InstaWeb Labs Interview Questions and Answers

A Controller is used for handling requests in a web application, while a Rest Controller specifically handles RESTful requests.

• A Controller is a component in the MVC architecture that handles user requests and returns a response.

• A Rest Controller is a specialized type of Controller that is used for handling RESTful requests.

• Rest Controllers are typically used in web services to handle HTTP requests and return JSON or XML responses.

• Rest Controllers often use annotations like @...read more

Reflection API is a feature in Java that allows examining and modifying the behavior of classes, methods, and fields at runtime.

• Allows inspecting and modifying classes, methods, and fields at runtime

• Provides a way to access metadata about classes and their members

• Enables dynamic loading of classes and interfaces

• Useful for creating generic code, serialization, and testing frameworks

The application.properties file is used to store configuration settings for a Java application.

• It is a key-value pair file where each line represents a configuration setting.

• It is commonly used in Spring Boot applications to configure various properties such as database connection details, server port, logging levels, etc.

• The file is typically located in the src/main/resources directory of the project.

• Properties can be accessed programmatically using the Spring Environment ob...read more

Heap memory is used for dynamic memory allocation, while stack memory is used for static memory allocation.

• Heap memory is used for storing objects and is managed by the JVM, while stack memory is used for storing method calls and local variables.

• Heap memory is larger in size compared to stack memory.

• Objects stored in heap memory can be accessed globally, while variables in stack memory are only accessible within the scope of the method.

• Example: When you create a new object in...read more

The enhanced version of level 1 involves more complex tasks and challenges.

• Implement additional features to improve functionality

• Optimize code for better performance

• Enhance user interface for improved user experience

Polymorphism is the ability of a single function or method to operate on different types of data.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Animal superclass with subclasses Dog and Cat. Both Dog and Cat can be treated as Animals.