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In an app with a small number of POJOs and lots of helper methods that operate on them, what's better performance-wise: to make the helper classes singletons or to make the methods static?
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They are faster — Static methods are slightly faster than instance methods because in instance methods, you are also working with an implicit this parameter. Eliminating that parameter gives a slight performance boost in most programming languages.
The Singleton pattern has several advantages over static classes. First, a singleton can extend classes and implement interfaces, while a static class cannot (it can extend classes, but it does not inherit their instance members).
The singleton, like any other instance of a class, lives on the heap. To its advantage, a huge singleton object can be lazily loaded whenever required by the application. On the other hand, a static class encompasses static methods and statically bound variables at compile time and is allocated on the stack.
The static method is similar to instance or class method of a class but with the difference that the static method can be called through the name of class without creating any instance of that class. A static method is also called class method as it is related with a class and not with individual instance of the class.
Static methods would be very slightly better performance and memory wise:
But honestly I'd probably still make it a singleton anyways. The gains you'd get by not doing it are likely so small that they would make zero difference, even in a mobile environment.
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