Constructor declaration.

a constructor declaration consists of a set of fields to be initialized. For example, if a class is defined as:

Class: Foo
  Field: String a
  Field: int b
  Field: BigInteger c

Then a constructor declaration of {"a","c"} will conceptually generate the following consturctor:

Foo( String _a, BigInteger _c ) {
  a=_a; c=_c;
}

(Only conceptually, because Foo will likely to become an interface so we can't simply generate a constructor like this.)