Java - interface passing itself as a parameter

Asked Jan 10 '17 at 21:42

Active Jan 10 '17 at 21:42

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What about an interface that passes itself as a parameter in a method? How das that work? I always thought that an interface is abstract - so how can it be used just like that inside a method?

The only post I could find according to that topic did not really satisfy me.

public interface Comparable{
     boolean compare(Comparable comparable);
}

edited May 23 '17 at 11:46

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asked Jan 10 '17 at 21:42

jublikon

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In order to use any interface there must be a concrete type; it is the concrete type that is *actually* passed. – Elliott Frisch Jan 10 '17 at 21:44
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An interface reference (like this `comparable`) is just a reference to an object that implements that interface. – Jorn Vernee Jan 10 '17 at 21:45

Java - interface passing itself as a parameter

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