Rounding off a double to 3 digit decimal place but zero at 3rd decimal place disappears in java

Question

I want to round of my double to 3 decimal places in java.

I don't want to trim off the zero. So if my double is 2.34, I still want it as 2.340.

possible duplicate of [Round a double to 2 significant figures after decimal point](http://stackoverflow.com/questions/2808535/round-a-double-to-2-significant-figures-after-decimal-point) — tchrist, Sep 05 '12 at 23:23

score 8 · Answer 1 · answered Sep 24 '10 at 13:56

8

DecimalFormat myFormatter = new DecimalFormat("0.000");
String output = myFormatter.format(2.34d);

answered Sep 24 '10 at 13:56

dhblah

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score 4 · Answer 2 · edited Sep 27 '10 at 07:13

4

String res = String.format("%.3f", 2.34);

or if you want to print

System.out.printf( "%.3f",2.34);

edited Sep 27 '10 at 07:13

Aaron Digulla

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answered Sep 24 '10 at 13:51

keshav84

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score 1 · Answer 3 · answered Jun 26 '13 at 13:40

1

use setMinimumFractionDigits and setRoundingMode

    final DecimalFormat df = new DecimalFormat();
    df.setMinimumFractionDigits(3);
    df.setRoundingMode(RoundingMode.HALF_UP);
    df.format(2.34);

answered Jun 26 '13 at 13:40

Lealem Admassu

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score 1 · Answer 4 · answered Sep 24 '10 at 13:49

1

Use the following decimal format: 0.000

answered Sep 24 '10 at 13:49

Aaron Digulla

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@prashant be aware that there's a difference in how a number is stored in the computer, and how it is displayed. This answer, and keshu's, show how to display the number with the trailing 0. It isn't actually being stored that way but that's unimportant. – Tony Ennis Sep 24 '10 at 13:57

score 0 · Answer 5 · answered Sep 25 '10 at 01:20

Following on from Tony Ennis's comment, you can't round a floating-point variable to a specific number of decimal places, or digits, without converting it into base-10. That's what the answers above are doing, and they are also converting it into displayable text.

Rounding off a double to 3 digit decimal place but zero at 3rd decimal place disappears in java

5 Answers5