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@SuppressWarnings({ "unchecked", "rawtypes" })
final class Example
{
    <E extends Enum<E>> Foo<E> createEnumFoo(Class enumType)
    {
        // This makes use of e.g. Enum.valueOf(enumType, ...).
        return Enum.valueOf(enumType, "x");
    }
 
    <T> Foo<T> createFoo(Class<T> type)
    {
        if (Enum.class.isAssignableFrom(type))
            return (Foo<T>) createEnumFoo(type);
        else
            // Here we would do something else or maybe throw an exception.
            return null;
    }
 
    interface Foo<T>
    {
    }
}

Main.java:7: error: incompatible types
        return Enum.valueOf(enumType, "x");
                           ^
  required: Foo<E>
  found:    Enum
  where E is a type-variable:
    E extends Enum<E> declared in method <E>createEnumFoo(Class)
1 error

Standard output is empty