Java API: Passing a collection as generic varargs

[zhangwen0411]

I have a FuncDecl and want to apply it to some arguments stored in an ArrayList<Expr<?>>. The signature of FuncDecl.apply looks like:

public Expr<R> apply(Expr<?> ... args)

but Java doesn't allow me to create an Expr<?>[] from my ArrayList<Expr<?>>. I could create an Expr[], but then the Java compiler warns me about "Raw use of parameterized class 'Expr'".

Is there a good way to call apply on a collection of expressions?

[wintersteiger]

I haven't touched an Java stuff in a while, buy what about ArrayList::toArray()?

[zhangwen0411]

Yes! I was able to do:

Expr<?>[] args = arrayList.toArray(new Expr[0]);

and then write funcDecl.apply(args) without the compiler complaining. Thank you!