Get enum value from enum type and ordinal

Question

public  E decode(java.lang.reflect.Field field, int ordinal) {
    // TODO
}

Assumin

Answer 1

ExampleTypeEnum value = ExampleTypeEnum.values()[ordinal]

Answer 2

According to title, suggest

public <E extends Enum> E decode(Class<?> enumType, int ordinal) 
{
   return enumType.getEnumConstants()[ordinal];
}

to be called by

YourEnum enumVal = decode(YourEnum.class, ordinal)

Answer 3

To get what you want you need to invoke YourEnum.values()[ordinal]. You can do it with reflection like this:

public static <E extends Enum<E>> E decode(Field field, int ordinal) {
    try {
        Class<?> myEnum = field.getType();
        Method valuesMethod = myEnum.getMethod("values");
        Object arrayWithEnumValies = valuesMethod.invoke(myEnum);
        return (E) Array.get(arrayWithEnumValies, ordinal);
    } catch (NoSuchMethodException | SecurityException
            | IllegalAccessException | IllegalArgumentException
            | InvocationTargetException e) {
        e.printStackTrace();
    }
    return null;
}

UPDATE

As @LouisWasserman pointed in his comment there is much simpler way

public static <E extends Enum<E>> E decode(Field field, int ordinal) {
    return (E) field.getType().getEnumConstants()[ordinal];
}

Answer 4

field.getType().getEnumConstants()[ordinal]

suffices. One line; straightforward enough.