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From: =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne@vajhoej.dk>
Newsgroups: comp.lang.java.programmer
Subject: Re: [OT] Re: missing import java.lang.Comparable
Date: Fri, 8 Jul 2016 20:32:01 -0400
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On 7/8/2016 3:54 PM, Eric Douglas wrote:
> On Friday, July 8, 2016 at 2:07:28 PM UTC-4, Andreas Leitgeb wrote:
>>> Program:
>>>           double a = .0002;
>>>           double b = .0001;
>>>           System.out.println(a + b);
>>> Result:
>>> 3.0000000000000003E-4
>>
>> That's why formatted printing (e.g. printf) is preferable to
>> the default stringification of floating point values in such
>> cases.
>
> Program:
>     DecimalFormat myFormatter = new DecimalFormat("0.####################");
>     String output;
>     double a = .0002;
>     double b = .0001;
>     output = myFormatter.format(a + b);
>     System.out.println(output);
>     BigDecimal bda = new BigDecimal(String.valueOf(a));
>     BigDecimal bdb = new BigDecimal(String.valueOf(b));
>     bda = bda.add(bdb);
>     output = myFormatter.format(bda.doubleValue());
>     System.out.println(output);
> Output:
> 0.00030000000000000003
> 0.0003

I don't think this example shows what you think it shows.

It really shows that String.valueOf has an impact on the result.

Arne