Java: Converting a double to a String

Question

I have a double whose value is 10,000,000.00 (ten millions). I have to convert it to a String. When using the method toString I am getting the String "1.0E7" which is correct following the specification. Unfortunately I need the String "10,000,000.00" (or the equivalent depending on the locale).

How can achieve this?

Answer 1

Try either

NumberFormat http://java.sun.com/javase/6/docs/api/java/text/NumberFormat.html

DecimalFormat http://java.sun.com/javase/6/docs/api/java/text/DecimalFormat.html

Answer 2

In addition to the formatter, you might consider using the java.math.BigDecimal class to represent numbers precisely.

Calculations where complete accuracy is required, such as financial calculations, are best performed with BigDecimal. Floating point math is better for engineering, graphics, and other mathematical computations where some accuracy can be sacrificed for speed.

Answer 3

  public static void main(String[] args) throws ParseException {
    double aDouble = 10000000.00;
    DecimalFormat nf = (DecimalFormat) NumberFormat.getInstance(Locale.US);
    String aString = Double.toString(aDouble);
    System.out.println(nf.parse(aString));
  }

Answer 4

Look into "DecimalFormat". It lets you format the output pretty much however you want!