Re: @Override

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <>
Tue, 24 Jul 2012 21:35:01 -0400
On 7/23/2012 11:47 PM, Eric Sosman wrote:

On 7/23/2012 10:57 PM, Arne Vajh?j wrote:

On 7/23/2012 10:16 PM, Eric Sosman wrote:

On 7/23/2012 7:58 PM, Arne Vajh?j wrote:

And all arguments seems related to extends not implements, so
I m not convinced that extending it to interface methods was

    A separate @Implements annotation instead of @Override might
have been better for interfaces. But what should one do about
abstract methods in abstract superclasses? Are those @Override
or @Implements, or maybe @Concretizes? And why should the class
with the actual implementation care about the distinction? And
what about concrete methods *intended* to be overridden, as in
MouseAdapter? @ProFormaOverrides?

     Looks like fodder for a "whichness of the why" debate.

I think abstract methods should be treated like other methods in

The abstract class could later introduce an implementation.

We know that the interface will never.

     Ah, but what about

     abstract class Super implements ActionListener {
         protected void helperMethod() { ... }
         ... // maybe an actionPerformed() here, maybe not

     class NowWhat extends Super {
         @WhatAnnotationGoesHere // ?
         public void actionPerformed(ActionEvent evt) {

In the NowWhat class, does actionPerformed() "implement" the
method required by the ActionListener interface, or does it
"concretize" the abstract actionPerformed() method of the Super
class? Or does it "override" Super's concrete actionPerformed()
method (not shown)? What if Super explicitly declares an abstract
actionPerformed() method?

I would tend to use the extend way here because Super
could implement the method.

     More to the point, is the distinction useful? No, let's
"concretize" that question: Can you suggest a scenario in which
it would be helpful to distinguish among different flavors of

     - Implement a method of an interface the class `implements'

     - Implement a method of a superinterface of an interface
       the class `implements'

     - Implement a method of an interface an abstract superclass
       `implements' but leaves abstract

     - Implement a method explicitly declared as abstract by an
       abstract superclass

     - Replace a superclass' concrete implementation

At the risk of dating myself (again), where's the beef?

The beef is that it is not needed if it is known to be
an implements interface.


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