Truncation or DecimalFormat in Java

Question

I have this:

if (inKm) 
{
    text = String.valueOf(MetricConverter.milesToKilometers(Double.valueOf(text)));

}

This yields a result into a JTextField that is a bit too long for my liking. How do I truncate or use decimalformat on the resulting value? When I used decimalformat within this expression it just bugged out the program.

You may want to look at the answer here: http://stackoverflow.com/a/3596122/859485 — Andre M, Apr 12 '13 at 16:01

score 2 · Accepted Answer · answered Apr 12 '13 at 15:49

2

I like to use this since it's so similar to printf()

double doubleValue = 123.4567895;
String.format("%.2f", doubleValue); // returns "123.46"

Edit: This does not truncate, but rounds half-up.

More info on how to use the String.format(), and java.util.Formatter:
http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html

answered Apr 12 '13 at 15:49

Goodwine

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Ah, okay. I want to get it to one decimal place. – Randy B. Apr 12 '13 at 15:51
That's not what I mean. This also bugs out the program – Randy B. Apr 12 '13 at 15:54
@RandyB. Are you doing `text = String.format("%.1f", MetricConverter.milesToKilometers(Double.valueOf(text)));`? or what kind of error are you getting? `NumberFormatException`? – Goodwine Apr 12 '13 at 15:57
when I do that, it does cut off, but it messes up the calculation in some way. I cant figure out why just yet – Randy B. Apr 12 '13 at 16:01

Truncation or DecimalFormat in Java

1 Answers1