Question

For example:

double a = 2000;
System.out.println(a);

Prints out 2000.0, whereas I would like to print 2E3. With a double of 2 I desire 2E0 etc.

I know that it begins to print like this when you reach 20000000 (2E7) and would like to do it for any value of Double. Is there some libairy/function to do this? I’ve spent some hours looking through google results to no avail. I get the impression this may be possible by heavily manipulating the .toHexCode() output but I couldn’t get my head around the documentation of its output. How would I go about doing this?

Answer 1

Have a look at the docs for DecimalFormat, that should do what you need.

EDIT: here’s an example (haven’t checked this):

double myDouble = 2000;
NumberFormat formatter = new DecimalFormat("0E0");
System.out.println(formatter.format(myDouble)); // Should print "2E3"