EPAM Systems Java Developer Interview Questions, Process, and Tips

2 coding question (1st reverse a string without changing position of special character. 2nd remove elements before '#') + 20 mcqs

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Q1. Rearrange string
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Q2. Create form using react.js
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Q3. Longest prefix of strings in array
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Q1. Introduce your self
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Q2. Basic hr question
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Q1. Stream api coding
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Q2. Interface vs abstract
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Interface defines a contract for classes to implement, while abstract class provides partial implementation.
• Interface can have only abstract methods, while abstract class can have both abstract and concrete methods.

• A class can implement multiple interfaces but can only extend one abstract class.

• Interfaces are used for achieving multiple inheritance in Java.

• Abstract classes are used when some common functionality needs
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Q1. Microservices design pattern
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Microservices design pattern is an architectural style that structures an application as a collection of loosely coupled services.
• Each service is responsible for a specific function and can be developed, deployed, and scaled independently.

• Communication between services is typically done through APIs, allowing for flexibility and resilience.

• Microservices promote agility, scalability, and maintainability in large and com...read more
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Q2. Solid principal
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Q1. Java based questions
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Q2. Count frequency of elements using java 8
Ans. 
Using Java 8 streams to count frequency of elements in an array of strings
• Use Java 8 streams to convert the array to a map with element as key and count as value

• Use Collectors.groupingBy and Collectors.counting to achieve this

• Example: Arrays.stream(array).collect(Collectors.groupingBy(Function.identity(), Collectors.counting()))
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Q1. Java + Springboot depth questions
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Q2. Permgen, metaspace
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Q1. Focused on advanced core java and spring
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Q2. Cap theorem, service discovery
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Q1. Short introduction call. Told about company, job description and position. And gave some general tips about subjects to get prepared for the tech interview...
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Q1. Java Core, Collections, OOP principles, Concurrency
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Q2. Spring Framework, Annotations, Transactional, Strings, Immutable
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Q3. ACID, Isolation Levels, Optimistic Lock
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Q4. Small coding task, preferable using Streams...
Ans. 
Filter out strings starting with 'a' and convert to uppercase using Streams
• Use Stream.filter() to filter out strings starting with 'a'

• Use Stream.map() to convert remaining strings to uppercase

• Collect the result back into an array using Collectors.toList()
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Q5. Small SQL challenge, to implement a query for given examples...
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Implement a SQL query for given examples
• Use SELECT statement to retrieve data from tables

• Use WHERE clause to filter results based on conditions

• Use JOIN clause to combine data from multiple tables if needed
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