Java Spring Boot 4 Years Experience Interview [With Coding Problems]

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[jayjoshi]

Really great questions and liked the way the important keywords are focused and asked their real time use cases.
15:38 Final keyword real time usage and does it improve the performance of the application or degrades it ?
Ans -> Use of final keyword is for compile time optimization - the compiler can optimize the code more effectively when it knows that a variable or method cannot be changed
16:20 Can you tell me about Polymorphism ? Can you tell me a scenario where Polymorphism solved the architecture level problem?
Ans -> Polymorphism allows an architect to define an interface to behavior that is independent to how the behavior is implemented (Reporting System).
17:44 Can you explain HashMap and Hashset ? Internal working of HashMap and HashSet
21:06 Which Java version do you use currently? What new features are available in Java 8 now?
21:52 Why Java Stream APIs were introduced ?
23:42 Can you tell in brief about Hashcode and equals method?
25:12 Why don't we use primitive data types in Collection framework ?
Ans -> Collections requires objects for manipulation and primitives are not derived from object
26:08 How do you secure the REST APIs in your application?
28:15 What algorithms are used in Arrays.sort() and Collections.sort() ?
Ans -> Arrays.sort() used Dual Pivot Quick sort algo for primitive datatypes and Tim sort algo for Object types. Where as Collections.sort() used only Tim Sort ()Hybrid of Merge + Insertion Sort) algorithm internally.
29:21 Do you know about Webflux and mono in java application ?
29:51 Difference b/w Controller and RestController annotations?
31:05 What are the best practices while writing REST APIs?
33:06 Difference between Component, Service and Repository annotations?
35:48 Can you explain Spring Bean Lifecycle?
36:15 What are the uses of Response Entity?
37:00 What should be the Delete API method status code?
Ans -> If Delete API is returning some response then status code should be 200, if no content is returned then 204 status code are considered good practice.
38:33 Have you handled anything related to Timeout error if API times out? What can you use in this case?
40:14 How does basic Authentication work in REST APIs?
41:07 How would you configure CORS policy in Spring Boot Application to accept Cross Origin request from front end?
42:20 How would you secure sensitive data in Spring Boot Application that is accessed by multiple users with different roles?
43:50 Are you familiar with any specific tools or practices for monitoring logs?
45:04 How do you manage dependencies in Maven project?
45:42 How would you revert changes in Git if you accidentally pushed a bug to the main branch?
Ans-> git revert command can be used for that.
47:20 What is the purpose of Unit testing in Software Development Life Cycle?
48:19 Coding Problems

[Parithabangal_core_fan]

Sir one doubt about the interview as in interview they will ask mostly concept wise questions or problem solving questions please let me know
Thank you