Name: igT44549 Date: 02/08/99


My understanding is that the following program is legal:

interface InterfaceField
{
    Object o = new Object()
    {
    };
}

The anonymous class instance creation implicitly defines a static member class of the enclosing interface.

Both Jikes and Visual J++ accept the above program, but javac rejects it.

Please confirm.

thanks.
(Review ID: 53448)
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Name: tb29552 Date: 05/08/99


/*
Code will not compile. The error message is:

% javac GetVals.java
GetVals.java:18: The type nested type GetVals. 1 can't be static. Static members can only occur in interfaces and top-level classes.
  public static GetVals SAME = new GetVals() {
                                    ^
GetVals.java:18: Interface fields can't be private or protected: nested type GetVals. 1
  public static GetVals SAME = new GetVals() {
                                    ^
2 errors


*/
public interface GetVals {

  public Object getVal(String arg) ;

  public static GetVals SAME = new GetVals() {
    public Object getVal(String s){
      return s;
    }
  } ;
}
/*
-----------------------------------------------
in fact GetVals.$1 IS INTENDED to be a static class
this obliges us to do things such as :

-------------------------------------------------
public interface GetVls {

   public Object getVal(String arg) ;

   public static class getVls_1 implements GetVls{
      public Object getVal(String s){
         return s;
      }
   }
   public static GetVls SAME= new getVls_1() ;

}
----------------------------------------------
OR

---------------------------------------------
public interface GetVals {
   public Object getVal(String arg) ;

   public static GetVals SAME = Vals.same() ;
}

--------
public class Vals {
   public static GetVals same(){
      return new GetVals() {
      public Object getVal(String s){
         return s;}
      } ;
   }
}


---------------------------------------------

*/

(Review ID: 57993)
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Name: krT82822 Date: 09/20/99


Apparently javac does not support anonymous classes nested directly inside interfaces.
Sample source:
------------------------------------------->
interface Foo {
    int bar = (new Object() {} ).hashCode();
}
<-------------------------------------------


JDK 1.2.2 javac output on above:
------------------------------------------->
Foo.java:2: The type nested type Foo. 1 can't be static. Static members can only occur in interfaces and top-level classes.
    int bar = (new Object() {} ).hashCode();
                   ^
Foo.java:2: Interface fields can't be private or protected: nested type Foo. 1
    int bar = (new Object() {} ).hashCode();
                   ^
2 errors
<-------------------------------------------

Jikes 1.02 and Pizza v0.39g successfuly compile the above source.

Anonymous classes nested directly in interfaces are by definition top-level (i.e., not inner). As far as I can tell this is neither acknowledged nor forbidden by the nner Classes
Specification. There doesn't seem to be any reason to disallow it.
(Review ID: 95371)
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