Hitachi Digital Interview Questions and Answers

Q1. Sales strategies
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Q1. Technical round with live coding.
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Q2. Java 8 questions, spring boot related questions
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Q1. Spring boot, Kafka , logging caching , design patterns questions.
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Q1. Basic short interview mostly related with work experience and compensation
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Q1. Asked Kadane's algorithm, and some android related questions.
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Q1. Design a hashmap, and optimise it
Ans. 
Design and optimize a hashmap
• Choose a good hash function to minimize collisions

• Implement dynamic resizing to handle increasing load factor

• Consider using open addressing or separate chaining for collision resolution

• Use an efficient data structure for storing key-value pairs, such as an array or linked list
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Q1. Design a custom recyclerview with appropriate data structures
Ans. 
Custom recyclerview with appropriate data structures
• Create a custom adapter extending RecyclerView.Adapter

• Implement onCreateViewHolder() and onBindViewHolder() methods

• Use appropriate data structures like ArrayList or HashMap for efficient data handling

• Implement onClickListener for item clicks

• Use ViewHolder pattern for efficient view recycling
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Q1. What are your expectations related to work and salary
Ans. 
I expect fair compensation for my skills and experience, and a challenging work environment that allows for growth and learning.
• I am looking for a salary that is commensurate with my experience and skills.

• I am open to negotiation and willing to discuss salary and benefits.

• I am looking for a challenging work environment that allows me to learn and grow as a software engineer.

• I am interested in opportunities for professi...read more
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Q1. Skills related questions only
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Q1. Skills related questions only
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Q1. Salary related questions only
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Q1. Difference between static and final
Ans. 
Static is used to define class-level variables and methods, while final is used to define constants that cannot be changed.
• Static variables belong to the class itself, while final variables are constants that cannot be modified.

• Static methods can be called without creating an instance of the class, while final methods cannot be overridden.

• Static variables are shared among all instances of a class, while final variables...read more
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Q2. ArraysList vs LinkedList
Ans. 
ArrayList is better for random access, LinkedList is better for frequent insertions/deletions.
• ArrayList uses dynamic array to store elements, LinkedList uses doubly linked list.

• ArrayList provides fast random access to elements using index, LinkedList provides fast insertion/deletion at any position.

• Example: ArrayList is suitable for scenarios where random access is required like searching, LinkedList is suitable for sc...read more
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Q3. Describe Java8 Features
Ans. 
Java8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces are interfaces with a single abstract method, which can be implemented using lambda expressions.

• Streams provide a way to work with collections of objects in a functional style.

• Default methods allow inte...read more
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Q4. Gave one scenario to solve using streams in java8
Ans. 
Using streams in Java 8 to filter and map a list of numbers
• Create a list of numbers

• Use stream to filter out even numbers

• Use map to square each number

• Collect the results into a new list
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Q5. Multithreading- Write program to print even and odd numbers from 1 to 20 using 2 threads. 1 thread will responsible for printing even and another for Odd. And print in such a manner it should be alternate....read more
Ans. 
Program to print even and odd numbers from 1 to 20 using 2 threads alternately.
• Create two threads, one for printing even numbers and one for printing odd numbers.

• Use wait(), notify(), and notifyAll() to ensure alternate printing.

• Ensure synchronization between the two threads to avoid race conditions.

• Example: Thread 1 prints even numbers (2, 4, 6, ...) and Thread 2 prints odd numbers (1, 3, 5, ...).
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Q6. Why strings immutable
Ans. 
Strings are immutable to ensure data integrity and security.
• Immutable strings prevent accidental changes to data

• Immutable strings allow for safe sharing of data between different parts of a program

• Immutable strings help prevent security vulnerabilities like SQL injection attacks
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Q7. Outer Join SQL query
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Q8. What is the purpose of using default methods in java8?
Ans. 
Default methods in Java 8 allow interfaces to have method implementations, enabling backward compatibility and reducing code duplication.
• Default methods were introduced in Java 8 to provide a way to add new methods to interfaces without breaking existing implementations.

• They allow interfaces to have method implementations, which was not possible before Java 8.

• Default methods can be overridden in implementing classes to...read more
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Q1. 1 coding problem related to Anagrams
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Q2. 1 Java8 streams problem
Ans. 
Using Java8 streams to solve a problem
• Use stream() method to convert a collection into a stream

• Use filter() method to filter elements based on a condition

• Use map() method to transform elements

• Use collect() method to collect the elements into a new collection
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Q3. What are checked exceptions
Ans. 
Checked exceptions are exceptions that must be either caught or declared in the method signature.
• Checked exceptions are subclasses of Exception (excluding RuntimeException and its subclasses)

• Checked exceptions must be either caught using try-catch block or declared in the method signature using 'throws' keyword

• Examples of checked exceptions in Java include IOException, SQLException, and ClassNotFoundException
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Q4. Purpose of @SpringBootApplication annotation?
Ans. 
Annotation used to mark a class as a Spring Boot application
• Combines @Configuration, @EnableAutoConfiguration, and @ComponentScan annotations

• Used to bootstrap and launch a Spring application

• Automatically scans for Spring components in the package and sub-packages
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Q5. Use of @Qualifier
Ans. 
Annotation used in Spring to specify which bean to autowire
• Used to disambiguate when multiple beans of the same type are present

• Can be used with @Autowired to specify which bean to inject

• Helps in resolving dependencies when multiple beans of the same type are available
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Q6. What are microservices?
Ans. 
Microservices are a software development technique where an application is composed of small, independent services that communicate with each other.
• Microservices are designed to be small, focused on specific tasks, and independently deployable.

• Each microservice typically runs its own process and communicates with other services through APIs.

• Microservices allow for easier scalability, flexibility, and maintenance compar...read more
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Q7. Design patterns
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Q8. How microservices communicate with each other
Ans. 
Microservices communicate with each other through APIs, messaging queues, or service meshes.
• APIs: Microservices can communicate with each other by exposing APIs that allow them to send and receive data.

• Messaging queues: Microservices can use messaging queues like RabbitMQ or Kafka to send messages to each other asynchronously.

• Service meshes: Microservices can communicate through a service mesh like Istio, which handles...read more
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Q1. Asked about projects.
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Q2. Complete flow and business use case of the project
Ans. 
The project involves creating a web-based platform for online shopping with features like user registration, product browsing, shopping cart, and payment processing.
• User registers on the platform with personal information

• User browses products by category or search

• User adds products to the shopping cart

• User proceeds to checkout and makes payment

• Order is confirmed and user receives a confirmation email
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Q3. Interviewer was more concerned about matching the tech stack with job description
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Q1. Two Strings are anagram or not
Ans. 
Check if two strings are anagrams by comparing the frequency of characters.
• Create two arrays to store the frequency of characters for each string.

• Compare the frequency arrays to check if they are anagrams.

• Example: 'listen' and 'silent' are anagrams.
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Q2. Java and Spring boot questions
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Q1. System design basic HLD
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Q2. Previous project architecture
Ans. 
Previous project architecture involved microservices with Docker containers and Kubernetes for orchestration.
• Utilized microservices architecture for scalability and flexibility

• Deployed services in Docker containers for easy portability and consistency

• Managed containerized applications with Kubernetes for automated scaling and orchestration
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Q1. Need to find output of given code
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Q2. Solve some puzzles
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Duration: 1hr
Topics: Array, LinkedList,Stack

Q1. Write code for Insertion in a binary tree.
Ans. 
Code for insertion in a binary tree
• Create a new node with the given data

• If the tree is empty, make the new node as root

• Else, traverse the tree to find the appropriate position to insert the new node

• If the data is less than the current node, go to the left subtree

• If the data is greater than the current node, go to the right subtree

• Repeat until an appropriate position is found

• Set the new node as the child of the appropri
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Q2. Write code for quick sort
Ans. 
Quick sort is a divide-and-conquer algorithm that sorts an array by partitioning it into two sub-arrays.
• Choose a pivot element from the array

• Partition the array around the pivot element

• Recursively apply quick sort to the left and right sub-arrays

• Combine the sorted sub-arrays to get the final sorted array
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Q1. Various DBMS related question(JOINS, SORT, LIMIT)
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Q1. Tell us about yourself.
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Q2. Why do want to join the company
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Coding for python developer round.

Q1. Python django and dsa
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Q1. Normal just salary negotiation and all.
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