Cognizant | Round 2 | Java Interview Questions with Answers | Microservices | Java8 | Spring Boot

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0:00 Introduction
0:59 What is Abstraction?
2:01 When to use Abstract Class and Interface?
2:34 Can we write implementation in Interface?
3:34 Can we declare variable in Interface?
4:31 What is immutable?
5:23 Create Immutable class with name , roll number as member variable
9:35 Use of final keyword with class
14:21 Employee class with Id and name. We have List of 10k employee. In that list some employees have same name and id. Return the unique employee object
19:24 What if we get same hashCode for two objects?
22:06 Hash table vs Concurrent hash map
22:59 Fail Fast vs Fail Safe iterator
33:27 What is actuators?
35:27 Query parameter vs Path Variable
37:35 What is Autowire annotation used for?