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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.     public static void main(String[] args) {
  11.         for (String str : Arrays.asList("046-444-286", "06-454-286", "046-454-286")) {
  12.             System.out.println(str+" > "+isValidSin(str));
  13.         }
  14.     }
  15.  
  16.     static boolean isValidSin(String sinNumber) {
  17.         boolean validSin = sinNumber.matches("\\d{3}-\\d{3}-\\d{3}");
  18.  
  19.         if (validSin) {
  20.             String sinTwo = sinNumber.replace("-", "");
  21.             int sum = 0;
  22.             for (int i = 0; i < sinTwo.length(); i++) {
  23.                 int digit = Character.getNumericValue(sinTwo.charAt(i));
  24.                 if (i % 2 != 0) {
  25.                     digit = digit * 2;
  26.                 }
  27.                 digit = digit / 10 + digit % 10;
  28.                 sum += digit;
  29.             }
  30.             validSin = sum % 10 == 0;
  31.         }
  32.  
  33.         return validSin;
  34.     }
  35.  
  36. }
Success #stdin #stdout 0.05s 2184192KB
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stdin
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Standard input is empty
stdout
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046-444-286 > false
06-454-286 > false
046-454-286 > true
https://ideone.com/F6soee
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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