type-annotations on lambda expressions, not sure what to expect

[Werner Dietl]

Hi Steve,

type annotations in and on lambda expressions were first specified in
the JSR 308 spec sent out by Mike on Wednesday.
I will try to implement that spec ASAP; I will have a better
understanding early next week.

cu, WMD.

On Fri, Jan 25, 2013 at 6:07 PM, Steve Sides <steve.sides at oracle.com> wrote:
> Hi,
> I'm looking at type-annotations on lambda expressions. This little sample
> below compiles, but there are no type-annotations in the class file, and I'm
> not really sure what to expect.
> Any answers yet?
>
> -steve
>
> import java.lang.annotation.*;
> import static java.lang.annotation.RetentionPolicy.*;
> import static java.lang.annotation.ElementType.*;
>
> public class test {
>     // type-annotations do not appear in class files.
>     IntOperation dubble = (@A Integer I) -> I * 2;
>     PrintString  PS = (@A String msg) -> System.out.println(msg);
>     PrintString Debug = (@A String msg) -> { @A @A String dbg="DEBUG:";
>                                              dbg=dbg.concat(msg);
>                                              System.out.println(dbg); };
>                                            }
>     // SAM interfaces
>     interface IntOperation  { Integer operate(Integer i); }
>     interface PrintString   { void    print(String s); }
>     interface IntOperations { intOps  getIntOps( ); }
>
>     @Retention(RUNTIME)
>     @Target({TYPE_USE})
>     @Repeatable( AC.class)
>     @interface A {}
>
>     @Retention(RUNTIME)
>     @Target({TYPE_USE})
>     @interface AC { A[] value(); }
> }
>
>
>
>



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