What is the difference between abstract classes and interfaces in Java, and when would you use each one in a real project?

How do you build and secure a REST API using Spring Boot, and what is the role of annotations like @RestController, @Service, and @Repository?

How would you optimize a slow SQL query in a production system, and what techniques (such as indexing or caching) would you use to improve performance?

Question

What is the difference between abstract classes and interfaces in Java, and when would you use each one in a real project?

How do you build and secure a REST API using Spring Boot, and what is the role of annotations like @RestController, @Service, and @Repository?

How would you optimize a slow SQL query in a production system, and what techniques (such as indexing or caching) would you use to improve performance?

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