Round 1(Technical Round)

These are the questions that were asked in the first round:

How is java Platform Independent(drilled down to basics) -> JVM, JRE
Rate yourself in java.
What is a classLoader? How is it used while running the program in Java?
ClassNotFound Exception vs NoClassDefFound exception difference
Why classNotFound Exception found at runtime only?
String Pool - where it is present?
What is intern() function?
String Literals difference in == and equals
String objects difference in == and equals
Differences in Microservice and Monolithic services
Some questions from my Resume, the project that I am working on.
Swap x and y without using a temp variable
Write all permutations of 3 character word

Even though the recruiter said it would be a DSA round, most of the questions were core Java questions. I was not able to answer all of them at the time, so I was not hopeful that the second round would be scheduled at all. However, I received a call a few days later saying that my second round would be scheduled for the following week.

Round 2(Technical Round)

These were the questions asked in this round:

Do you know what is Builder Pattern? Write code for Builder Pattern.
Write code for Singleton pattern.
Print the main diagonal of the matrix. Note: Always use 1 loop and print arr[i][i]
Write a code to work with 5 thread printing data one by one.
Abstract class vs interface
What is Encapsulation?
What is AutoBoxing?
Serialzable vs exteranlizable? what they are, how are they different?
Static vs instance variable
What is Synchronization? How can be achieve synchronization in Java Programs?
Some other java questions

This round mainly focused on having me implement some problems, followed by some core Java questions. This round wenr very well and I almost answered all the questions in this round.

Verdict

Not selected. Not sure what went wrong in the second interview.

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