Interview Questions and Answers

Both have their own advantages and disadvantages depending on the use case.

• Runnable is preferred for code reusability and flexibility.

• Thread class is preferred for more control over threads and better performance.

• Choosing between the two depends on the specific requirements of the project.

• For example, if the project requires multiple threads to share a single object, Runnable is a better choice.

• On the other hand, if the project requires fine-grained control over thread execut...read more

Session can be maintained in Spring using HttpSession and Spring Session

• HttpSession can be used to store session attributes

• Spring Session provides additional features like distributed sessions

• Session can be configured using annotations or XML configuration

• Session timeout can be set using server configuration or programmatic approach

Deployment on server involves building, testing and transferring code to a production environment.

• Create a build of the code

• Test the build in a staging environment

• Transfer the build to the production server

• Configure the server to run the new build

• Monitor the deployment for any issues

Multi threading is the ability of a program to perform multiple tasks concurrently.

• It allows for better utilization of CPU resources

• It can improve the responsiveness of an application

• It can also introduce synchronization issues and race conditions

• Examples include web servers handling multiple requests simultaneously and video games rendering graphics while processing user input

There are two types of storages in JVM: Heap and Stack.

• Heap is used for dynamic memory allocation and is shared among all threads.

• Stack is used for static memory allocation and is private to each thread.

• Objects are stored in the heap while local variables and method calls are stored in the stack.

• Heap is larger than stack and can cause OutOfMemoryError if not managed properly.

Smoke testing is a preliminary testing to check if the basic functionalities of a software application are working fine.

• Performed at the beginning of the testing process

• Focuses on testing the critical functionalities

• Not exhaustive testing, just a quick check to see if the application can be further tested

• Helps in identifying major issues early in the development cycle