question on type annotations in lambda expression

[Steve Sides]

As a note, if i put the same annotations on the getString() methods, I 
see 4(2+2) in both T14$1inner and T14l$1inner, so it's just on fields.

-steve

On 3/6/2013 11:39 AM, Steve Sides wrote:
> Hi Werner,
> I have a question on type annotations in lambda expressions.
> Are these not analogous in their annotations? One is a local class and 
> another a local class in a lambda expression.
> Only the type-annotations show up in the lambda expression.
>
> In T14$1inner there are 2 TypeAnnotations and 2 Annotations.
>   java.lang.Class<?> icc;
>     descriptor: Ljava/lang/Class;
>     flags:
>     Signature: #10                          // Ljava/lang/Class<*>;
>     RuntimeVisibleAnnotations:
>       0: #12()
>       1: #13()
>     RuntimeVisibleTypeAnnotations:
>       0: #12(): FIELD
>       1: #13(): FIELD
>
> In T14l$1inner(lambda expression) there are 2 TypeAnnotations and 0 
> Annotations.
>   java.lang.Class icc;
>     descriptor: Ljava/lang/Class;
>     flags:
>     RuntimeVisibleTypeAnnotations:
>       0: #10(): FIELD
>       1: #11(): FIELD
>
> source:
>
> import java.lang.annotation.*;
> import static java.lang.annotation.RetentionPolicy.*;
> import static java.lang.annotation.ElementType.*;
> import java.util.List;
> import java.util.ArrayList;
>
> class T14{
>     void test() {
>           class innerClass   {
>               @A @B Class<?> icc; //2 Ann, 2 TypeAnn
>               innerClass(Class<?> _c) { icc = _c; } //2 TypeAnn
>               String getString() { return icc.toString(); } //2 
> Ann,2TypeAnn
>           }
>          String s = new innerClass(T14.class).getString();
>          System.out.println(s);
>     }
> }
>
> //Source2:
> class T14l{
>     interface MapFun<T, R> {  R m( T n); }
>     MapFun<Class<?>,String> cs;
>
>     void test() {
>         cs = c -> {
>                  class innerClass   {
>                      @A @B Class<?> icc; //2 Ann, 2 TypeAnn
>                      innerClass(Class<?> _c) { icc = _c; } //2 TypeAnn
>                      String getString() { return icc.toString(); } //2 
> Ann,2TypeAnn
>                  }
>                  return new innerClass(c).getString();
>         };
>         System.out.println("cs.m : " + cs.m(Integer.class));
>     }
> }
>
> // annotations
> @Retention(RUNTIME) 
> @Target({TYPE_USE,TYPE,FIELD,METHOD,PARAMETER,CONSTRUCTOR,LOCAL_VARIABLE,ANNOTATION_TYPE,PACKAGE}) 
> @Repeatable( AC.class ) @interface A { }
> @Retention(RUNTIME) 
> @Target({TYPE_USE,TYPE,FIELD,METHOD,PARAMETER,CONSTRUCTOR,LOCAL_VARIABLE,ANNOTATION_TYPE,PACKAGE}) 
> @interface AC { A[] value(); }
> @Retention(RUNTIME) 
> @Target({TYPE_USE,TYPE,FIELD,METHOD,PARAMETER,CONSTRUCTOR,LOCAL_VARIABLE,ANNOTATION_TYPE,PACKAGE}) 
> @Repeatable( BC.class ) @interface B { }
> @Retention(RUNTIME) 
> @Target({TYPE_USE,TYPE,FIELD,METHOD,PARAMETER,CONSTRUCTOR,LOCAL_VARIABLE,ANNOTATION_TYPE,PACKAGE}) 
> @interface BC { B[] value(); }
>
>

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