Persistent Systems Interview Questions, Process, and Tips

Q1. What is a comparator?
Ans. 
A comparator is a function that compares two objects to determine their ordering.
• Used in sorting algorithms to determine the order of elements

• Returns a negative value if the first object is less than the second, zero if they are equal, and a positive value if the first object is greater

• Commonly used in Java with the Comparator interface
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Q2. What is reentrant lock?
Ans. 
A reentrant lock is a synchronization primitive that allows a thread to re-enter a critical section it already holds.
• Prevents deadlock by allowing a thread to acquire the lock multiple times

• Each lock acquisition must be followed by a corresponding release

• Commonly used in multi-threaded programming to protect shared resources
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Q1. Deep discussion on OOPs concepts.
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Q2. .Net Core middleware, when we required custom middleware?
Ans. 
Custom middleware in .Net Core is required when we need to add additional processing logic to the request pipeline.
• Custom authentication

• Request logging

• Error handling

• Response compression
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Q1. Discussed on project architecture and challenges
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Q2. .Net Core design pattern and life time
Ans. 
Design patterns in .Net Core help in structuring code for better maintainability and scalability.
• Design patterns like Singleton, Factory, and Dependency Injection are commonly used in .Net Core.

• They help in separating concerns, improving code reusability, and making code more testable.

• Lifetime management in .Net Core refers to how long an object should exist in the application.

• Transient, Scoped, and Singleton are the t...read more
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Q1. Discussed on different project situation.
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Q1. Discussed on Role and responsibility
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Q1. Selenium commands
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Q2. Java program for prime number
Ans. 
A Java program to check if a number is prime or not.
• Create a function to check if a number is prime by iterating from 2 to the square root of the number.

• If the number is divisible by any number in that range, it is not prime.

• Handle edge cases like 0, 1, and negative numbers separately.
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Q3. Java program for printing repeated characters in a string
Ans. 
Java program to find and print repeated characters in a string
• Iterate through each character in the string

• Use a HashMap to store the count of each character

• Print characters with count greater than 1
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Aptitude exam and coding test

Q1. Datatypes in java
Ans. 
Java has various datatypes like int, double, boolean, etc. to store different types of values.
• Primitive datatypes include int, double, boolean, char, etc.

• Reference datatypes include classes, interfaces, arrays, etc.

• Examples: int num = 10; double price = 19.99; boolean isTrue = true;
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Q2. Write a star program
Ans. 
A star program prints a pattern of stars in a specific shape.
• Use nested loops to control the number of rows and columns

• Use if-else statements to determine when to print a star or a space

• Example: Print a pyramid of stars with 5 rows
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Q1. Program of duplicate of string
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Q1. Project Description as per resume.
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Q2. What is BERT? Explain the architecture
Ans. 
BERT is a pre-trained natural language processing model developed by Google.
• Bidirectional Encoder Representations from Transformers

• Utilizes transformer architecture with attention mechanisms

• Pre-trained on large corpus of text data for various NLP tasks

• Fine-tuned for specific tasks like text classification, question answering, etc.
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