200+ Java Fullstack developer questions

Featured ~ Subbareddy Nallamachu ~ Leave a comment

Write Fibonacci series programming and explain logic
how auto wiring works in spring
write a program for dependency injection
how security is implemented in your project.
difference between filter and map in java streams.
Explain about your current project.
How to read the file and display total count of each word.
How angular Makes calls to spring boot
What is spring profile
There is a list with emp objects with duplicate name, age attributes. How to retrieve uniques names.
What Technologies used in last project.
Abstract class and encapsulation.
What is HashMap? how it works.
what is inter thread communication
what ArrayList ? extends object and ArrayList? super object means
what is splice and slice
difference between == and ===
Write a Java 8 program to get the sum of all numbers present in a list?
what FlatMap?
write a prog ..how to sort emp obj in java8
Given the list of employees, find the employee with name “R”.
Angular Routing process
Difference Between constructor vs ngOnInit in Angular
how to find which datatype is created in JavaScript
what is id in CSS
how to create a singleton object
what is static method, static block and static class
what will happen if we add final to a method
what is @path and path param, path variable
what is multi catch block
what is subquery and when we use it
how to use service in angular
difference between @Input and @Output in angular
what is event emitter
what is @beanpropertyrowmapper
Handle cross horizon resource sharing-angular, how can u candle hash code, equal
sql query, highest salary- department wise
Routing in Angular
import and export in ngModule
what is ngModule
directives and use of them in angular
routes in angular
what is children attribute in routes in angular
Hibernate OneToMany and ManyToOneMapping example
How to return a single user if userId passed or list of users if userId not passed in JPA
Micro services communication
Autorization and authentication process in current project
String reverse program
Spring JPA Example
Factory design pattern
Singleton Design pattern and real time usage and implementation
How to prevent singleton object from clone?
Synchronous and asynchronous requests, how to consume angular http request and services
Springcloud config
publishing a service in spring cloud
diff b\w rest and soap
what is the new in the current java version compared with previous versions?
What is the lambda expression?
What is a functional interface and it’s example?
How many ways to create a thread and it’s life cycle?
What are streams in java?
What is the difference between a hashset and concurrenthashset?
Difference between hashmap and concurrenthashmap
What is LinkedHashMap
What is a static method in java?
How the static class locking works?
what is a singleton design pattern and how do you create it?
What are directives in angular?
What are pipes in angular?
How do components communicate with each other and data transfer among them?
What is DDL and DML??
What is the difference between Truncate and Delete?
What is the difference between function and procedure?
What is immutable class
Method to find missing number in a Array list with value from 0-100. (number 7 and are missing)
find the number of integer appear in a array list having duplicates
Explain Quick sort
Serialization
what is executer framework and cachethreadpool
How hashMap works internally
Spring & Microservice
What is microservice and its architecture
How to handle situation if one of microservice fails
What is API gateway
What is client side load balancing
Spring life cycle
What is dependency Injection
Annotation used in circuit breaker implementation
Microservice design patterns
fast iterate and safe iterate
How you read file from angular
difference between get and load in hibernate
Spring JPA CRUD Repository
jdbcTemplate methods
difference between Observer and subscribe in angular
Spring boot and hibernate integration steps
How you read properties file from springboot
sql query for one to many mapping.
Functional interface.
Design patterns used Realtime in your application.
Java Multithreading – wait & notify, Obtaining lock.
Static and Dynamic Overloading.
Spring security its annotations.
Java 1.8 features.
Angular Observable subscribe and unsubscribe.
what happens when we call a void method in a system.out.println()?
What is Resource(Request) and Response in Restful services?
how can I return custom data instead of JSON or XML content for a Rest response?
what are stream(s) in java and few operations on them like comparison
difference between comparable and comparator
why Clonable is not implemented by Collection interface, reason?
Components in angular
What is the life cycle of components in angular
Sharing data between components in Angular
Type Script compilation process
Angular life cycle
what are gate in angular
in how many ways I can sort my employee object with the given set of columns, explain?
How to create schedulers in java
How we implement batch import and export functionality in spring.
How to maintain session in server side.
Lifecycle process of angular
How to reload header and footer menu based on particular left menu routing
Box model in CSS
Pseudo selector in CSS
Difference between display block & display inline-block
Difference between position absolute and position relative
What is the internal implementation of HashMap?
What is the algorithm/datastructure used to get an emlement from HashMap?
How to make HashMap synchronized
Difference between HashMap & concurrent hash map
Authenticate client side in angular
Time difference calculation in angular
How to create Generic class in angular
Difference between Post and PUT
Stored Procedures
Monolithic architecture and Microservice Architecture
java 8 new features
List of collections used
How exceptions are handled
Throw and Throws
Final, Finally, Finalize
Spring IOC
Spring boot advantages
JPA repository
First level second level cache in hibernate
Union vs Union all
Spring security
Spring transactions
Custom directives
Get and post in angular
employee has id, name, salary. Find the list of employees where the employee name starts with “n” using java8?
can you the same in ArrayList and array?
Vulnerability checking process in the front end
Have you worked on Cross Site Scripting?
What are the challenged faced in Cross Site Scripting?
Have you worked in Custom annotation creation in Java?
if yes? Could you explain the implementation of custom annotation?
Where thread class variables will get store in Memory?
What are the different databases you worked?
Did you face any query performance issues? how did you increase the performance of the query?
What is index and query of it?
What is the data structure used to create an index?
How can you handle the errors in Spring Boot?
Can you explain what are the dependencies required to create REST application in Spring Boot? what other classes needs to be created to perform CURD operations and it’s flow?
How you worked on application security?
angular life cycle hooks
Explain insertion sort logic
Write query to get 3rd highest salary of employee
How to get the average value of integers using streams
What are method references
What are for lambda expressions introduced and what is the advantage
explain proxy pattern
how to find duplicate user object user {name, age}
What is observable
What is cluster index
What is the deployment procedure of Micro services
Explain service discovery pattern
What is containerization
how to import module and service in Angular
Difference between monolithic and microservices architecture.
Difference between Spring and Spring boot
Explain about Spring boot starter
Spring security
@Springboot application
Gates in angular
Life cycle of angular hooks
How to pass the data between components.
Structural and behavioral directives
Multi threading concepts
Architecture of the current project where you are working
Architecture of angular application
Difference between soap and Rest
Questions on GIT code checkout process
Questions on Front end security concepts
Code deployment procedure
Load balancing concepts related to services
REST and SOAP justification for usage
Questions based on resume and projects explanation Why ? What ?
How we used if we mention any technology

Wells Fargo Java Interview Questions

November 15, 2018November 2, 2019 ~ Subbareddy Nallamachu ~ Leave a comment

As part of job search I have attended interview in couple of companies Wells Fargo is one among them. Here I am placing the list of interview questions which I have faced in a conference round of interview. I hope this will definitely help someone who is attending on below mentioned skill set.

Java

Microservices

Spring Boot

Spring Cloud

Pivotal Cloud Foundry(PCF)

Questions:

Could you please explain about your techstack and previous project?

Let’s start with Core Java:

What is the output of below program?

class A{
   private void method1(){
      System.out.println("Inside A method");
   }
}
class B extends A{
   public void method1(){
      System.out.println("Inside B method");
   }
}
public class Test{
   public static void main(String[] args){
       A a = new B();
       a.method1();
   }
}

Is above program violating the rules of Overriding or not?
When do you go for Interface and abstract class?
From Java 8 on wards, we are able to implement methods in interface. Then what is the need of Abstract Class?
What all java 8 concepts you aware?
What is functional interface and how it is different from normal interface?
Have you worked on multithreading?
How can you communicate from one thread to another?
How thread pool works?
What all the classes and interfaces you worked in Collection framework?
How HashMap works internally?
In Java 7, there are few changes came in HashMap. Do you know what are those?
If I have two keys(Key1=1, Key2=10) with same hashcode, What will happen when we try to put int HashMap?
How TreeSet can store elements in order?
I have custom objects of Student. What should I do to store them in ascending order in TreeMap? TreeMap will take care internally or do I need to write logic for sorting?
When we use Comparable and Comparator?

Coming to WebServices, Spring, Spring Boot, Spring Cloud and Microservices:

Have you worked on REST(REpresentational State Transfer) WS?
How can you convert the JSON data into Java Object?
How can you consume the endpoint from UI?
What are different modules you worked in Spring framework?
Can you explain me the steps how MVC works in Spring and Spring Boot?
What are the advantages of using @RestController over @Controller?
In normal Spring MVC, which you prefer to use either @RestController or @Controller? Why?
What are the advantages of using Spring Boot?
Do you know, how configuration will take care automatically in Spring Boot? Or Do you know, how autoconfiguration works in Spring Boot?
When we declare web module in pom.xml, it download all the related dependencies(JAR’s). How it will identify, which jar is for which module?
How can we run Spring Boot application?
Which is the default server uses in Spring Boot? Does it require any configurations to add?
If server is down, instead of showing default error message, we need to show Custom message. How will you do?
Have you worked on feignClient?
What are different tools you worked on Spring Cloud?
Have you used inline DB?
Do we need to provide any configuration details to use inline DB?
Have you worked on WebLogic?

Coming into PCF:

What is Diego? what it will do?
Can you explain about 12 factor apps?
While pushing application into pivotal, which way you followed? direct or with manifest?
We have different environments with different configurations like Development, Staging and Prod. How will you build and push application into different environments?
I have a monolithic application, how can you push that into pivotal?
My application data source configuration properties are placed in WebLogic server. How will you take care of those while pushing application into pivotal?
Have you used any of User provided services?

Thanks for visiting. If anyone else has extra questions which you people faced, please write in comment.

Codility Division Sequence Challenges in Java

October 10, 2018November 2, 2019 ~ Subbareddy Nallamachu ~ Leave a comment

This is one of the challenge I have completed in online coding test taking in Codility in Java.

Problem:

The actual problem given to me is, input N is given as random number, I need to find out each number is divisible with 2, 3 and 5. If input N is divisible by 2, 3 and 5, I need to print output as TWO, THREE and FIVE accordingly. If N is divisible by 2 and 3, then need to print output as TWOTHREE. The same will be applicable for others.

If the number is not divisible with any of 2, 3 and 5 then I need to print the number as it is in the output. The sample output would be look like,

Output:

1

TWO

THREE

TWO

FIVE

TWOTHREE

7

Solution:

Here I have placed the source code which will be compatible with Java technology and which meets to all conditions mentioned in above problem. As per my knowledge I have written this code. If anyone can solve in a better way, please share your source code in a comment.

public class DivisionSequence {
 static int input = 24;

 public static void main(String[] args) {
  for (int i = 1; i <= input; i++) {
   if (i % 2 == 0) {
    System.out.print("TWO");
    if (i % 3 == 0) {
     System.out.print("THREE");
    }

    if (i % 5 == 0) {
     System.out.print("FIVE");
    }
    System.out.println();
    continue;
   }

   if (i % 3 == 0) {
    System.out.print("THREE");
    if (i % 2 == 0) {
     System.out.print("TWO");
    }

    if (i % 5 == 0) {
     System.out.print("FIVE");
    }
    System.out.println();
    continue;
   }

   if (i % 5 == 0) {
    System.out.print("FIVE");
    if (i % 2 == 0) {
     System.out.print("TWO");
    }

    if (i % 3 == 0) {
     System.out.print("THREE");
    }
    System.out.println();
    continue;
   } else {
    System.out.println(i);
   }
  }
 }
}

Actual Output:

1
TWO
THREE
TWO
FIVE
TWOTHREE
7
TWO
THREE
TWOFIVE
11
TWOTHREE
13
TWO
THREEFIVE
TWO
17
TWOTHREE
19
TWOFIVE
THREE
TWO
23
TWOTHREE

Note: I have taken number 24 as input, you can pass any number as input this program will work for that. All the very best… 🙂

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Questions:

Let’s start with Core Java:

Coming to WebServices, Spring, Spring Boot, Spring Cloud and Microservices:

Coming into PCF:

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Problem:

Output:

Solution:

Actual Output:

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