Interview Model

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: How HashMap works.  What is the difference between ConcurrentHashMap and Flat map? Implement the singleton and factory patterns Write a JUnit test class to test any service Aggregation and projection queries in mongodb Rest of the questions were from my project. Interviewer was also asking the configuration part in written. Please comment your answers for above questions 😆

Overview: Iris Software provides cab as well as lunch for interviewee. It's take first written then two technical rounds after then a client round. Interview Questions: What's your role in your current project.  Which java version you are using in your project and what are the new feature in that. Why Exception class is checked exception but it's child Runtime is unchecked exception. What is the use of SerialVersionUID in serialization. Can we also change the properties after serialize any object. There are two methods void some(Object obj) and void some(String str) if I will some(null) which one will call. What is the difference between notify() and wait() methods. What are all way to create thread in java and also describe Executors.newCachedThreadPool() Would given code compile successfully or what ?                                               ...