Although it is part of the java.util.concurrent package, the TimeUnit enum is useful in many contexts outside of concurrency .

JPA and Hibernate enum mapping The Java enum, introduced in Java 5, will map to the underlying database without any intervention. The JPA framework, be it Hibernate or Toplink or DataNucleus, will ...

Published in early 1997, " Java Tip 27: Typesafe Constants in C++ and Java" discussed how to create and use typesafe constants (enums) in both Java and C++. Since then, various JavaWorld articles ...