In regular java, it's possible to do:
Code:

class Foo {
  int x;
  Foo(int _x){
    this.x = _x;
  }
  Foo(){
    this(5);
  }
} 

But I've noticed in Processing that this isn't working out correctly, saying something like "Unexpected '('". Am I doing it wrong, or is this just not possible at the moment?

[edit]
Well, that's strange, but somehow it seems to work now. I think I know why, too. I had something like
Code:

class C {
  C(){
    this("Blah");
  }
  C(String b){
    print(b);
  }
  otherMethod(){
    ...
  }
} 

So I think that since the "otherMethod()" didn't have void in front of it, it was throwing the interpreter off.

I like figuring things out!