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

The first reason I generally prefer == when comparing enums is a consequence of how the Java Language Specification describes enums. Section 8.9 (“Enums”) states: ...

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 ...