class constructors in Xtend

Question

I'm trying out Xtend. Is it possible to make constructors? It seems so simple, but I'm getting an error when I try something like this:

class Scope extends Rect {

    public Scope(){
        super()
    }

}

Answer 1

Constructors are defined by overloading a new() method:

class MyClass extends AnotherClass {
  new(String s) {
    super(s)
  }

  new() {
    this("default")
  }
}

look here

Answer 2

The next release of Xtend is planned for mid December. It'll have support for declaring constructors.

See http://www.eclipse.org/Xtext/xtend/#whatsnext

Answer 3

Constructors are not yet supported in Xtend. The suggestion def Scope() is more a bug than a working constructor. You may want to follow this ticket.

Answer 4

There is no constructor support in Xtend 2.0. I think it is a show stopper.

"class Foo { def Foo() { /stuff/ } } declares a method Foo on instances of Foo with the inferred return type, not a constructor, as browsing the generated Java code will show.

This implies that there is no way to extend Java classes that lack default constructors. XTend does not complain; it happily generates Java that does not compile.

Nor does XTend support immutable (final) instance variables, naturally enough.