Factory Pattern - help needed !!!!

[R Sawant]

Hi all,
What exactly is the advantage of using Factory pattern ? When this pattern is useful ? Any useful tutorial(with examples) for Factory pattern ? Thanks in advance.

Ramdas.

[rehans oberoi]

we are using factory pattern ,
when we want to genearalize the concept,
we can generalize by making an interfce.
i mean to say , making a core interface .called factory
and than extend it according to requirments
does it make some sense

[Bert Bates]

Now I don't want anyone to think that we have anything against the Factory pattern, because we don't! It's a great pattern, Gamma used it all the time

But, it's not on the SCWCD exam! For the exam you need to learn these J2EE patterns:

- Business Delegate
- Service Locator
- Transfer Object
- Intercepting Filter
- MVC
- Front Controller

If you see any other patterns mentioned on the exam you'll know that they are "distractor" answers, not the real answer!

hth,

Bert

[Raghu Shree]

Hi,
The factory pattern is a creational pattern. Think the follwing scenario to used factory pattern

1. When the class doesn't know which class of object to be create.
2. A class specifies its subclasses to specify which class object to be create.
3. Based the value the subclass decide to create the specified object.