Where does the Enum.valueOf(String) method come from?

In Java SE 7 (and most probably in previous versions) the Enum class is declared like this:

 public abstract class Enum<E extends Enum<E>>
 extends Object
 implements Comparable<E>, Serializable

The Enum class has a static method with this signature:

  T static<T extends Enum<T>> valueOf(Class<T> enumType, String name) 

But there is no static method : valueOf(String) defined in the Enum class nor upwards in the hierarchy Enum belongs to.

The question is where does valueOf(String) come from ? Is it a feature of the language, i.e. a feature built in the compiler ?