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Re: Forward references

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  Re: Forward references Arne Vajhøj <arne@vajhoej.dk> - 2016-10-02 19:59 -0400

#35695 — Re: Forward references

On 10/2/2016 11:45 AM, Stefan Ram wrote:
>   An old C compiler from the 70s is a one-pass compiler IIRC,
>   so it does not do "forward references".
>
>   I am used so much to this, that I actually was not sure
>   whether in Java the following program is correct:
>
> class A implements B {}
>
> interface B {}

>   In the first line, we use an interface that will be
>   define only later!
>
>   Turns out, Java accepts this.

I am not surprised.

javac take a sort of global approach to compilation.

And I am pretty sure that you have written code where
A refer to B and B refer to A. And it worked fine
without any special declarations.

Arne

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