Java Utililty Methods Fraction Format

java.text.DecimalFormat df = new java.text.DecimalFormat("0.00");
return df.format(num);

String result = "";
try {
    result = new DecimalFormat(numericFormat).format(num);
} catch (Exception e) {
return result;

long m = (long) Math.pow(10, n);
num *= m;
long aux = ((long) num);
num = (double) ((double) aux / (double) m);
return num;

DecimalFormat doubleFormat = new DecimalFormat(pattern);
String resultStr = doubleFormat.format(num);
return resultStr;

DecimalFormat vf = new DecimalFormat("#00.#E0");
String str = vf.format(number);
str = str.replace("E0", " ");
str = str.replace("E3", "k");
str = str.replace("E6", "M");
str = str.replace("E9", "G");
str = str.replace("E12", "T");
str = str.replace("E-3", "m");
...

if (number == (int) number)
    return String.valueOf((int) number);
else
    return String.valueOf(number);

NumberFormat format = NumberFormat.getNumberInstance();
format.setMaximumFractionDigits(2);
format.setMinimumFractionDigits(0);
format.setGroupingUsed(false);
return format.format(number);

return format("" + number, digits);

return new DecimalFormat(fmt).format(number);

DecimalFormat formatter = new DecimalFormat("###,###,##0.00");
return formatter.format(price);