TCS Java Software Developer Interview Questions and Answers

OOPs concepts are fundamental principles of object-oriented programming such as inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implemen...read more

Exception handling in Spring Boot involves using try-catch blocks, global exception handlers, and custom exception classes.

• Use try-catch blocks to handle exceptions within specific methods.

• Implement global exception handlers to handle exceptions across the entire application.

• Create custom exception classes to handle specific types of exceptions.

• Use the @ExceptionHandler annotation to define methods that handle specific...read more

JPA entity graphs define the relationships between entities and specify which attributes to fetch.

• JPA entity graphs are used to optimize database queries by specifying the relationships between entities.

• They allow developers to define which attributes of an entity should be fetched from the database.

• Entity graphs can be defined using annotations or programmatically using the JPA API.

• By using entity graphs, developers c...read more

JVM memory model defines how Java programs allocate and manage memory.

• JVM memory model is divided into several areas like heap, stack, method area, etc.

• Heap is used for dynamic memory allocation, while stack is used for method calls and local variables.

• Method area stores class-level data like bytecode, constant pool, etc.

• JVM memory model ensures memory safety through garbage collection.

• Examples of JVM memory management...read more