Java Utililty Methods Number Format

List of utility methods to do Number Format

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Description

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

Method

StringformatNumber(long value)
Formats an integer as a string 
return String.format("%,d", value);
StringformatNumber(Number number)

Format a Number into a String making sure that NullPointerException s are not thrown.

if (number == null)
    return null;
return (number.toString());
StringformatNumber(Object num)
format Number 
if (num == null)
    return null;
String number = num.toString().trim();
if (number.length() == 0)
    return null;
if (number.indexOf(".") == -1)
    return number;
return number.length() - number.indexOf(".") > 2 ? number.substring(0, number.indexOf(".") + 3) : number;
...
StringformatNumber(String formatStr, int length, boolean leftPadding, char paddingCharacter)
format Number 
StringBuilder result = new StringBuilder(formatStr);
String paddingStr = String.valueOf(paddingCharacter);
while (result.length() < length) {
    if (leftPadding) {
        result = (new StringBuilder(paddingStr)).append(result);
    } else {
        result.append(paddingCharacter);
return result.toString();
StringformatNumber(String num, int n)
format Number 
if (num != null) {
    while (num.length() < n) {
        num = "0" + num;
return num;
StringformatNumber(String s, Character thousandsSeparator, Character decimalSeparator)
in order to transform the number "1234567.89" to string 123,456.89 
if (s == null) {
    return null;
String result = s;
int decimalIndex = s.indexOf("."); 
if (decimalIndex == -1) {
    if (thousandsSeparator != null) {
        return formatNumber(result, thousandsSeparator);
...
StringformatNumber(String value)
format Number 
if (value == null)
    return null;
return value.replace(",", ".");
StringformatNumberFloorWithPostfix(int value)
Formats the number in value into a floored, postfixed form for display. 
if (value >= 1000000000) {
    return String.format("%dG", value / 1000000000);
if (value >= 1000000) {
    return String.format("%dM", value / 1000000);
if (value >= 10000) {
    return String.format("%dk", value / 1000);
...
StringformatNumberImpl(long i, int digits, String fill)
format Number Impl 
int ten = 10;
String res = "";
while (digits > 1) {
    if (i < ten) {
        res += fill;
    digits--;
    ten *= 10;
...
StringformatNumbers(final int... numbers)
Returns a formatted string to describe the supplied numbers. 
final StringBuilder sb = new StringBuilder();
if (numbers.length == 1) {
    sb.append(numbers[0]).append(" ");
} else {
    sb.append("( ");
    for (int number : numbers) {
        sb.append(number).append(" ");
    sb.append(") ");
return sb.toString();