Java Utililty Methods Number Format

List of utility methods to do Number Format

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Number Format

Description

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

Method

String format(int decs, double number)
Formats a number to a given amount of decimal places.

return String.format("%." + decs + "f", number);

String format(int number, int length)
format

String numberString = Integer.toString(number);
char[] erg = new char[length];
for (int i = 0; i < length; i++) {
 erg[i] = '0';
char[] numberStringChars = numberString.toCharArray();
for (int i = 0; i < numberString.length(); i++) {
 erg[length - 1 - i] = numberStringChars[numberString.length() - 1 - i];
...

String format(Number number)
Returns a formatted string of the specified number.

String formatted = Double.toString(number.doubleValue()).replaceAll("\\.0+$", "") 
 .replaceAll("(\\.[0-9]*[1-9])0+$", "1ドル"); 
return formatted;

String format(String number)
format

StringBuilder cleanedNumber = new StringBuilder();
for (int index = 0; index < number.length(); index++) {
 char c = number.charAt(index);
 if (c == '+' || c == '0' || c == '1' || c == '2' || c == '3' || c == '4' || c == '5' || c == '6'
 || c == '7' || c == '8' || c == '9')
 cleanedNumber.append(c);
return cleanedNumber.toString();
...

Double format(String number)
format

Double ret = null;
String work = number.replace(',', '.');
ret = new Double(work);
return ret;

String formatAmountDigits(String numberString, int length)
format Amount Digits

while (numberString.length() < length) {
 numberString = "0" + numberString;
return numberString;

byte[] formatBinaryNumber(int number, int size)
format Binary Number

byte[] bin = new byte[size];
int work = number;
for (int i = (size - 1); i >= 0; i--) {
 int b = (work & 0xff);
 bin[i] = (byte) b;
 work = (work >> 8);
return bin;
...

String formatBytes(long number)
format Bytes

float div = 1024;
float start = number;
int pfix = 0;
while (start > div) {
 start = start / div;
 pfix++;
start = ((long) (start * 10)) / 10f;
...

String formatBytesHumanReadable(float number)
format Bytes Human Readable

String unit = "bytes";
if (number > 1024) {
 number /= 1024;
 unit = "KiB";
if (number > 1024) {
 number /= 1024;
 unit = "MiB";
...

String formatCardNumber(String cardNumber)
format Card Number

StringBuilder formatted = new StringBuilder();
if (cardNumber.length() == 10 && cardNumber.startsWith("B")) {
 formatted.append(cardNumber.substring(0, 1));
 formatted.append(' ');
 formatted.append(cardNumber.substring(1, 8));
 formatted.append(' ');
 formatted.append(cardNumber.substring(8));
} else if (cardNumber.length() == 12) {
...