Ask for review: java.io.Ouputs

[Xueming Shen]

Alan Bateman wrote:
>
>>
>> (2)Is it really necessary to check "Charset.isSupproted()"? The csn 
>> will be checked when the
>> Charset is created later anyway, why do lookup twice. Yes, understood 
>> it can catch the problem
>> 1-2 step(s) earlier, I double you want to pay that price.
> All parameters need to be checked before the file is created (or 
> truncated).

Did not consider that:-) an alternative is to get the encoder first then 
the file creation.