Loosen Constructor super()/this() call restrictions

[Mark Mahieu]

Marek,

Other than being able to give a name to your 'initializers', I'm not sure
what you're gaining with that compared to what's already supported, eg:
class Foo {

    private final int i;

    public Foo() {
        this(42);
    }

    private Foo(int j) {
        i = j;
    }
}


Regards,

Mark


2009/3/23 Marek Kozieł <develop4lasu at gmail.com>

> 2009/3/23 Mark Mahieu <markmahieu at googlemail.com>:
> > 2009/3/23 Jeremy Manson <jeremy.manson at gmail.com>
> >>
> >> For example, now that this() and super() can come in the middle of a
> >> constructor, are the semantics implicitly changed so that you can
> >> catch exceptions thrown by this() and super()?  Does that mean that
> >> objects can now be seen as partially initialized in sub-constructors?
> >>
> >
> > Ha, there's a bug entry for that one too:
> > http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4879515
> >
> > Mark
> >
> >
>
> this() super() work 100% correctly now days.
>
> But maybe the thing you need is not this 'weird' behavior of constructor.
>
> Consider new kind of method 'initializer':
>  - Can be executed only in constructors.
>  - Can assign value to final fields, only condition is to assign it always.
>
>
>
> class Sample{
>   final Foo foo;
>   final Bar bar;
>
>   public Sample(FooBuilder foo, Bar bar){
>      initFoo(foo); // compiler known that foo is assigned
>      this.bar = bar.copy();
>   }
>
>   public Sample(FooBuilder foo, BarBuilder bar){
>      initFoo(foo); // compiler known that foo is assigned
>      initBar(bar); // compiler know that bar is assigned
>   }
>
>   public Sample(Foo foo, BarBuilder bar){
>      this.foo = foo.copy();
>      initBar(bar); // compiler know that bar is assigned
>   }
>
>   initializer void initFoo(FooBuilder foo){
>      //operations to create foo
>      // we have foo
>      this.foo = foo;
>   }
>
>   initializer void initBar(BarBuilder bar){
>      //operations to create  bar
>      // we have  bar
>      this. bar = bar;
>   }
>
> }
>
>
>
> --
> Pozdrowionka. / Regards.
> Lasu aka Marek Kozieł
>
> http://lasu2string.blogspot.com/
>