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From: Daniel Pitts <usenet@coloraura.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: "implements" does not mean "implements"
Date: Thu, 10 Nov 2016 09:02:55 -0800
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On 11/9/16 4:45 PM, Stefan Ram wrote:
>   Just a small thought I had on the train today:
>
>   "implements" does not always mean "implements".
>
>   For example, this compiles:
>
> interface A { void m(); }
>
> abstract class C implements A { public abstract void m(); }
>
> public final class Main
> { public static void main( final java.lang.String args[] )
>   { java.lang.System.out.println( "2016-11-10" ); }}
>
>   C does not implement A, yet is says »C implements A«.
>
>   The program compiles and prints
>
> 2016-11-10
>
>   .
>

Sure it does, it tells the compiler that any time you have an Object of 
type C, it implements interface A.  This is true, since any concrete 
subclass of C would need to implement void m();