Gerade auf http://java.sun.com/j2se/javadoc/writingdoccomments/ gelesen:
Good programming practice dictates that code should never make use of default constructors in public APIs: All constructors should be explicit. That is, all default constructors in public and protected classes should be turned into explicit constructor declarations with the appropriate access modifier. This explicit declaration also gives you a place to write documentation comments.
Klingt vernünftig und wird daher hier festgehalten. 
