Re "data classes" example in this article - Common Lisp features I miss most in Java (besides macros):

- multiple return values - basically doing what the author is doing here, without introducing a new class for it,

- destructuring - assigning pieces of composite object into several variables (see e.g. destructuring-bind, or what pattern matching does in many languages).

Basically, I often find myself wanting to write this:

  return {listWithResults, someBooleanFlag};

or

  return {listWithOneGroup, listWithOtherGroup};

and then use it like this:

  List<Foo> matchingResults;
  List<Foo> nonMatchingResults;
  boolean flag;

  {matchingResults, nonMatchingResults, flag} = functionReturningMultipleValues();

or:

  Foo first;
  Foo third;
  List<Foo> rest;
  {first, _, third | rest} = someList;

etc.