🚀 go-pugleaf

"Yonatan Taub" <yonatanta@bashan.co.il> writes:

> Why does the compiler issues a compilation error when using the syntax
> 
> public MyInterface implements AnotherInterface

Because your interface cannot - by the nature of an interface -
provide an implementation - as in method bodies - of the other
interface. Thus the keyword doesn't make sense in that context.

> When referring to outer objects or variables within an inner class they have
> to be declared final otherwise you get a compilation error.
> What's the reason for that?

Because local variables are passed by value to the constructor of the
inner class, and to ensure that the programmer will not believe any
changes made to them after construction of the "inner object" will
have effect there, the variables have to be final.

If you have a parameter that you need to be non-final, just make a
final "alias" for it with another local variable.