codesmell.org

until now i withstood the forbidden fruit of spending time with scala. until this morning i just pushed this until Jan´s book was delivered

but really, after i just had a first glance of it…. how could this be not interesting?

 Java | 
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object E {
  def main(args : Array[String]) : Unit = {
    new Foo().foo;
    (new Foo() with Bar).bar;
    (new Foo() with InterceptingFoo).foo;
  }
}
 
trait IFoo {
 def foo();
}
 
class Foo {
 def foo() { System.out.println("foo") }
}
 
trait Bar {
 def bar() { System.out.println("bar") }
}
 
trait InterceptingFoo extends IFoo {
 abstract override def foo() {
  System.out.println("before foo");
  super.foo();
  System.out.println("after foo");
 }
}

note that all of this magic is done at runtime! there is no class (well generated, but not written) that combines Foo and InterceptingFoo for instance.

NEAT!

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output:
foo
bar
before foo
foo
after foo