1. Different annotations used in Spring Boot 2. What is Microservice architecture, how microservices communicate with each other 3. What is call by value and call by reference 4. What are SOLID Principles, what is dependency injection 5. Write sample program for finding occurrence of substring in a string.

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Answers to common technical questions related to Spring Boot, microservices, programming concepts, and sample program implementation.

Spring Boot annotations include @RestController, @Service, @Component, @Autowired, @RequestMapping, etc.
Microservice architecture is a design approach where an application is composed of small, independent services that communicate over HTTP/REST or messaging protocols.
Call by value passes a copy of the variable's value to a function, while call by reference passes a reference to the variable itself.
SOLID Principles are a set of five design principles in object-oriented programming: Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion.
Dependency injection is a design pattern where the dependencies of a class are injected from the outside, typically using frameworks like Spring.
Sample program for finding occurrence of substring in a string: String str = "Hello, World!"; int count = str.length() - str.replace("o", "").length();

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