Interfaces

[Arsho, Ayan]

Hi All:
I am just trying to implement this statement in JLS

If the keyword this (�15.8.3) or the keyword super (15.11.2, 15.12) occurs in an initialization expression for a field of an interface, then unless the occurrence is within the body of an anonymous class (�15.9.5), a compile-time error occurs.

and my question is, can a anonymous class have a interface declarations and we can have a usage of 'this' and 'super' keywords.
If it doesn't make any sense, don't bother replying.

[Rajinder Yadav]

Arsho, the embodiment of one class having an anonymous inner class means that,
from inside the declaration of the "anonymous" inner class you are free to use the keywords
this and super.

Remember, that implementing an interface within a class means a "is a"
relationship. That means (in our case) the interface "is a" anonymous inner
class... they are one in the same!

So, using the this operator will result in accessing the class members, and
using super will result in accessing the parent's class members.

NOTE: all classes are implicitly subclasses of class Object, so the anonymous
inner class will have a superclass.
--
Rajinder Yadav
[ January 21, 2002: Message edited by: Rajinder Yadav ]

[Arsho, Ayan]

Good !! now Rajinder can u suffice the above with an example.
I tried and it blew up...
-Thanks

[R K Singh]

 
class Class020121{
static Thread t = new Thread(new Runnable(){
int i = 0;
int j = this.i; // No ERROR
public void run(){
System.out.println("occurrence is within the body of an anonymous class ,"+
" Here you can if want use super/this keyword");
System.out.println(this.i);
}
});
public static void main(String str[]){
t.start();
}
interface MyInterface{
int ii = 0;
//int jj = this.ii;    // compile time error
// can not use this/super here
}
} 

HTH
[ January 21, 2002: Message edited by: ravish kumar ]

[Paul Salerno]

interface MyInterface
{
   int ii = 0;
   //int jj = this.ii;   // compile time error
                         // can not use this/super                          //  here
}

I want to be sure that this will not compile because the nested interface is implicitly static therefore cant utilize this or super, correct me if Im wrong plz.