Java Utililty Methods Decimal Format

List of utility methods to do Decimal Format

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Description

The list of methods to do Decimal Format are organized into topic(s).

Method

StringgetTwoPoint(double val)
get Two Point 
DecimalFormat nf = new DecimalFormat("0.00");
return nf.format(val);
StringgetValue(double value)
Gets the value. 
if (isNotSet(value)) {
    return "";
return format(value);
booleanisDouble(String _str)
Checks if the given string is a valid double (including negative values). 
return isDouble(_str, true);
booleanisLikelyDouble(long value)
is Likely Double 
if (value == canonicalDoubleNaN || value == maxDouble || value == piDouble || value == eDouble) {
    return true;
if (value == Long.MAX_VALUE || value == Long.MIN_VALUE) {
    return false;
double doubleValue = Double.longBitsToDouble(value);
if (Double.isNaN(doubleValue)) {
...
doubleisprime(double x)
isprime 
if ((Math.round(x) != toFix(x, 12)) || (x < 2)) {
    throw new IllegalArgumentException("isPrime(n), where n >= 2 is an integer");
} else {
    long n = Math.round(x);
    for (long i = 2; i <= Math.sqrt(n); i++) {
        double factor = n * 1.0 / i;
        if (Math.round(factor) == toFix(factor, 12))
            return 0;
...
booleanisValidDouble(String value, int decimals)
Tell whether a double string is in valid format, according with a number of fraction digits. 
DecimalFormat df;
df = (DecimalFormat) DecimalFormat.getInstance(Locale.getDefault());
DecimalFormatSymbols dsym = df.getDecimalFormatSymbols();
char decSepar = dsym.getDecimalSeparator();
if (value == null || value.trim().equals(""))
    return true;
value = value.trim();
if (value.indexOf(decSepar) != value.lastIndexOf(decSepar))
...
StringJulian_Cal(double JDN)
Julia Cal 
int D, 
        Y, M;
double N1, N2, Y1, M1;
N1 = (JDN - 1721119.0) + 2.0;
Y1 = Math.floor((N1 - 0.2) / 365.25);
N2 = N1 - Math.floor(365.25 * Y1);
M1 = Math.floor((N2 - 0.5) / 30.6);
D = (int) (N2 - 30.6 * M1 + 0.5);
...
StringlistToString(List list)
list To String 
if (list.isEmpty()) {
    return "[]";
StringBuilder str = new StringBuilder();
str.append("[").append(formatDouble(list.get(0)));
for (int i = 1; i < list.size(); i++) {
    str.append(", ").append(formatDouble(list.get(i)));
str.append("]");
return str.toString();
StringnumToString(double num)
Format an integer to a string (adding commas) 
return numToString(num, 0);
Stringpad(double n)
pad 
return formatter.format(n);