 16:43
Difference between Synchronized Collection and Concurrent Collection with pictorial understanding 18: 10
Internal Working of hash map with pictorial explanation 20:13

In this video of java collections interview questions we have covered java collection framework interview questions or top collections interview questions starting with hierarchy of collection framework in java
collection hierarchy in java will demonstrate in depth knowledge of candidate.

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In java collections interview questions. java.util.Collection is the root
of the Java Collection framework and most of the collections in Java are inherited from this interface except Map Interface

java.util.List :
Contains ordered elements
May include duplicates
Supports the index-based search, random access but elements can be easily inserted irrespective of the position.

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

java.util.Set:
Doesn’t define an order for the elements hence index-based search is not supported
Doesn’t contain duplicates

java.util.Map
Represents a key, value pair
Map interface does not implement the Collection.
It can only contain a unique key
can have duplicate values

In java collections interview questions Similarly all these interfaces have implementing class and all those implementing classes have some 2 3 unique feature which differentiate them from the other collections. Please have a look at each of them in video as i have limited word limit here :)

The Java BlockingQueue interface, java.util.concurrent.BlockingQueue, represents a queue which is thread safe to put elements into, and take elements out of from. In other words, multiple threads can be inserting and taking elements concurrently from a Java BlockingQueue, without any concurrency issues arising.

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