TCS Java Developer Interview Questions, Process, and Tips

Bean scope in Spring determines the lifecycle and visibility of a bean in the Spring container.

• Bean scope defines how long a bean lives and how many instances are created

• Common scopes include singleton, prototype, request, session, and application

• Singleton scope creates a single instance per Spring container, prototype creates a new instance each time it is requested

Servlet is a Java class that handles requests and responses, while JSP is a technology that simplifies the creation of dynamic web pages.

• Servlet is a Java class that extends the capabilities of servers to respond to requests. It is used to create dynamic web content.

• JSP is a technology that simplifies the creation of dynamic web pages by allowing Java code to be embedded in HTML pages.

• Servlets are used to handle busine...read more

Spring Boot validation is a feature that allows developers to validate input data in a Spring Boot application.

• Spring Boot validation is used to ensure that the data entered by the user meets certain criteria.

• It can be applied to request parameters, request bodies, and path variables.

• Annotations like @NotNull, @Size, @Email, etc., are commonly used for validation.

• Custom validation logic can also be implemented using cu

Garbage collection is the process of automatically reclaiming memory occupied by objects that are no longer in use by the program.

• Garbage collection is a feature in Java that automatically manages memory by deallocating memory for objects that are no longer needed.

• It helps in preventing memory leaks and ensures efficient memory usage.

• Garbage collection runs in the background and identifies objects that are no longer re...read more

Method overloading is when multiple methods in the same class have the same name but different parameters.

• Allows multiple methods with the same name but different parameters to be defined in a class.

• Parameters can differ in number, type, or order.

• Example: void print(int a) and void print(String s) are overloaded methods in the same class.

Stack memory is used for static memory allocation and execution of thread-specific variables, while heap memory is used for dynamic memory allocation.

• Stack memory is used for static memory allocation, such as local variables and function call stack.

• Heap memory is used for dynamic memory allocation, such as objects created using 'new' keyword.

• Stack memory is limited in size and typically faster to access, while heap mem...read more

Patch and put are HTTP methods used for updating resources on a server.

• PATCH is used to partially update a resource, while PUT is used to completely replace a resource.

• PATCH requests only include the changes that need to be made, while PUT requests require sending the entire updated resource.

• PATCH is often used for incremental updates, while PUT is used for full updates.

• Example: PATCH request to update the 'name' field...read more

Runnable and Callable are interfaces in Java for creating threads. Runnable is used for tasks that don't return a result, while Callable is used for tasks that return a result.

• Runnable is a functional interface with a single run() method, while Callable is a generic interface with a single call() method.

• Runnable tasks are executed using the void run() method, while Callable tasks are executed using the Future call() me...read more