double to string formatting

Question

I have a Double value xx.yyy and I want to convert to string "xxyyy" or "-xxyy", if the value is negative.

How could I do it?

Regards.

Martijn Courteaux · Accepted Answer · 2010-09-09 16:28:28Z

8

double yourDouble = 61.9155;
String str = String.valueOf(yourDouble).replace(".", "");

Explanation:

String.valueOf(): converts your double to a String
str.replace(s1, s2): returns a new string equals to str where all s1's are replaced by s2's

Update:

The OP had some extra conditions (but I don't know exactly with one):

negative number -> only two decimals.

public static String doubleToSpecialString(double d)
{
    if (d >= 0)
    {
         return String.valueOf(d).replace(".", "");
    } else
    {
         return String.format("%.2f", d).replace(",", "");
    }
}

negative number -> one decimal less

public static String doubleToSpecialString(double d)
{
    if (d >= 0)
    {
         return String.valueOf(d).replace(".", "");
    } else
    {
         String str = String.valueOf(d);
         int dotIndex = str.indexOf(".");
         int decimals = str.length() - dotIndex - 1;
         return String.format("%." + (decimals - 1) + "f", d).replace(",", "");
    }
}

edited Sep 9, 2010 at 16:28

answered Sep 9, 2010 at 15:25

Martijn Courteaux

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9 Comments

dogbane Over a year ago

doesn't work for negative numbers. xx.yyy needs to become -xxyy, according to the question.

mtz Over a year ago

but what happens if the value is negative (-26.301), i'll get a 5 character length plus the sign ("-26301"), and I need only 4 plus the sign ("-2630").

Martijn Courteaux Over a year ago

@mtz: So, if it is a negative you only want two decimals or only 4 numbers?

mtz Over a year ago

The resulting string must be 5 characters in length. If the value is POSITIVE the two first digits are the integral part, the remaining three are the decimal part. If the value is NEGATIVE, the two first digits are the integral part, the remaining two are the decimal part and the first character is the negative sign.

Martijn Courteaux Over a year ago

@mtz: Alright! So you are sure that the double is always exactly in that format...

|

dogbane · Accepted Answer · 2010-09-09 16:34:18Z

3

This answer uses a Decimal Formatter. It assumes that the input number is always strictly of the form (-)xx.yyy.

/**
 * Converts a double of the form xx.yyy to xxyyy and -xx.yyy to -xxyy. 
 * No rounding is performed.
 * 
 * @param number The double to format
 * @return The formatted number string
 */
public static String format(double number){
    DecimalFormat formatter = new DecimalFormat("#");
    formatter.setRoundingMode(RoundingMode.DOWN);
    number *= number < 0.0 ? 100 : 1000;
    String result = formatter.format(number);
    return result;
}

answered Sep 9, 2010 at 16:34

dogbane

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