Interview Questions for Senior Java Developer at RSystem, Noida

Overview:

RSystem takes first technical round, if you clear this round then second round will be only for formality, if you will be selected then you have to clear the client interview before assign the project.

Interview Questions:

  1. How HashMap works. 
  2. What is the difference between ConcurrentHashMap and Flat map?
  3. Implement the singleton and factory patterns
  4. Write a JUnit test class to test any service
  5. Aggregation and projection queries in mongodb
  6. Rest of the questions were from my project. Interviewer was also asking the configuration part in written.

Please comment your answers for above questions 😆

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