CODEWITHSUNDEEP
javastringdouble
This is temp display name
This is temp display name

Reputation: 291

java How do I convert double to string directly?

I want to convert double to string. If I use Double.toString or String.valueOf it gives someting awful like 5e-10 or something like that.

if i have x = 0.00000032 i want to have string "0.00000032", simply.

I did it in a long way and I want to know whether there is a better (shorter) way to do it.

            szText += String.format("%.20f", dOutput);

            iZeros = 0;
            for(int i=szText.length() - 1; i>=0; i--)
            {
                if(szText.charAt(i) == '0')
                    ++iZeros;
                else break;
            }

            szText = szText.substring(0, szText.length() - iZeros);

Upvotes: 0

Views: 167

Answers (3)

Sri
Sri

Reputation: 1

BigDecimal.valueOf(value).setScale(decimalLimit, RoundingMode.HALF_UP).toPlainString()

Upvotes: 0

Paul Hicks
Paul Hicks

Reputation: 14019

This is the prime use case for the DecimalFormat class.

You'll want something along the lines of

DecimalFormat formatter = new DecimalFormat("#.#");
String output = formatter.format(input);

The default behaviour of DecimalFormat is to round the fraction part to one decimal place. To change that, use MadProgrammer's solution of setting formatter.setMaximumFractionDigits(100) or something like that.

Upvotes: 1

MadProgrammer
MadProgrammer

Reputation: 347332

There's probably better choices, but you could use something like...

NumberFormat nf = NumberFormat.getNumberInstance();
nf.setMaximumFractionDigits(100);

double x = 0.00000032d;
System.out.println(x);
System.out.println(nf.format(x));

Which outputs

3.2E-7
0.00000032

You might want to play around with the maximumFractionDigits property to you specific needs...

Upvotes: 5

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