Bean Life Cycle

The java class which represented as Spring Bean is called as Bean Class.

-> The java class which is managed by IOC is called as Spring Bean.

-> Spring Beans life cycle will be managed by IOC.

-> For Spring Beans Obj creation and Obj destruction will be taken by IOC container.

-> We can execute life cycle methods for Spring Bean.

-> In Spring Boot, we can work with Bean Lifecycle methods in 2 ways

1) By Implementing interfaces ( IntializingBean & DisposableBean )

2) By Using Annotations ( @PostConstruct & @PreDestory )

// Interface Approach

@Component

public class Motor implements InitializingBean, DisposableBean {

public Motor() {

System.out.println("Motor :: Constructor");

}

@Override

public void afterPropertiesSet() throws Exception {

System.out.println("afterPropertiesSet() method called....");

}

@Override

public void destroy() throws Exception {

System.out.println("destroy() method called....");

}

}

// Annotation Approach

@Component

public class Engine {

public Engine() {

System.out.println("Engine :: Constructor");

}

@PostConstruct

public void init() {

System.out.println("start engine....");

}

@PreDestroy

public void destroy() {

System.out.println("stop engine...");

}

}