多选题 Given:
2. import java.util.regex.*;
3. public class Decaf {
4. public static void main(String[] args)
5. Pattern p = Pattern.compile(args[0]);
6. Matcher m = p.matcher(args[1]);
7. while (m.find())
8. System.out.print(re.group() + " ");
9. } }
And the three command-line invocations:
Ⅰ. java Decaf "0([0-7])?" "1012 0208 430"
Ⅱ. java Decaf "0([0-7])*" "1012 0208 430"
Ⅲ. java Decaf "0([0-7])+" "1012 0208 430"
Which are true? (Choose all that apply.)

A、 All three invocations will return valid octal numbers.
B、 None of the invocations will return valid octal numbers.
C、 Only invocations Ⅱ and Ⅲ will return valid octal numbers.
D、 All three invocations will return the same set of valid octal numbers.
E、 Of those invocations that return only valid octal numbers, each invocation will return a different set of valid octal numbers.

【正确答案】 A、E

【答案解析】