Java Utililty Methods Number Round

List of utility methods to do Number Round

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Description

The list of methods to do Number Round are organized into topic(s).

Method

introundToPowerOf2(int value)
round To Power Of 
value--;
value |= value >> 1;
value |= value >> 2;
value |= value >> 4;
value |= value >> 8;
return value + 1;
doubleroundToPrecision(double number, int precision)
round To Precision 
double decimalPlaces = Math.pow(10, precision);
return Math.round(decimalPlaces * number) / decimalPlaces;
floatroundToPrecision(float value, int numDecimalPlaces)
Rounds a number to a (generally) smaller number of decmiel places. 
float multiplyFactor = (float) Math.pow(10f, numDecimalPlaces);
float valueMultiplied = value * multiplyFactor;
return (float) Math.round(valueMultiplied) / multiplyFactor;
floatroundToQuarterMs(float f)
rounds to nearest increment of 0.25 
return ((float) Math.round(f * 4)) / 4;
shortroundToShort(final double d)
round To Short 
return (short) (d + 0.5);
doubleroundToSignificantDigits(double num, int n)
round To Significant Digits 
if (num == 0) {
    return 0;
} else if (n == 0) {
    return Math.round(num);
String s = num + "";
int index = s.indexOf(".");
while (n >= s.length() - index) {
...
doubleroundToSignificantDigits(double value, int n)
Rounds a number to a given number of significant decimal digits. 
if (isEqual(value, 0.0)) {
    return 0.0;
final double d = Math.ceil(Math.log10(value < 0.0 ? -value : value));
final int power = n - (int) d;
final double magnitude = Math.pow(10.0, power);
final long shifted = Math.round(value * magnitude);
return shifted / magnitude;
...
Double[]roundToSignificantDigits(double x, double y, int nSignif)
Function to round x and y to a number of digits enough to show the difference in range This is for pretty printing only. 
Double[] rounded = new Double[2];
double diff = Math.abs(x - y);
if (diff < 1e-16) {
    rounded[0] = x;
    rounded[1] = y;
    return rounded;
if (diff > 1) {
...
doubleroundToSignificantFigures(double num, int n)
round To Significant Figures 
if (num == 0) {
    return 0;
final double d = Math.ceil(Math.log10(num < 0 ? -num : num));
final int power = n - (int) d;
final double magnitude = Math.pow(10, power);
final long shifted = Math.round(num * magnitude);
return shifted / magnitude;
...
StringRoundToStr(double value, int dec)
Round To Str 
return String.format("%8." + dec + "%", value);