What is a functional interface?
Java Backend Engineer Interview Questions
517 java backend engineer interview questions shared by candidates
What is the base class or first class that each class get extend?
How do you make code run very fast with very little memory?
What do you do if you need to rollback?
What types of operations can you do on streams? (intermediate and final operations - what is the diff?)
What are your strengths and weaknesses?
SQL DB cmds
Pattern Regex
I cannot share the interview questions, but I suggest remembering Java documentation classes/methods in some of the critical areas, like Java streams, Spring, JUnit, etc.
Asked to explain previous projects. Im depth questions about Redis
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