Pastable version of ISIN check digit

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 <pre class="sunburst">package net.alessandropetrozzelli;

class InvalidISINCharacterException
 extends Exception {
 InvalidISINCharacterException() {
 super();
 }

InvalidISINCharacterException(String s) {
 super(s);
 }
}

public class Isin {
 static final int numberTableOffset = '0';
 static final int numberTableEndOffset = '9';
 static final int charTableOffset = 'A';
 static final int charTableEndOffset = 'Z';

private static int getIntValueForISINChar(final char c) throws
 InvalidISINCharacterException {
 int value = 0;

if ( (c &gt;= numberTableOffset) &amp;&amp; (c &lt;= numberTableEndOffset)) {
 value = c - numberTableOffset;
 }
 else if ( (c &gt;= charTableOffset) &amp;&amp; (c &lt;= charTableEndOffset)) {
 value = 10 + (c - charTableOffset);
 }
 else {
 throw new InvalidISINCharacterException(&quot;Unsupported character: &quot; + c);
 }

return value;
 }

private static int getSumOfDigits(final int number) {
 int sumOfDigits=0;
 if (number&lt;=9) {
 sumOfDigits = number;
 } else {
 String s = String.valueOf(number);
 try {
 for (int i = 0; i &lt; s.length(); i++) {
 sumOfDigits += getIntValueForISINChar(s.charAt(i));
 }
 }
 catch (InvalidISINCharacterException ex) {
 System.out.println(ex);
 return -1;
 }
 }
 return sumOfDigits;
 }

public static int getCheckDigit(final String isin) {
 int checkDigit = 0;

if ( (isin == null) || (isin.length() != 11)) {
 return -1;
 }
 String incompleteISINcode = isin.toUpperCase();
 StringBuffer buffer = new StringBuffer();

// convert every single character into number as specified
 try {
 for (int i = 0; i &lt; incompleteISINcode.length(); i++) {
 buffer.append(getIntValueForISINChar(isin.charAt(i)));
 }
 }
 catch (InvalidISINCharacterException ex) {
 System.out.println(ex);
 return -1;
 }

// sum all digits (multiplying odd digits by 2)
 try {
 for (int i = buffer.length() - 1; i &gt;= 0; i--) {
 if ( (buffer.length() - i) % 2 == 1) {
 checkDigit += getSumOfDigits(getIntValueForISINChar(buffer.charAt(i)) * 2);
 }
 else {
 checkDigit += getIntValueForISINChar(buffer.charAt(i));
 }
 }
 }
 catch (InvalidISINCharacterException ex) {
 // this should never happen
 System.out.println(ex);
 return -1;
 }

// end result
 checkDigit = (10 - (checkDigit % 10)) % 10;
 return checkDigit;
 }
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Pastable version of ISIN check digit