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Java Forum / General / April 2008

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generics: how to tell more about the parameter?

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Mikhail Teterin - 29 Apr 2008 22:37 GMT
Hi!

I'd like to promise certain things about the parameter of a generic:

public class Foo<Bar implements Something> {
...
}

but that's a syntax error immediately -- javac expects a closing `>' right
where the space after `Bar' is in the above example...

How can I do this -- so that I can rely on Bar's features inside Foo and
have the compiler enforce the possible Bar's compliance?

Thanks!

-mi
Joshua Cranmer - 30 Apr 2008 22:07 GMT
> Hi!
>
[quoted text clipped - 3 lines]
>  ...
>  }

how about:

public class Foo<Bar extends Something> {

Note that this works if `Something' is a class or if it is an interface.
Signature

Beware of bugs in the above code; I have only proved it correct, not
tried it. -- Donald E. Knuth



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