Core Java Interview Preparation  Welcome Friends to the Bright Tech Bits, in this post I am trying to cover the most asked interview questions for Java, Spring Boot, and Microservices. These questions are helpful for freshers as well as experienced ones. What is Method Hiding - static method overriding  in subclass  String constant pool List the different collections you are aware of. What is fail-safe and fail fast iterators Questions on Hashmap internal working  Difference between comparable and comparator interface. Difference between Array and ArrayList  Difference between HashMap and ConcurrentHashMap What is serialization and externalization, use of transient keyword Checked/Unchecked Exceptions How to create our own custom checked execption What is need of serialization. What is diff between wait and notify method in multithreading. Design Patterns - Creational , structural, Behavioral  Singletone Design pattern implementations  ...