Velocity Business Solutions Interview Questions and Answers

Multithreading involves multiple threads within the same process, while multiprocessing involves multiple processes.

• Multithreading shares the same memory space, while multiprocessing has separate memory space for each process.

• Multithreading is more lightweight and efficient for I/O-bound tasks, while multiprocessing is better for CPU-bound tasks.

• Multithreading can lead to race conditions and synchronization issues, while multiprocessing avoids these problems by using separate...read more

String is immutable in Java to ensure security, thread safety, and optimization.

• Immutable strings prevent accidental changes to data.

• String pool optimization is possible due to immutability.

• Thread safety is ensured as strings cannot be modified concurrently.

• Security is enhanced as sensitive data cannot be altered.

Middleware is a framework of hooks into Django's request/response processing. It is used to perform actions before and after the view is called.

• Middleware is a Python class that defines hooks that can alter the request/response cycle.

• It can be used for authentication, logging, error handling, etc.

• Middleware classes are defined in settings.py and executed in the order they are listed.

• Example: Django's AuthenticationMiddleware is a built-in middleware that handles user authenti...read more

Java is a high-level programming language known for its portability, security, and object-oriented features.

• Java is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM).

• It is used for developing a wide range of applications, from mobile apps to enterprise systems.

• Java is known for its strong security features, such as sandboxing and encryption.

• It is an object-oriented language, allowing for modular and reusable code.

• Popular frameworks and l...read more

A thread is a lightweight process that can run concurrently with other threads within the same process.

• Threads allow for parallel execution of tasks within a single process

• Threads share the same memory space and resources of the process

• Threads can communicate with each other through shared variables or message passing

• Examples: Java threads, POSIX threads (pthreads) in C

A map is a collection of key-value pairs where each key is unique and used to retrieve the corresponding value.

• Maps are commonly used in programming to store data in an organized manner.

• Keys in a map are used to access the associated values.

• Examples of maps include dictionaries in Python and HashMaps in Java.

A collection is a group of related objects or data items that are stored together.

• Collections can be used to store and manipulate groups of data in programming.

• Examples include arrays, lists, sets, and maps.

• Collections provide methods for adding, removing, and accessing elements.

Jinja templating is a popular template engine for Python web development, used in frameworks like Flask and Django.

• Jinja allows for dynamic content generation in HTML templates

• It uses double curly braces {{ }} for placeholders and control structures like loops and conditionals

• Jinja templates can be extended and included for reusability

• Example: {{ variable }} or {% for item in list %}