10+ EPAM Systems Software Developer Interview Questions and Answers

Use a boolean array to track presence of each alphabet in the sentence.

• Create a boolean array of size 26 to track presence of each alphabet.

• Iterate through the sentence and mark the corresponding index in the array as true.

• Check if all elements in the array are true to determine if sentence has all alphabets.

Explanation of arrayList, link List, Exception vs RunTime exception, Executors, copy/write array, and Java8 coding question using streams.

• ArrayList and LinkedList are both implementations of the List interface in Java. ArrayList uses a dynamic array to store elements, while LinkedList uses a doubly linked list.

• Exceptions are checked at compile time, while RuntimeExceptions are unchecked and occur at runtime. Custom classes can throw both types of exceptions.

• Executors in Java ...read more

The latest version of Java is Java 17.

• Java 17 was released on September 14, 2021.

• It comes with new features like sealed classes, pattern matching for switch statements, and more.

• It also includes performance improvements and security updates.

Sort array of strings lexicographically and by length

• Use built-in sorting functions in programming languages like sort() in Python or Arrays.sort() in Java

• For lexicographical sorting, use default comparison function

• For length-wise sorting, create a custom comparison function based on string length

call, apply, and bind are methods in JavaScript used to manipulate the context of a function.

• call - calls a function with a given 'this' value and arguments provided individually.

• apply - calls a function with a given 'this' value and arguments provided as an array.

• bind - creates a new function that, when called, has its 'this' keyword set to the provided value.

Object-oriented programming concepts that focus on classes and objects

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class)

• Inheritance: Ability of a class to inherit properties and behavior from another class

• Polymorphism: Ability to present the same interface for different data types

• Abstraction: Hiding the complex implementation details and showing only the necessary features

Company policies and locations

• Our company has strict policies regarding data privacy and security

• We have multiple locations across the country and internationally

• Each location has its own set of policies and procedures

• Employees are expected to adhere to all company policies regardless of location

Spring Boot is a Java-based framework used for creating standalone, production-grade Spring-based Applications.

• Spring Boot simplifies the process of creating Spring applications by providing a set of default configurations.

• It allows developers to quickly set up and run standalone Spring applications.

• Spring Boot includes embedded servers like Tomcat, Jetty, or Undertow, making it easy to deploy applications.

• It provides production-ready features such as metrics, health checks, ...read more

Move all zeros in an array of strings to the end.

• Iterate through the array and keep track of the count of zeros encountered.

• Remove each zero encountered and append it to the end of the array.

• Continue this process until all zeros are moved to the end.

Flatten an array of strings into a single string

• Use the flatMap method to concatenate all strings in the array

• Alternatively, use the reduce method to combine all strings into one

• Ensure to handle any nested arrays within the main array