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RE: Java: interface methods with same name and signatur e

• From: "Gregory M. Messner" <gmessner@b...>
• To: xml-dev <xml-dev@l...>
• Date: Fri, 26 Oct 2001 15:08:09 -0700

Ron,

If you take a look at section 9.4.2 Overloading in
ftp://ftp.javasoft.com/docs/specs/langspec-2.0.pdf you should find your
answer.

The way I read it is that it is OK to implement interfaces that have methods
with the same signature, the only thing is you can have only a single
implementation of the method. Basically, even if you cast on the interface
name it will end up calling the same method in the implementation.


Greg

-----Original Message-----
From: Ronald Bourret [mailto:rpbourret@r...]
Sent: Friday, October 26, 2001 2:34 PM
To: xml-dev
Subject:  Java: interface methods with same name and signature


Sorry about the non-XML topic...

Suppose I have two interfaces, both of which have a method with the same
name and the same signature. For example:

   public interface foo1 {public void foo()}
   public interface foo2 {public void foo()}

Now suppose I want a single object to implement both interfaces:

   public class fooimp implements foo1, foo2

Calling methods shouldn't be a problem, as I can cast:

   fooimp fi = new fooimp();
   (foo1)fi.foo();
   (foo2)fi.foo();

But what is the syntax for actually implementing the methods? This is
clearly a problem:

   public class fooimp implements foo1, foo2
   {
      public void foo() {...} // from foo1
      public void foo() {...} // from foo2
   }

I couldn't find anything in the Java spec...

Thanks,

-- Ron

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