Learn Java from Scratch - A Beginner's Guide - Step 05 - Exploring Spring Beans - PostConstruct and PreDestroy

The video tutorial explains the use of post construct and pre destroy annotations in Spring. It demonstrates how to create a simple class with dependencies and implement initialization logic using post construct. The tutorial also covers how to use pre destroy for cleanup tasks before a bean is removed from the application context.

What is the primary purpose of the PostConstruct annotation in Spring?

• To destroy a bean before it is removed from the context

• To initialize a bean before dependencies are injected

• To manage transactions in a Spring application

• To perform initialization logic after dependencies are injected

What is the role of the PostConstruct annotation in the bean lifecycle?

• It is used to manage transactions

• It is used to perform initialization after dependency injection

• It is used to define bean scope

• It is used to destroy a bean

What is a typical use case for the PostConstruct annotation?

• To log bean creation

• To close database connections

• To manage bean transactions

• To fetch data from a database for initialization

In the context of Spring, what does the PreDestroy annotation help with?

• Initializing a bean

• Injecting dependencies

• Cleaning up resources before a bean is removed

• Managing bean scopes

Which method is typically used to release resources held by a bean in Spring?

• destroy()

• getReady()

• cleanup()

• initialize()

When is the method annotated with PreDestroy called in the Spring lifecycle?

• Before the bean is removed from the context

• After the bean is put into service

• After the bean is removed from the context

• Before the bean is put into service

Which annotation would you use to ensure a method is called before a bean is destroyed?

• PostConstruct

• Component

• PreDestroy

• Autowired