Spring learning notes-three ways for Spring to instantiate Bean

Spring learning notes-three ways for Spring to instantiate Bean

1. Use the class constructor for instantiation
This is the most familiar and commonly used one.

This is actually implemented by calling the default constructor of UserServiceBean.
2. Static factory Method

public class UserServiceBeanFactory {    public static UserServiceBean createUserServiceBean(){        return new UserServiceBean();    }}

The configuration file is configured as follows:

3. Use the instance factory method for instantiation

public class UserServiceBeanFactory {    public UserServiceBean createUserServiceBean(){        return new UserServiceBean();    }}

This method differs from the second method in that the method is non-static. The Xml configuration is as follows: