Software Engineering Interview Questions and Answers
Ques 11. Explain the term 'database normalization.' Why is it important?
Database normalization is the process of organizing data in a database to reduce redundancy and dependency. It ensures data integrity and reduces the chances of anomalies during data manipulation.
Example:
Breaking down a large table into smaller tables and establishing relationships to eliminate redundant data in a relational database.
Ques 12. What is the purpose of the 'try-catch' block in exception handling?
The 'try-catch' block is used to handle exceptions in a program. Code inside the 'try' block is executed, and if an exception occurs, it is caught and handled in the 'catch' block.
Example:
In Java, catching an 'IOException' when reading from a file within a 'try-catch' block.
Ques 13. Explain the concept of a RESTful API. What are the key principles of REST?
REST (Representational State Transfer) is an architectural style for designing networked applications. Key principles include statelessness, client-server architecture, and the use of standard HTTP methods (GET, POST, PUT, DELETE).
Example:
Designing a web API that uses HTTP methods for CRUD operations on resources.
Ques 14. What is the difference between a stack and a heap in memory management?
The stack is used for static memory allocation and stores function call information, local variables, etc. The heap is used for dynamic memory allocation and stores objects with varying lifetimes.
Example:
Allocating memory for a local variable on the stack. Allocating memory for an object with 'new' in C++ on the heap.
Ques 15. Explain the concept of dependency injection. How does it improve code maintainability?
Dependency injection is a design pattern where dependencies are injected into a class rather than being created within the class. It improves code maintainability by making classes more modular and easier to test.
Example:
Injecting a database dependency into a service class rather than creating it inside the class.
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