Java中的截断或DecimalFormat

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.

Answer 1

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