It correct to define an outer class as static which have inside also a static class? Only one instance of outer and inner classes is needed. Can outer class be abstract and it’s enclosed class be static?
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It correct to define an outer class as static which have inside also a static class? Only one instance of outer and inner classes is needed. Can outer class be abstract and it’s enclosed class be static?
No, a top level class can’t be static. The meaning of “static” in a class declaration is only relevant to nested classes. You can certainly have a static nested class within an abstract class though.
From the JLS section 8.1.1:
Note that if you want “only one instance” of a class, you should potentially make it a singleton – which is entirely separate, and not something which affects the class declaration itself.