Javaの列挙型がジェネリクスをサポートし、個々の項目にメソッドを追加する機能が追加された。これは新たなJEPで公開されている。どちらの機能 ...

Most new Java developers quickly learn that they should generally compare Java Strings using String.equals(Object) rather than using == . This is emphasized and reinforced to new developers ...

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 ...

Second, these are Java enums, they can and should have methods on them. When I was working with such mechanisms, we duplicated things like the ids of enums in both the database and the code.