HCL Java realtime interview | Java 8 interview questions and answers, springboot microservices kafka

This video contains java interview questions, Microservices interview questions and answers, spring springboot interview questions.

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#java
#java8
#coreJava
#microservices
Kafka
sqlQueries
data structures
multithreading
algorithm
coding
springboot
architecture
mongodb
design principles

[vivekbhonsle]

1)what is immutability
2)How can we create our own Custom Immutable class
3)If the immutable class dont have setter methods then how can you set the
4)values for the instance fields
5)The getter method will return cloned object or the actual object

6)Life cycle of a Thread
7)What is the use of wait() and sleep()
8)Difference between wait() and sleep()
9)Use of join()
10)Use of yield()

11)what is ConcurrentHashMap
12)ConcurrentHashMap vs HashTable

13)What is Garbage Collection
14)If I create a Object where it will be created
15)Different parts of the Heap Memory

16)Which JDK version you are using
17)Features of Java 8
18)What is default methods in Java 8

19)What is Singleton class
20)How we can create our own Singleton Class
21)How can prevent a Singleton class from getting cloned-
we need to implement/override the clone() method and throw an exception
CloneNotSupportedException from the clone method
22)How can we break the singleton pattern
23)Serialization and Deserialization issues with Singleton
24)what design patterns you have worked on?
25)What is factory design pattern- Spring Bean Factory
is example of Factory Design Pattern

26)Default scope of Bean
27)Different types of Bean Scopes
28)What is Dependency Injection
29)Types of Depedency Injection- Constructor and Setter Injection

30)How polymorphism works in Spring- explain @Qualifier

31)Have you worked on Spring Security? How it works

32)Advantages of Microservice over Monolith
33)How do you scale the Application using Kubernetes
34)How will you run the Docker image and deploy..tell the commands
35)Can we achieve auto scaling using Docker or is there any limitation

36)Can you tell the services in your microservices application
and how do they interact with each other

37)What is Pub/Sub in Kafka
38)How many subscribers can subscribe to the Topic
37What is the role of Broker in Kafka
38)Diff between Power Mock and Mockito

39)Methods supported by Stream- filter(), map(), flatMap()
40)How can you find the second largest number in a list of integers
41)Avg salary of each department using stream
42)How can you convert the list into Map
43)Method references in Java 8
44)JPA specification executor- u can use criteria

45)What is executor in context of Threads
46)How can you remove the duplicate elements from the array without using
any built in classes or methods

47)How do you reverse a singly linked list
48)what is doubly linked list, circular linked list

49)2nd highest salary using sql

50)git commands, rebase

[thesquirrels]

We have a tree which gives a pure mango healthy.
But software industry changed changed this concept..
Now the Mango tree is same and they are demanding different fruit to the tree..
Now they need, Banana, Apple, grapes, watermelon, some time they want chees piza also..
So that Tree is and Employee or engineer who is trying to dilever all frouts

[spiritualyogiyogi]

@1. Intro ..
@2. Java: Immutable ? User Defined Immutable Class?
@3 Shallow Cloning .
@4 Hierarchy of Thread
@5. Use of wait() .... Notify...
@6. Sleep ? Use of Join().. How do you control the Thread ?
@7. What is .... & . ConcurrentHashMap.
@8. ConcurrentHashMap vs HashTable
@9. G.C ? Where it is stored ?, , , ,
@10 .New Features of Java.8. Default Method ?
@11 Singleton Class ?
@12. What all things you take care to IMPL Singleton..
@14. How do you avoid Clone ? Ans. overide .... Is there any other way to break it ?
@15 . Serialization and Deserialization - There is Issue Right ? We have to maintain single Object
@16 . Design Patterns ? Factory DP ? Loose Couple Purpose
@17..
@18. DI.
@19. Types of DI ?
@19. ?
@20. interfaces
@21

[rexsam]

Mansi developers don't have to know everything as there are other groups like Devops and Integration teams who are hired to do their job. If you are not comfortable with that skill just don't mention that or even try to attempt answering those which are not in your comfort zone. The JD that is given to you before interview should be referred. However once you get a chance you can upgrade yourself. Eg Kubernetes, AWS, Docker, Nginx, Istio etc

[ArvindSharma-uxbp]

This was the toughest interview i had ever seen. I almost died after listening to the interview questions, thank god to doctors who recovered me.

[subhamraoniar]

I also once had multiple rounds of interviews with HCL and it was very lengthy, this interview was not too easy but not too tough as well. Some of the questions were specifically to your project related technology like kafka but overall your interview was good 👍

[jaffarbashir]

Thanks for sharing such video. Helps a lot in understanding

[shashikantkumar]

Its look like 8 years of Experience interview going on, definitely it's not for 5 years and that too in HCL

[Ravikumar-gjqw]

Do more latest videos, Thanks u so much

[RealSlimShady-umgf]

Listening. No questions on how you configured Kafka on Production? How many Partitions were configured? How many messages processed per sec? How many Kafka topics used? Without screen share it's difficult to understand what you are writing

[Pro_Gamer]

maine full stack java developer ka course kiya hai kya mujhe full stack java developer ke jagah core java developer ki job milegi kya???

[funomai]

Basically basically actually actually … uff😫😫

[durga.prasad]

This was the real-time interview that you had recorded?

[d-k-]

lol all this in the interview and the day to day task are literally if else and loops. maybe lists and maps.

[surajhk]

Girl knows so much theory but can't reverse a linked list.

[saiyamk]

typical desi interviewer in USA for service based company.

[nitiKT]

One day, I will marry this girl.. before people get enraged.. I only mean it as a compliment.. 😀

[kanekaab]

'basically' was really irritatng

[achintyamukherjee]

Typical service based interview. Same core Java questions are being asked from last 15 years.