Master HashMap in 50 minutes | Hashmap internal working | Java interview questions and answers

Questions in this video are:
How does put() method of HashMap works in Java?
What is the requirement for an object to be used as key or value in HashMap?
What will happen if you try to store a key which is already present in HashMap?
Can you store a null key in Java HashMap?
Can you store a null value inside HashMap in Java?
How does HashMap handle collisions in Java?
Which data structure is used to implement HashMap in Java?
Can you store a duplicate key in HashMap?
Can you store the duplicate value in Java HashMap?
Is HashMap thread-safe in Java?
What will happen if you use HashMap in a multithreaded Java application?
What are the different ways to iterate over HashMap in Java?
Here are some of the ways to iterate over HashMap in Java:
by using keySet and iterator
by using entrySet and iterator
by using entrySet and enhanced for loop
by using keySet and get() method
What is the load factor in HashMap?
How does resizing happens in HashMap?
How many entries you can store in HashMap? What is the maximum limit?
What is the difference between the capacity and size of HashMap in Java?
What will happen if two different keys of HashMap return the same hashcode()?

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Thanks
Java Techies

[sameer.hameed]

I think it's good that when you explain any method/operation, specify it's time/space complexity.

[EagerExplorer]

Best in depth and crystal clear explanation ....it is very helpful.. thanks for uploading

[SatyaMaheshJagarapu]

Very nice presentation and explanation. THANKS

[buildleadinnovate]

Hii make video on microservice too :)
How transactions works in microservice?
How session works in microservice?
How two microservice communication with each other?
Thank you :)

[aasthasharma]

Loved the content!! Thanks for sharing

[ashishsingh-ysfx]

If we want to get all the key & value from one bucket in Hashmap, How can we get it

[rahimkhan-fhdd]

Once buckets gets full around 75% then HashMap internally increase bucket size based on load factor.
How existing data copied into new bucket like in case of ArrayList it will create new dynamic array and copy existing element into new one.
please clear my concern here.

[albeliever]

Mansi, you have given so many interviews and still not accepted any offer? Why? :)

[biswajitchanda]

When maintaining the self balancing BST, how node are being balanced while getting inserted, provided we have not written any comaparator for key class?

[KiranKumar-udzz]

Mam Wht happen if the hashcode value and key value are equal in read operation in the same bucket for two nodes next will it check for value or what

[ashokreddypapasani]

Does hash map allows empty string "" As key?