CODEWITHSUNDEEP
javanumber-formattingdecimalformat
Oskar Kjellin
Oskar Kjellin

Reputation: 21870

Parsing number with negative suffix

Can someone explain to me why the below code gives this output?

1.2
null

Running the following code:

String positive = "1.2+";
String negative = "1.2-";
DecimalFormat format = new DecimalFormat("0.0");
format.setPositiveSuffix("+");
format.setNegativeSuffix("-");  
format.setDecimalFormatSymbols(DecimalFormatSymbols.getInstance(Locale.US));
System.out.println(format.parse(positive, new ParsePosition(0)));
System.out.println(format.parse(negative, new ParsePosition(0)));

This works though, but I do not like the repetition of the pattern:

String positive = "1.2+";
String negative = "1.2-";
DecimalFormat format = new DecimalFormat("0.0+;0.0-");  
format.setDecimalFormatSymbols(DecimalFormatSymbols.getInstance(Locale.US));
System.out.println(format.parse(positive, new ParsePosition(0)));
System.out.println(format.parse(negative, new ParsePosition(0)));

Is the suffix not intended to be used for parsing?

Upvotes: 6

Views: 3210

Answers (1)

cporte
cporte

Reputation: 2191

As specified in the javadoc :

The negative subpattern is optional; if absent, then the positive subpattern prefixed with the localized minus sign ('-' in most locales)

In your exemple, the parser is waiting "-1.2-", so you have to add this line :

format.setNegativePrefix("");

Have a nice day !

Upvotes: 2

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