Re: Cant a class extends a abstract class and implements a interface at once??

From:

Tim Hallwyl <hallwyl@diku.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 26 Sep 2006 18:35:39 +0200

Message-ID:

<vFcSg.52$x74.43@news.get2net.dk>

moxosyuri@gmail.com wrote:

public interface Shout
{ ...
  void Shout();
  ...
}

class abstract Person { ... }

class Worker externs Person implements Shout
{ ...
  public void Shout() { System.out.println(...);}
  ...
}

main
{ ...
Worker man = new Worker(...);
man.Shout();
...
}
// when compliing, the jcreater whill warning "Cant find sign!" and
//point at the line "man.Shout();"

and i find if dont use "extends (a abstract class)"
or just try "abstract class XXX implements XXX" are all OK.

Note: In your code samples above it is not an abstract class that
implements the interface.

There should not be a problem in both extending a class and implementing
an interface. Make sure that all abstract methods and methods in the
interface are implemented. In your sample Worker must implement all
abstract methods in Person (if any) and methods in Shout.

SO i suppose that MAYBE we cant use both of them at once in java...
Is that TRUE?? I DONT KNOW and wish someone can tell me what happened
in fact...

Why your compiler is complaining is difficult to say, not having the
exact code. But I hope this might give you a hint for the right direction.

--tim