DreamZone Interview Questions and Answers

Interface is a contract that defines the methods a class must implement, while an abstract class can have both implemented and abstract methods.

• Interface can only have abstract methods and cannot have any implementation, while abstract class can have both abstract and implemented methods.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Interfaces are used to achieve multiple inheritance in Java, while abstract classes are used to provide ...read more

A stack is a data structure that follows the Last In First Out (LIFO) principle, while a queue follows the First In First Out (FIFO) principle.

• Stack: Last In First Out (LIFO), used for function calls, undo operations.

• Queue: First In First Out (FIFO), used for printing tasks, message queues.

Identify bottlenecks, analyze code, optimize algorithms, utilize caching, and consider hardware upgrades.

• Identify bottlenecks in the application by profiling and monitoring performance.

• Analyze the code to find inefficient algorithms or database queries.

• Optimize algorithms and data structures to improve efficiency.

• Utilize caching mechanisms to reduce redundant computations.

• Consider hardware upgrades such as increasing memory or CPU power if necessary.

Functional programming focuses on functions and immutability, while object-oriented programming focuses on objects and encapsulation.

• Functional programming uses pure functions that do not have side effects.

• Object-oriented programming uses objects that encapsulate data and behavior.

• In functional programming, data is immutable and functions are first-class citizens.

• In object-oriented programming, objects can have state and behavior.

• Functional programming languages include Haske...read more

I use print statements, logging, and debugging tools to identify and fix issues in my code.

• I start by reviewing the code and understanding the logic behind it.

• I use print statements to check the values of variables at different points in the code.

• I utilize logging to track the flow of the program and identify any errors.

• I use debugging tools like breakpoints and step-through debugging to pinpoint the exact location of the issue.

• I also collaborate with team members to get fres...read more