Crear cuentaimport java.math.BigInteger;
public class Main { public static final int IBANNUMBER_MIN_SIZE = 15; public static final int IBANNUMBER_MAX_SIZE = 34;public static final BigInteger IBANNUMBER_MAGIC_NUMBER = new BigInteger("97");
public static boolean ibanTest(String accountNumber) {
String newAccountNumber = accountNumber.trim();
// Check that the total IBAN length is correct as per the country. If not, the IBAN is invalid. We could also check
// for specific length according to country, but for now we won't
if (newAccountNumber.length() < IBANNUMBER_MIN_SIZE || newAccountNumber.length() > IBANNUMBER_MAX_SIZE) {
return false;
} // Move the four initial characters to the end of the string.
newAccountNumber = newAccountNumber.substring(4) + newAccountNumber.substring(0, 4);
// Replace each letter in the string with two digits, thereby expanding the string, where A = 10, B = 11, ..., Z = 35.
StringBuilder numericAccountNumber = new StringBuilder();
for (int i = 0;i < newAccountNumber.length();i++) {
numericAccountNumber.append(Character.getNumericValue(newAccountNumber.charAt(i)));
} // Interpret the string as a decimal integer and compute the remainder of that number on division by 97.
BigInteger ibanNumber = new BigInteger(numericAccountNumber.toString());
return ibanNumber.mod(IBANNUMBER_MAGIC_NUMBER).intValue() == 1;
}public static void main(String[] args) {
System.out.println(ibanTest("ES0000000000000000000000"));
}}
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