Newbie to spring

[vipul John]

Hi friends,

I am a newbie to spring framework.just started.
Going through the net i have found this site better to read.

"A primary component of the core container is the BeanFactory, an implementation of the Factory pattern."

After reading this line, i gone through Factory pattern.

In wikipedia, i read about Factory pattern. There i came across this statement.

"Factory pattern is an abstraction of a constructor, and can be used to implement various allocation schemes"

what is meant by abstraction of constructor?
what we should use Factory pattern and what it is meant to spring container?


Thanks,
Vipul Kumar

[Rajkamal Pillai]

Well the Factory Pattern is a Creational pattern. According to Wikipwedia -> Creational Pattern

Spring provides a layer of abstraction over creation of objects and decouples Object creation logic from Business logic. In this scenario the Spring Container is responsible for the creation of Object(s).

Cheers,
Raj.

[vipul John]

Thanks Raj,

I gone through creational pattern in wikipedia. i did not understand this statement.

Creational design patterns are further categorized into Object-creational patterns and Class-creational patterns. Where, Object-creational patterns deal with Object creation and Class-creational deal with Class-instantiation.

object creation and class-instantiation both are same. but why did he make the difference.?

Thanks
Vipul.

[Rajkamal Pillai]

Not sure of why he mentioned those separate.

Could be that he intended -
Object creation: Creation of the Object, allocating of memory for properties etc.
Class instantiation: Initialization of properties (default values or the values set by the DCOnstructor.)

I am not too sure and I just am trying to give a difference between the two.

Cheers,
Raj.