Every Java enumeration has a static values() method can be used like this
for (MyEnum enum : MyEnum.values()) {
// Do something with enum
}
However, I cannot figure out where this method is defined. There's no mention of it in the Javadoc and it doesn't appear anywhere in the source file.
This is required by the Java Language Specification: values
and valueOf
will be implicitly declared for all Enums:
/**
* Returns an array containing the constants of this enum
* type, in the order they're declared. This method may be
* used to iterate over the constants as follows:
*
* for(E c : E.values())
* System.out.println(c);
*
* @return an array containing the constants of this enum
* type, in the order they're declared
*/
public static E[] values();
/**
* Returns the enum constant of this type with the specified
* name.
* The string must match exactly an identifier used to declare
* an enum constant in this type. (Extraneous whitespace
* characters are not permitted.)
*
* @return the enum constant with the specified name
* @throws IllegalArgumentException if this enum type has no
* constant with the specified name
*/
public static E valueOf(String name);
These methods are added during compile time, so if you use javap
to disassemble the code, you can actually look at their body.
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