Java Utililty Methods Double to String

List of utility methods to do Double to String

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Description

The list of methods to do Double to String are organized into topic(s).

Method

StringdoubleToString(final double d)
Returns the double as a String, without a decimal point if the double actually stores an integer 
final int i = (int) d;
return i == d ? String.valueOf(i) : String.valueOf(d);
StringdoubleToString(final double v, final int roundingDigits)
Rounds by dropping roundingDigits of double precision (similar to 'hidden precision digits' on calculators), and formats to String. 
final double absv = Math.abs(v);
final String str = roundingDigits == FLOAT_PRECISION ? Float.toString((float) absv) : Double.toString(absv);
StringBuffer buf = new StringBuffer(str);
int roundingStart = (roundingDigits <= 0 || roundingDigits > 13) ? 17 : (16 - roundingDigits);
int ePos = str.lastIndexOf('E');
int exp = (ePos != -1) ? Integer.parseInt(str.substring(ePos + 1)) : 0;
if (ePos != -1) {
    buf.setLength(ePos);
...
StringdoubleToString(final Double value)
Converts a double into an SVG decimal string. 
final int intValue = value.intValue();
if (approximatelyEqual(intValue, value)) {
    return Integer.toString(intValue);
return value.toString();
StringdoubleToString(final Double value)
For Visual Studio compatibility: converts a Double-type to a String, but ensures that whole numbers have no decimal point. 
if (value == null) {
    return null;
if (value.intValue() == value.doubleValue()) {
    return Integer.toString(value.intValue());
return value.toString();
StringdoubleToString(final double value, final boolean stripDotZero)
Converts a given double value to a String with a single digit after that decimal point and optionally strips ".0" if present. 
return fixedPointToString((long) (value * 10), stripDotZero);
StringdoubleToString4(double value)
double To String 
if (Double.isNaN(value)) {
    return " --- ";
return String.format("%.4f", value);
StringdoubleToStringWithMinimumPrecision(double d)
double To String With Minimum Precision 
return d == (int) d ? String.format("%d", (int) d) : String.format("%s", d);