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What are the differences between a static variable and a non - static variable (java)?
2-3 valid differences will be highly appreciated
3 Respostas
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Sure. Tried to fit any extra info I could.
Static: The member is bound to the class itself
* Cannot be overrided
As a result, Polymorphism cannot occur
* Stays the same throughout all object instances
* Can be called via class name
* Can also be called via class instance
// Extra
* The Static Block will be called when the class loads
static{
}
Non Static: The member is bound to an instance of the class
* Can be overrided
Polymorphism can occur
* All object instances have their own members
* Must be called via class instance
// Extra
* The initializer block is called on object instantiation (Similar to a constructor).
{
}
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static makes the member bound to the class itself, so something that's non-static means the member is bound to an instance of the class.
For example,
if I have the non-static method:
void doStuff(){
}
In order to call it, I must create an instance of the class.
myClass obj = new myClass();
obj.doStuff();
This also means I cannot directly call a non-static method from a static method. This is due to not having a class instance in the static block.
There's also some other things that happen as a result of making something bound to the class. (But that isn't exactly what static means).
Such as,
* You can call a static member via className, rather than object instance.
* You cannot override a static member.
* A static variable will be the same throughout all object instances. For example, a static variable can be used to keep track of how many objects were created in that class.
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Thanks @RestoringFaith
If feasible, can you write in point wise form or tabular form with their respective differences side by side