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Someone told me:
If you are using Eclipse and don’t see any blue words (i.e. member variables) in your methods, then those methods should really be static methods, as long as the parameters (if there are any) are primitive types, or (in the case of object references) are immutable and/or thread-safe.
Is there any other criteria that a Java developer should consider when deciding whether an instance method should really be a static method instead?
Put it simply, if it is pure “helper/function” which does not modify internal state of object, it’s good candidate for static method.