Convert string to Float not so trivial

[Grzegorz Stasica]

Hi,

Of course this
new Float("123.56").floatValue()
code will convert to float but what about string like this "123,56".
Comma is used by many countries in Europe to separate fraction.
Please don't tell me that I've to use regular expressions to replace ,
to . in order to receive float value.

Rgs.
Greg

 

[Jon Skeet]

Of course this
new Float("123.56").floatValue()
code will convert to float but what about string like this "123,56".
Comma is used by many countries in Europe to separate fraction.
Please don't tell me that I've to use regular expressions to replace ,
to . in order to receive float value.

Use NumberFormat.parse instead, where you've created an instance of
NumberFormat which uses the appropriate Locale.

 

[Michael Borgwardt]

Of course this
new Float("123.56").floatValue()
code will convert to float

And unnecessarily creates a throwaway object. Use Float.parseFloat() instead.

but what about string like this "123,56".
Comma is used by many countries in Europe to separate fraction.
Please don't tell me that I've to use regular expressions to replace ,
to . in order to receive float value.

java.text.DecimalFormat.parse()

 

[VisionSet]

Hi,

Of course this
new Float("123.56").floatValue()
code will convert to float but what about string like this "123,56".
Comma is used by many countries in Europe to separate fraction.
Please don't tell me that I've to use regular expressions to replace ,
to . in order to receive float value.

DecimalFormatSymbols sym = new DecimalFormatSymbols();
sym.setDecimalSeparator(',');
DecimalFormat form = new DecimalFormat("");
form.setDecimalFormatSymbols(sym);
Number num = form.parse("123,456");
float f = num.floatValue();
System.out.println(f);

There is probably an appropriate locale option in there somewhere to.