Writing concurrent programs in Java keeps getting easier, but writing concurrent programs that are correct and fast is as difficult as it ever was.

Collection or an appropriate subtype is generally the best return type for a public, sequence- returning method.

The cleaner and nicer the program, the faster it’s going to run. And if it doesn’t, it’ll be easy to make it fast.

It is hard to write even the smallest piece of code correctly.

When you choose a language, you’re choosing more than a set of technical trade-offs-you’re choosing a community.

When in doubt, leave it out.

Builder pattern is more verbose than the telescoping constructor pattern, so it should be used only if there are enough parameters, say, four or more.

A second advantage of static factory methods is that, unlike constructors, they are not required to create a new object each time they're invoked.

One advantage of static factory methods is that, unlike constructors, they have names.

Learning the art of programming, like most other disciplines, consists of first learning the rules and then learning when to break them.