That won't compile, but if I fix the obvious problems then you're left
with a change to which things happen. When you do new Y(3) in the
original, X's constructor that takes an int will be called. An
alteration to make this clear follows, but I am trying to point out a
difference that makes converting from (poor) Java to Scala difficult.
class X {
public int count;
public X(int x) {
count = 2;
}
public X(float x) {
count = 3;
}
}
class Y extends X {
public Y(int x) {
super(x * 2);
}
public Y(float x) {
super(x * 2);
}
}
class YTest {
public void testY() {
assert new Y(0.5F).count == 3 && new Y(5).count == 2;
}
}
Ricky.
--
Ricky Clarkson
Java and Scala Programmer, AD Holdings
+44 1928 706373
Skype: ricky_clarkson
On Fri, Sep 10, 2010 at 12:11 PM, Kevin Wright <[email protected]> wrote:
> easy! It does absolutely nothing, so the obvious improvement in both
> languages is not to write it at all...
> But if you absolutely must keep the interface (mocking perhaps?) then:
> class X(x: Float) {
> def this(x2: Int) = this(x2)
> }
> class Y(y: Float) extends X(y) {
> def this(y2: Int) = this(y2)
> }
>
> On 10 September 2010 12:01, Ricky Clarkson <[email protected]> wrote:
>>
>> class X {
>> public X(int x) {
>> }
>>
>> public X(float x) {
>> }
>> }
>>
>> class Y extends X {
>> public Y(int x) {
>> super(x * 2);
>> }
>>
>> public Y(float x) {
>> super(x * 2);
>> }
>> }
>>
>> Ricky.
>>
>> --
>> Ricky Clarkson
>> Java and Scala Programmer, AD Holdings
>> +44 1928 706373
>> Skype: ricky_clarkson
>>
>>
>>
>> On Fri, Sep 10, 2010 at 11:57 AM, Kevin Wright <[email protected]>
>> wrote:
>> > I'll throw down the gauntlet then...
>> > Can anyone provide an example of Java code that's can't be improved by
>> > writing it in Scala
>> > Or Scala code that can be improved by writing it in Java (but can't be
>> > improved by just rewriting within Scala)
>> > By "improve", I mean that the code is better with regards to one (or
>> > more)
>> > of the following:
>> > - readability (how quickly can another developer, familiar with the
>> > language, understand the code)
>> > - maintainability (how much work is involved in a simple refactoring)
>> > - thread safety
>> > But doesn't sacrifice any of the above qualities.
>> >
>> >
>> > On 10 September 2010 11:45, Steven Herod <[email protected]> wrote:
>> >>
>> >> This thread would be a lot better, faster and easier to read and reply
>> >> to if it were written in Scala.
>> >>
>> >> On Sep 10, 8:42 pm, Ricky Clarkson <[email protected]> wrote:
>> >> > Ok, conspiracy theory time!
>> >> >
>> >> > Reinier, the initiator of this thread, works on Project Lombok, which
>> >> > uses annotation processing to add language features to Java.
>> >> > Therefore, isn't it in his interest to discourage uptake of Scala and
>> >> > Clojure? Could he be trying to assert that all Scala users are
>> >> > fanboys to try to discourage associating oneself with Scala?
>> >> >
>> >> > Of course, I jest.
>> >> >
>> >> > Ricky.
>> >> >
>> >> > --
>> >> > Ricky Clarkson
>> >> > Java Programmer and Scala Fanboi, AD Holdings
>> >> > +44 1928 706373
>> >> > Skype: ricky_clarkson
>> >> >
>> >> >
>> >> >
>> >> > On Fri, Sep 10, 2010 at 11:28 AM, Wildam Martin <[email protected]>
>> >> > wrote:
>> >> > > On Fri, Sep 10, 2010 at 10:44, Kevin Wright
>> >> > > <[email protected]>
>> >> > > wrote:
>> >> > >> But given the resistance I'm seeing to even small differences
>> >> > >> between
>> >> > >> Java/Scala syntax, I suspect that Clojure will be far too radical
>> >> > >> for
>> >> > >> most
>> >> > >> institutionalised Java developers.
>> >> >
>> >> > > Somehow this sounds as Java developers are considered as not being
>> >> > > very flexible - all the Scala and Clojure or whatever else
>> >> > > JVM-language programmers should remember, that most of them
>> >> > > probably
>> >> > > have been Java developers also for quite a long time.
>> >> >
>> >> > > Anyway, if it continues that way (if you need to address each
>> >> > > single
>> >> > > language-fan-boy begging for not turning a thread into trash) I
>> >> > > will
>> >> > > somewhat stop following the javaposse google group.
>> >> > > --
>> >> > > Martin Wildam
>> >> >
>> >> > >http://www.google.com/profiles/mwildam
>> >> >
>> >> > > --
>> >> > > You received this message because you are subscribed to the Google
>> >> > > Groups "The Java Posse" group.
>> >> > > To post to this group, send email to [email protected].
>> >> > > To unsubscribe from this group, send email to
>> >> > > [email protected].
>> >> > > For more options, visit this group
>> >> > > athttp://groups.google.com/group/javaposse?hl=en.
>> >>
>> >> --
>> >> You received this message because you are subscribed to the Google
>> >> Groups
>> >> "The Java Posse" group.
>> >> To post to this group, send email to [email protected].
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>> >>
>> >
>> >
>> >
>> > --
>> > Kevin Wright
>> >
>> > mail / gtalk / msn : [email protected]
>> > pulse / skype: kev.lee.wright
>> > twitter: @thecoda
>> >
>> > --
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>> >
>>
>> --
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>>
>
>
>
> --
> Kevin Wright
>
> mail / gtalk / msn : [email protected]
> pulse / skype: kev.lee.wright
> twitter: @thecoda
>
> --
> You received this message because you are subscribed to the Google Groups
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> To post to this group, send email to [email protected].
> To unsubscribe from this group, send email to
> [email protected].
> For more options, visit this group at
> http://groups.google.com/group/javaposse?hl=en.
>
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