Virtusa Consulting Services Senior Pega Developer Interview Questions and Answers

Q1. What is Dependency Injection?
Ans. 
Dependency Injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Allows for easier testing by providing mock dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Examples: Constructor injection, Setter injection, Interface injection
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Q2. How to handle exception in java
Ans. 
In Java, exceptions can be handled using try-catch blocks to catch and handle specific exceptions.
• Use try-catch blocks to catch exceptions and handle them gracefully

• Use multiple catch blocks to handle different types of exceptions

• Use finally block to execute code regardless of whether an exception is thrown or not

• Throw custom exceptions using throw keyword
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Q1. In Java8, different between flatmap and map
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map transforms each element in a stream, while flatMap transforms each element into multiple elements
• map applies a function to each element in a stream and returns a new stream of the results

• flatMap applies a function that returns a stream for each element in the original stream, then flattens the streams into a single stream

• Example: map - stream.map(x -> x * x), flatMap - stream.flatMap(str -> Arrays.stream(str.split(
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Q2. How to handle the ConcureentModificationException
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ConcurrentModificationException occurs when a collection is modified while iterating over it.
• Use Iterator to iterate over the collection instead of foreach loop.

• If modification is necessary, use Iterator's remove() method instead of collection's remove() method.

• Consider using synchronized collections or ConcurrentHashMap to avoid ConcurrentModificationException.
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Q1. Core Java Questions
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Q2. Spring Boot Questions
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Q1. HighLevelDesign Questions
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Q2. Basic Docker questions
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Basic aptitude questions held online with their portal

Broad coding and basic oops

Q1. About hr questions
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Logical thinking was important for preparation

Q1. About the field u chose provide with examples
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Q2. Explain about sql
Ans. 
SQL is a programming language used for managing and manipulating relational databases.
• SQL stands for Structured Query Language

• It is used to create, modify, and retrieve data from databases

• SQL is a declarative language, meaning you specify what you want to achieve rather than how to achieve it

• Common SQL commands include SELECT, INSERT, UPDATE, and DELETE

• SQL is used in various database management systems like MySQL, Orac
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Q1. The second round was also on techincal and the deep dicussion on field u chose
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Q1. Tell me about yourself
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Q2. Covered on all aspects and personality
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Q1. Define SOLID principles
Ans. 
SOLID principles are a set of five design principles for writing maintainable and scalable code.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Classes should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correct...read more
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Q2. How is data binding achieved in WPF. Show with an example
Ans. 
Data binding in WPF allows synchronization of data between UI elements and data sources
• Data binding in WPF can be achieved using the Binding markup extension

• Properties of UI elements can be bound to properties of data objects

• Example: binds the Text property of TextBlock to the Name property of data object
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There was Aptitude, Technical and Coding. Coding there were 4 sections for 4 languages (C, C++, java, Python) We had to do atleast 2. Technical MCQs were based on OS, CN, DSA, C, C++, Python (Numpy, Panda) and Java

Q1. Mainly asked OS, and since I'm from EEE dept, i wasnt well versed in CN, so no CN questions were asked to me. My primary coding language was Python, so some questions regarding the python was asked. I was ...read more
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Q1. Basic Spirnnboot question
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