[Sprint] Bean Scope Singleton cs Prototype

We can define a class to be Singleton or Prototype. If the class was defined as Prototype, then everytime when we use new keyword, it will create a new instance.

// Singleton
@Service("customerService")
@Scope(ConfigurableBeanFactory.SCOPE_SINGLETON)
public class CustomerServiceImpl implements CustomerService {}

// Prototype
@Service("customerService")
@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public class CustomerServiceImpl implements CustomerService {}