Comment by ptx

I'm surprised that Ousterhout doesn't point out the huge problem introduced with the PrimeGenerator3 refactor: It stores state in static (!) fields, so it's completely unusable in the presence of threads, unless you add a global lock.

Even if Uncle Bob thinks tiny methods are great, why would he introduce the pseudo-constructor "initializeTheGenerator" and make everything static if he needs state? If the helper methods were instance methods instead, the static "generateFirstNPrimes" method could simply construct a new instance to store the state.