Mailing-List: contact harmony-dev-help@incubator.apache.org; run by ezmlm
Precedence: bulk
Reply-To: harmony-dev@incubator.apache.org
Received-SPF: neutral (asf.osuosl.org: 202.81.18.152 is neither permitted nor
 denied by domain of richard.liangyx@gmail.com)
Message-ID: <44AD1599.908@gmail.com>
Date: Thu, 06 Jul 2006 21:52:25 +0800
From: Richard Liang <richard.liangyx@gmail.com>
User-Agent: Thunderbird 1.5.0.4 (Windows/20060516)
MIME-Version: 1.0
To: harmony-dev@incubator.apache.org
Subject: Re: [classlib] Exception throwing compatibility: java.util.Scanner
References: <44AD076F.1040708@gmail.com> <44AD13A9.8050109@gmail.com>
In-Reply-To: <44AD13A9.8050109@gmail.com>
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=ISO-8859-1; format=flowed


Paulex Yang wrote:
> Richard Liang wrote:
>> Hello All,
>>
>> When I'm trying to implement Scanner.nextInt(int radix), I met a 
>> problem.
>>
>> As we all know, Character.MIN_RADIX equals 2 and Character.MAX_RADIX 
>> equals 36, so the parameter radix can not less than 2 or greater than 
>> 36, Otherwise that parameter is illegal.
>>
>> But on RI, when the parameter radix is illegal, there are different 
>> kinds of Exception thrown.
>>
>>    * If the parameter is less than 0 or greater than 36, RI throws a
>>      StringIndexOutOfBoundsException. Obviously this exception depends
>>      an RI's implementation.
>>    * If the parameter equals 1, RI throws an InputMismatchException
>>      with an additional information "The radix 1 is less than the
>>      Character.MIN_RADIX".
>>    * If the parameter equals 0, RI throws a
>>      java.util.regex.PatternSyntaxException whose constructor has three
>>      parameters. And the parameters depends on RI's implementation,
>>      that makes me can not follow RI.
> Is this exception thrown by RegEx class? Should we identify at first 
> if our regular expression has different behavior with RI on some 
> certain input parameter?
Hello Paulex,

Yes, this exception is thrown by regex, but it depends on RI's 
implementation. I don't know how to get the "input parameter", any comments?

Richard
>>
>> And nothing is documented in the spec. Shall I follow RI's behavior? 
>> Thanks a lot.
>>
>> Here is the test case to demo this issue.
>>
>> public void test_nextIntI(){
>>       Scanner s = new Scanner("123 456");
>>
>>       try {
>>            s.nextInt(-1);
>>            fail("Should throw StringIndexOutOfBoundsException");
>>        } catch (StringIndexOutOfBoundsException e) {
>>            // Expected
>>        }
>>        try {
>>            s.nextInt(0);
>>            fail("Should throw PatternSyntaxException");
>>        } catch (PatternSyntaxException e) {
>>            // Expected
>>        }
>>        try {
>>            s.nextInt(1);
>>            fail("Should throw InputMismatchException");
>>        } catch (InputMismatchException e) {
>>            // Expected
>>        }
>>        try {
>>            s.nextInt(40);
>>            fail("Should throw StringIndexOutOfBoundsException");
>>        } catch (StringIndexOutOfBoundsException e) {
>>            // Expected
>>        }
>> }
>>
>
>

-- 
Richard Liang
China Software Development Lab, IBM 


---------------------------------------------------------------------
Terms of use : http://incubator.apache.org/harmony/mailing.html
To unsubscribe, e-mail: harmony-dev-unsubscribe@incubator.apache.org
For additional commands, e-mail: harmony-dev-help@incubator.apache.org