Marlabs Technical Lead Interview Questions and Answers

Q1. Mix of coding, theory and design questions
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Simple array questions

Q1. Difference between spring jpa and hibernate
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Spring JPA is a part of the Spring framework that provides an abstraction layer on top of JPA, while Hibernate is a standalone ORM framework.
• Spring JPA is a part of the Spring framework and provides additional features like transaction management, dependency injection, and aspect-oriented programming.

• Hibernate is a standalone ORM framework that provides mapping between Java objects and database tables, along with featu...read more
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Q2. What is cyclic barrier
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Cyclic barrier is a synchronization aid that allows a set of threads to wait for each other to reach a common barrier point.
• Cyclic barrier is similar to CountDownLatch but can be reused after the barrier point is reached.

• It is initialized with a count of the number of threads that must invoke await() before the barrier is tripped.

• Threads wait at the barrier until all threads have invoked await(), then the barrier is re...read more
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Q1. Builder design pattern in java
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Builder design pattern is a creational design pattern used to construct complex objects step by step.
• Builder pattern separates the construction of a complex object from its representation.

• It allows the same construction process to create different representations of the object.

• Useful when there are multiple ways to construct an object or when the object creation process is complex.

• Example: StringBuilder in Java allows ...read more
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Q2. Docker, MQ series involved
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Q3. JOIN Query with country , emp name
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JOIN query to retrieve country and employee name
• Use JOIN keyword to combine data from multiple tables

• Specify the columns to select from each table

• Use ON keyword to specify the relationship between the tables
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Q1. Ask about project and related skills
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Q2. Case scenario and problems
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Q1. About the tools and queries
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Q2. About the experience
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Q1. About the experience
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Q2. And the package relocation and shift
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Q1. One to one about the experience
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Q1. Print greater number using lambda function
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Use lambda function to print greater number
• Define a lambda function that takes two parameters

• Use the max() function inside the lambda to compare the two numbers

• Call the lambda function with two numbers to print the greater one
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Q2. Explain OOPs concepts
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OOPs concepts refer to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

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

• Abstraction: Hiding the complex implementation detail
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Q3. All major C++ topics were covered
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Q1. Singleton design pattern
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Q2. Code for Fibonacci series -- both iterative and recursive
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Fibonacci series code in iterative and recursive methods
• Iterative method: Use a loop to calculate Fibonacci numbers

• Recursive method: Define a function that calls itself to calculate Fibonacci numbers

• Example for iterative method: int fib(int n) { int a = 0, b = 1, c; for(int i = 2; i <= n; i++) { c = a + b; a = b; b = c; } return b; }

• Example for recursive method: int fib(int n) { if(n <= 1) return n; return fib(n-1) + f
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Q1. Print 1-10 using 2 threads, in correct order
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Use two threads to print numbers 1-10 in correct order
• Create two threads, one for printing odd numbers and one for printing even numbers

• Use synchronization mechanisms like mutex or semaphore to ensure correct order

• Example: Thread 1 prints 1, 3, 5, 7, 9 and Thread 2 prints 2, 4, 6, 8, 10
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Q2. How to do Unit testing in C++
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Unit testing in C++ involves writing test cases for individual units of code to ensure they work as expected.
• Use a unit testing framework like Google Test or Catch2 to write and run test cases

• Create separate test files for each unit of code being tested

• Use assertions to check the expected behavior of the code under test

• Mock dependencies or use dependency injection to isolate units for testing

• Run tests regularly to catc
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