Java output formatting -- trailing zeros

Question

I have a few doubles in my code that need to output with no more than two decimal places while ignoring trailing zeros. For example:

    2.0334=2.03  
    10.20=10.2  
    24.0032=24

I also have other doubles that I have to output with different formats, including trailing zeros and different precisions. Multiple formats may be output in the same System.out.format() line. From what I know about DecimalFormat (which, admittedly, isn't much), I can't output two decimals with different formats on the same line. I'm trying to use System.out.format() for that reason, but I can't make it ignore trailing zeros. Is this possible, or am I stuck with only DecimalFormat? Thanks!

You can output two numbers with different formats on the same line using multiple instances of DecimalFormat. If that's what you want to do. You just can't use the same instance to format in two different ways at the same time. — Paul Hicks
– Paul Hicks, Commented Feb 12, 2014 at 0:32

Warlord · Accepted Answer · 2014-02-12 01:00:53Z

1

You can use different instances of DecimalFormat to format various numbers as you wish first and print them afterwards.

double num1 = 2.0334;  
double num2 = 10.2;
double num3 = 24.0032;

DecimalFormat df1 = new DecimalFormat("#.##");
DecimalFormat df2 = new DecimalFormat("#.#");
DecimalFormat df3 = new DecimalFormat("#");

System.out.print(String.format("%s %s %s", df1.format(num1), df2.format(num2),
        df3.format(num3));

Or straight away using formatted output of printf(),

System.out.printf("%.2f %.1f, %.0f", num1, num2, num3);

edited Feb 12, 2014 at 1:00

answered Feb 12, 2014 at 0:41

Warlord

2,82418 silver badges21 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

user3283171 Over a year ago

Thanks for this, wasn't aware I could do that. But for my own curiosity, is there any way to do it without DecimalFormat? For example (with made up syntax): System.out.format("%.2f, %.3f", double1(ignoreZeros), double2) ?

Warlord Over a year ago

Yup you can, and you almost nailed the syntax too, check System.out.prinf() documentation for details.

user3283171 Over a year ago

I'm looking through the documentation, but I don't see any way to remove trailing zeros from a double. Leading zeros, yes, but not trailing zeros. Any way you'd be willing to show me the syntax you're talking about? Thanks!

Warlord Over a year ago

If you want to remove trailing zeroes, I'd say you have to stick to DecimalFormat(), or do it manually, no way of doing it through formatted string output I know of.

Collectives™ on Stack Overflow

Java output formatting -- trailing zeros

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related