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.
Related
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();
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 learn Java thourgh Android Studio with Java, i was stuck at the Float Format, how can you display, for example: 1.234E10 instead of 12340000000000, thanks guys
12340000000000 is actually 1.234E13
DecimalFormat formatter = new DecimalFormat("0.###E0");
String format = formatter.format(12340000000000.0);
System.out.println(format);
Output:
1.234E13
1.234E10 is actually the same as 12340000000000 only it's printed out in an engineering format and it's a hell of a lot more readable than 12340000000000.
I have a number 10.625
In JavaScript
10.625.toFixed(2) //gives 10.63
In Java,
Double.valueOf(new DecimalFormat("###.##").format(Double.valueOf("10.625"))) //gives 10.62
How I can achieve unique output both at client and server side?
This will print 10.63, and the conversion back to Double will be based on this value.
DecimalFormat df = new DecimalFormat("###.##");
df.setRoundingMode(RoundingMode.HALF_UP);
System.out.println(df.format(Double.valueOf("10.625")));
The way to harmonise the view of the number on client and server is to do your processing on the server and have the client display what the server sends it.
Use the Java version on the server, convert to a String, and send that to the client. Then you'll just be doing the conversion once, and won't have the possibility of a conflict.
After all, the client is just supposed to be giving a nice view of what the server has done. Repeating the calculations on the client is not the right way to think about it.
You could use Math.round(value * 100) / 100 for both java and javascript.
BigDecimal bd = new BigDecimal("10.625");
bd = bd.setScale(2,BigDecimal.ROUND_HALF_UP);
double value = Double.parseDouble(new DecimalFormat(".##").format(bd));
System.out.println(value);
will also print 10.63
Some important infos to catch :
since you never want to know how much digit before . then you can simpy use .##
On DecimalFormat ==> .## format will print 0.x0 to 0.x while '0.00' format will print 0.x0 to 0.x0 so i prefer the second format
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.