docs/bugpattern/GetClassOnEnum.md

Enum values that declare methods are a subclass of the actual enum type, so
calling `getClass()` returns a synthetic subclass of the enum. To retrieve the
type of the enum, use `getDeclaringClass()`.

In the following example, `Binop.MULT.getClass()` returns the anonymous class
`Binop$2`, while `Binop.MULT.getDeclaringClass()` returns the class `Binop`.

```java
enum Binop {
  MULT {
    @Override
    int apply(int x) {
      return x * x;
    }
  },
  ADD {
    @Override
    int apply(int x) {
      return x + x;
    }
  };

  abstract int apply(int x);
}
```

```java
public class Test {
  static void printEnumClass(Enum theEnum) {
    System.err.println(theEnum.getClass());
    System.err.println(theEnum.getDeclaringClass());
  }

  public static void main(String[] args) {
    printEnumClass(Binop.ADD);
  }
}
```

Prints:

```
class Binop$2
class Binop
```