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Factory Methods

 
Greenhorn
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Can Any one Explain me the question below..

Thanks in Advance

What is factory methods? When it is appropriate to use?

Why should we go for factory method?
 
Greenhorn
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whenever we want to have some control over the number of objects to be created for a class.

in such cases we create a private constructor, and static method in that class. and we call the private constructor from that static method. we can have count of objects created for that class using a static variable.
 
Ranch Hand
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Pattern p = Patten.compile("\\d");
Pattern p = Patten.compile("[a-s]");
here the patten object is created by the Pattern class, based on the given input..

this is example for factory pattern
 
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also:

DateFormat.getDateInstance()
NumberFormat.getInstance()
NumberFormat.getCurrencyInstance()
NumberFormat.getPercentInstance()
Calendar.getInstance()

SCJP 1.4
SCJP 5.0
 
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