Mabsquare Software Technologies Java Software Engineer Interview Questions and Answers

IOC stands for Inversion of Control and DI stands for Dependency Injection.

• IOC is a design pattern that allows the flow of control to be inverted, where the framework controls the flow of the program.

• DI is a technique where the dependencies of an object are injected into it, rather than the object creating them itself.

• IOC and DI are closely related and often used together in software development.

• Spring Framework is a p...read more

IOC stands for Inversion of Control. Its components are Dependency Injection and Aspect Oriented Programming.

• Dependency Injection: injecting dependencies into a class instead of creating them within the class

• Aspect Oriented Programming: separating cross-cutting concerns from the main logic of the application

• Examples: Spring Framework, Guice

Scopes in Spring refer to the lifecycle of a bean and its visibility within the application context.

• Spring has four standard scopes: singleton, prototype, request, and session.

• Singleton scope creates only one instance of a bean and is the default scope.

• Prototype scope creates a new instance of a bean every time it is requested.

• Request scope creates a new instance of a bean for each HTTP request.

• Session scope creates a

Detach and merge are used in Spring to manage the persistence of entities.

• Detach is used to remove an entity from the persistence context.

• Merge is used to update the state of a detached entity and merge it back into the persistence context.

• Both detach and merge are commonly used in Spring Data JPA.

• Example: entityManager.detach(entity); entityManager.merge(entity);

Design patterns are reusable solutions to common software problems.

• Design patterns provide a standard way of solving recurring problems in software development.

• There are three types of design patterns: creational, structural, and behavioral.

• Examples of design patterns include Singleton, Factory, Observer, and Decorator.

• Design patterns can improve code readability, maintainability, and scalability.

Executor framework provides a way to execute tasks asynchronously using multithreading.

• Executor framework provides a way to manage thread pools and execute tasks asynchronously.

• It uses a pool of threads to execute tasks and provides a way to submit tasks to the pool.

• The tasks are executed in a separate thread, allowing for parallel execution.

• Executor framework provides different types of thread pools like fixed, cached...read more

Executor framework is used to manage threads and execute tasks asynchronously.

• Executor framework provides a way to manage threads and execute tasks asynchronously.

• It provides a thread pool and a queue to manage tasks.

• It helps in improving the performance of the application by reducing the overhead of creating and destroying threads.

• It also provides a way to handle exceptions and errors in the tasks.

• Example: Executors.n...read more