I have a problem with parsing decimal number in Linux environment. When I parse in Windows, everything's all right.
Below, code snippet
String price;
DecimalFormat FORMATTER = (DecimalFormat)DecimalFormat.getInstance();
double customPrice = FORMATTER.parse(price).doubleValue();
And results
When price='9' Then customPrice='9.0' - it is ok
When price='1,00' Then customPrice='100.0' - it is wrong
When price='25,00' Then customPrice='2500.0' - it is wrong
Can you tell me what the problem is ?
Thanks
Read here here about locales, probably you're using en_US which causes the ',' symbol to separate groups of thousands.
you can use also
DecimalFormatSymbols unusualSymbols = new DecimalFormatSymbols(currentLocale);
unusualSymbols.setDecimalSeparator(',');
DecimalFormat weirdFormatter = new DecimalFormat(strange, unusualSymbols);
weirdFormatter.setGroupingSize(4);
to state your own sepeartors
You can change the decimal separator of DecimalFormat. The easiest way by using a NumberFormat with the desired locale, e.g.:
NumberFormat FORMATTER = NumberFormat.getNumberInstance(Locale.GERMAN);
double customPrice = FORMATTER.parse(price).doubleValue();
Related
I want to display some coördinates in my Android app.
I receive two double values (lat and long in decimal degrees notation) from my backend.
Example data:
var lat : Double = 52.5027
var long : Double = 5.41982
Now i fill my textView in my class file:
tvLat.text = getString(R.string.gps_format, lat)
tvLong.text = getString(R.string.gps_format, lat)
and my xml resource file contains this:
<string name="gps_format">%,.5f°</string>
It displays:
52,50270°
5,41982°
As I live in the Netherlands it is formatted accordingly.
See https://developer.android.com/reference/java/util/Formatter
Number Localization Algorithm
...
If a decimal separator is present, a locale-specific decimal separator is substituted.
We typically use a , as a decimal separator, and . as a group separator in the Netherlands.
Question:
Is there an international standard for the notation of coördinates in decimal degrees which requires the decimal seperator to be .?
If there is, or I just want to, how do I achieve this without changing my locale or formatting for the entire app?
Desired output:
52.50270°
5.41982°
I have not found a way yet for the XML, so my guess is that it will have to be done with code. I've looked into the setDecimalSeparator method, but I can't get any working solution.
I've found something which could be called a dirty solution.
tvLat.text =
getString(R.string.gps_format,
DecimalFormat(
"0.00000",
DecimalFormatSymbols(Locale.getDefault())
.apply { decimalSeparator = '.' }
).format(lat).toString()
)
Along with a change in my resource file
<string name="gps_format">%s°</string>
New output:
52.50270°
5.41982°
I would like to have the format in my string resource though.
Anyone has suggestions?
I have a legacy program (java 1.4) running under Tomcat/Jboss, however, i have copy it to a new server (java 1.7) and it throws the following exception.
java.lang.NumberFormatException: For input string: "0000000000000000009011,00"
sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1250)
java.lang.Double.valueOf(Double.java:504)
java.lang.Double.<init>(Double.java:597)
Since i don't have access to the source, is there any way to fix this? i haven't try with java 1.4 for the moment
You schould look to jvm parameters on old server. Your language parameters will change comma to dot actually so you do not need any code changes.
I think its not due to java version. Replace comma(,) with "" or period(.)
For example conside a string : String str = "0000000000000000009011,00";
Now you can try -
double result = Double.valueOf(str.replace(",", "."));
or
double result = Double.valueOf(str.replace(",", ""));
Rather use NumberFormat for parsing:
NumberFormat format = NumberFormat.getInstance(Locale.FRANCE);
Number number = format.parse("0000000000000000009011,00");
double d = number.doubleValue();
This way you can select the right locale for the number representation. In the example above I used France - they use a comma for the decimal point.
I'm having the strangest thing with a DecimalFormat.
I'm using it in an webapplication.
I setup some test and it keeps on failing with me locally.
A friend of me ran it and he was able to successfully ran the JUnit tests.
The strange part is that on our server the application runs it perfectly without any problems either.
Could it be that Java depends on the system settings like valuta and number settings?
Or could there be another reason?
This is how my piece of code looks like:
public String generateFormatPrice(double price) throws Exception {
DecimalFormat format1 = new DecimalFormat("#,##0.00");
String tmp = format1.format(price).replace(".", "&");
String[] tmps = tmp.split("&");
return tmps[0].replace(',', '.') + "," + tmps[1];
}
Thanks a lot in advance!
This code is indeed locale-specific. If your code depends on being in a locale such as the USA where "." is the decimal separator and "," is the thousands separator, and then you run this code on a server set to, for example, the German locale, it will fail.
Consider using this constructor, which allows you to explicitly specify which symbols you are using.
EDIT: as far as I can tell you are trying to format numbers using "." as the thousands separator and "," as the decimal separator. In other words, the format used in France and Germany. Here's one approach that will achieve this:
public static String generateFormatPrice(double price) {
final NumberFormat format = NumberFormat.getNumberInstance(Locale.GERMANY);
format.setMinimumFractionDigits(2);
format.setMaximumFractionDigits(2);
return format.format(price);
}
Also, you shouldn't be using a double to hold a monetary value - you are going to encounter some nasty bugs if you do that.
How do I get these formats in java?
Input:
1223893
180703
80967
1461
700
Output :
1,223,893
180,703
80,967
1,461
700
I will be always converting one by one number, this was just to get more examples.
you can read up on java number formatting here
so you would do something like this:
DecimalFormat myFormatter = new DecimalFormat('###,###,###');
String output = myFormatter.format('1223893');
if you output the output var it should have 1,223,893
Look for "grouping" and "thousands separator" here. DecimalFormatSymbols provides setGroupingSeparator(',') and you can set it on a DecimalFormat, together with setGroupingSize(3). To illustrate:
DecimalFormat df = new DecimalFormat();
df.getDecimalFormatSymbols().setGroupingSeparator(',');
df.setGroupingSize(3);
System.out.println(df.format(1223893)); // prints 1,223,893
You could use DecimalFormat.
Take a look at the DecimalFormat class.
google for NumberFormat in java
See the api docs.
How do I format a Double with String.format to String with a dot between the integer and decimal part?
String s = String.format("%.2f", price);
The above formats only with a comma: ",".
String.format(String, Object ...) is using your JVM's default locale. You can use whatever locale using String.format(Locale, String, Object ...) or java.util.Formatter directly.
String s = String.format(Locale.US, "%.2f", price);
or
String s = new Formatter(Locale.US).format("%.2f", price);
or
// do this at application startup, e.g. in your main() method
Locale.setDefault(Locale.US);
// now you can use String.format(..) as you did before
String s = String.format("%.2f", price);
or
// set locale using system properties at JVM startup
java -Duser.language=en -Duser.region=US ...
Based on this post you can do it like this and it works for me on Android 7.0
import java.text.DecimalFormat
import java.text.DecimalFormatSymbols
DecimalFormat df = new DecimalFormat("#,##0.00");
df.setDecimalFormatSymbols(new DecimalFormatSymbols(Locale.ITALY));
System.out.println(df.format(yourNumber)); //will output 123.456,78
This way you have dot and comma based on your Locale
Answer edited and fixed thanks to Kevin van Mierlo comment
If it works the same as in PHP and C#, you might need to set your locale somehow. Might find something more about that in the Java Internationalization FAQ.