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javanumber-formattingtrim

How to format 18 digit double to become 10 string character

double pdouble= 3.3603335204002837E12;

String pstart= Double.toString(pdouble).replace(".", "") .trim()

String.format("%10d", pstart);

System.out.println("pstart"+pstart);

Can I know why it not works...
It display this:

Exception in thread "main"
java.util.IllegalFormatConversionException: d != java.lang.String at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4302) .I

Hope anybody can help

Solution

  • %d is for int. As pstart is a String, Use b or s.

    String.format("%10s", pstart);

    Output

    33603335204002837E12

    Read Java String format()

    However if you need only the first 10 digits from your number, try using DecimalFormat

    DecimalFormat d = new DecimalFormat("0000000000");
String number = d.format(pdouble);

    Output

    3360333520400

    This will also add leading 0s if the number is less than 10 digits.