Convert double to String in Java

Question

I am to convert a double value to a String.

double d=12345678.999;
String str = String.valueOf(d);

or, just plain

String str = ""+d;

Does it, however in the exponent form-- returning the String value:

1.2345678999E7

I need the value as is in the String:

12345678.999

Is there a way to do this? I can parse the string for the value of exponent-- the portion after 'E' and go from there, but there must be an easier way of doing this.

//===========================

EDIT:

the length of the decimal part in the input isn't known, it can be any number of digits:

12345678.999

or

12345678.9999999

Imposing a format for the decimal part would fix the number of decimal digits(?)

Use [`NumberFormat`](http://docs.oracle.com/javase/8/docs/api/java/text/NumberFormat.html). — Luiggi Mendoza, Jul 31 '14 at 19:55
Try this one:http://stackoverflow.com/questions/2722122/java-parse-a-number-in-exponential-notation — Lior Ohana, Jul 31 '14 at 19:57
Here you have a useful post http://stackoverflow.com/questions/12806278/double-decimal-formatting-in-java — Federico Piazza, Jul 31 '14 at 19:58

score 3 · Accepted Answer · answered Jul 31 '14 at 19:58

3

You should use NumberFormat to format Strings so that they do not show up in scientific notation.

String str = NumberFormat.getInstance().format(d);

answered Jul 31 '14 at 19:58

user2097804

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java.text.NumberFormat.getInstance().format(0.9999999d) Generate 1 – Ahmad Alkhatib Aug 01 '18 at 11:11

score 2 · Answer 2 · answered Jul 31 '14 at 19:57

2

use String.format():

double d=12345678.999;
System.out.println(String.format("%12.3f", d));

answered Jul 31 '14 at 19:57

morgano

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Convert double to String in Java

2 Answers2

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