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

The Java enum is a powerful feature of the language that allows one to elegantly represent finite values and to provide convenient access to characteristics of those finite values.

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 ...

dumb_enum_warn.c:21: warning: comparison of unsigned expression >= 0 is always true The problem is that I don't know that it's going to signed or unsigned, that's up to the compiler.