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I'm learning Java (and OOP) and although it might irrelevant for where I'm at right now, I was wondering if SO could share some common pitfalls or good design practices.
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Static method means which will exist as a single copy for a class. But instance methods exist as multiple copies depending on the number of instances created for that class. Static methods can be invoked by using class reference. Instance or non static methods are invoked by using object reference.
You should consider making a method static in Java : 1) If a method doesn't modify the state of the object, or not using any instance variables. 2) You want to call the method without creating an instance of that class.
A static method is a method that belongs to a class, but it does not belong to an instance of that class and this method can be called without the instance or object of that class. Every method in java defaults to a non-static method without a static keyword preceding it.
Static methods can be called without the object of the class. Instance methods require an object of the class. Static methods are associated with the class. Instance methods are associated with the objects.
One important thing to remember is that static methods cannot be overridden by a subclass. References to a static method in your code essentially tie it to that implementation. When using instance methods, behavior can be varied based on the type of the instance. You can take advantage of polymorphism. Static methods are more suited to utilitarian types of operations where the behavior is set in stone. Things like base 64 encoding or calculating a checksum for instance.
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