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why noy make all my service class methos or DAO class methods static?

 
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In a typical Web application we have service layer and dao layer.
For example in service method i have four methods

Create(Customer customer)
Delete(Customer customer)
Update(Customer customer)
Get(Customer customer)

a) My doubt is all these 4 methods does not make use of class variables, so can i make all these 4 methods static?
b) Usually i never see in any application they make these static my question is when do we make methods static?
 
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