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When and when not to use static variables?

Nikolas Bernadel
Greenhorn

Joined: Aug 09, 2012
Posts: 9

Let's say I plan on instantiating one instance of a Car object. Since there's only ever going to be one instance of Car, does it matter if the variables within it are static?
Jayesh A Lalwani
Bartender

Joined: Jan 17, 2008
Posts: 2052
    
  22

Any member variables in singleton objects can cause problems, whether they are static or not. If your singleton Car object is being called by multiple threads, and any of those variables store information that is relevant to one thread, then you will run into concurrency issues
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 36508
    
  16
Yes, it does matter. You should, a a general rule, avoid things static unless you have a good reason to make them static. If the fields belong to the object, they belong to the object, and that means not static.
 
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