Using optional generics

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Mize-ze - 01 Mar 2007 10:23 GMT

Hello,

I am intrested in creating a generic class which leaves the use of
generics optional.
I want to use the generics when I want and leave it out when I want,
just like java.util.Map
How can I?

Example:
------------------------------------------------------------------------------------------------------

public class foo<T>{
private T value;
}

public static void main (String argv[]){

foo<Integer> = new foo<Integer>(); // That's ok
foo = new foo(); // Can't do this now!
how can I?
}
-----------------------------------------------------------------------------------------------------

Thanks

Reply to this Message

Hendrik Maryns - 01 Mar 2007 11:23 GMT

Mize-ze schreef:

> Hello,
>
[quoted text clipped - 10 lines]
> private T value;
> }

Please follow the naming conventions, especially if you post here:
public class Foo<T>

> public static void main (String argv[]){
>
> foo<Integer> = new foo<Integer>(); // That's ok

Are you sure?

> foo = new foo(); // Can't do this now!

Of course not, for the same reason as the line above.

> how can I?

Don’t forget to give your variables names.

> }
> -----------------------------------------------------------------------------------------------------
>
> Thanks

You’re welcome, H.
- --
Hendrik Maryns
http://tcl.sfs.uni-tuebingen.de/~hendrik/
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Ian Wilson - 01 Mar 2007 13:22 GMT

> Hello,
>
[quoted text clipped - 18 lines]
> }
> -----------------------------------------------------------------------------------------------------

Your example doesn't compile so I surmise it is retyped and contains
numerous typos. I've therefore no way to know what is wrong with your
real code.

public class Foo<T> {
private T var;
public static void main(String[] args) {
Foo<Integer> foo1 = new Foo<Integer>();
Foo foo2 = new Foo();
}
}

Compiles and runs here.

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Using optional generics

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