見て分かる通り、宣言に利用されているキーワードは enum で、class ではない。 つまり、Enum はクラスではない。 ように見えるが、Java の内部的には enum は、抽象クラス Enum を継承（extends）したクラスである。

The enum keyword was introduced in Java 5. It denotes a special type of class that always extends the java.lang.Enum class. Java enum, also called Java enumeration type, is a type whose fields consist ...

When I was writing code regularly in both C++ and Java in the early days of Java, I often missed Java’s (at the time) lack of an enum. Fortunately, when Java finally got its enum, it was worth the ...

Community driven content discussing all aspects of software development from DevOps to design patterns. The Java enum, introduced in Java 5, will map to the underlying database without any ...

Although it is part of the java.util.concurrent package, the TimeUnit enum is useful in many contexts outside of concurrency. In this post, I look at how the TimeUnit enum can be used even in code ...