Quotes About Joshua Bloch

You can put any element into a collection with a raw type, easily corrupting the collection's type invariant (as demonstrated by the unsafeAdd method on page 119); you can't put any ele- ment (other than null) into a Collection>.

A forEach operation that does anything more than present the result of the computation performed by a stream is a "bad smell in code," as is a lambda that mutates state.

Given the difficulty of using wait and notify correctly, you should use the higher-level concurrency utilities instead.