java how to change this 2.52E-5 to this 0.0000252?

Question

Just like in subject: i've got double like this:

2.52E-5

what i need is this:

0.0000252

and my only idea how to do it is make sth like this:

public Double change(Double d){
    String do = Double.toString(d);
    String[] a = do.split("E");
    double b = Double.parseDouble(a[0]);
    double c = Double.parseDouble(a[1]);
    Double result = (Double)Math.pow(b, c);
    return result;
}

But I'm just curious if there is already a ready method

http://stackoverflow.com/questions/18946388/double-value-with-specific-precision-in-java — seenukarthi, Jul 30 '15 at 07:01
I love the way you've tackled this - very creative but alas incorrect. Don't confuse *data* with *formatting*. — Bathsheba, Jul 30 '15 at 07:05
so you want to convert a double to a double ? well you don't need formatting — Hacketo, Jul 30 '15 at 07:13

score 1 · Accepted Answer · answered Jul 30 '15 at 07:01

1

You can use printf() like:

System.out.printf("%f\n", value);

Or DecimalFormat look this:

DecimalFormat df = new DecimalFormat("#");
df.setMaximumFractionDigits(8);
System.out.println(df.format(value));

Or very simply with BigDecimal and toPlainString:

new BigDecimal(value).toPlainString()

answered Jul 30 '15 at 07:01

JoGe

872
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26

It returns an error : `Exception in thread "AWT-EventQueue-0" java.util.IllegalFormatConversionException: f != java.lang.String` – anat Jul 30 '15 at 07:08
on which line? What version of Java are you using? – JoGe Jul 30 '15 at 07:12
Ok, nevermind... I've forgot that this is String and it contains some letters, it works great, thanks – anat Jul 30 '15 at 07:14

score 0 · Answer 2 · answered Jul 30 '15 at 07:15

0

They are the same number already. For example, on Java Repl you can do

java> 0.0000252 == 2.52e-5
java.lang.Boolean res0 = true

answered Jul 30 '15 at 07:15

Chris Taylor

46,912
15
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java how to change this 2.52E-5 to this 0.0000252?

2 Answers2