Bank card number LUHM check Java implementation code

1 ImportJava.util.regex.Matcher;2 ImportJava.util.regex.Pattern;3 4  Public classCheckbanknumber {5 6 7     //Description: Bank card number Luhm check8 9     //luhm Check rule: 16-digit bank card number (19-bit generic):Ten      One     //1. Place the 15 (or 18) position card number without the check digit from right to 1 to 15 (18) and multiply the number on the odd digit by 2.  A     //2. Add all 10 bits of the singular product, plus the numbers on all even digits.  -     //3. The addition and calibration potentials are divisible by 10.  -      the      -     //beginning 6 bits -     //private final static String Strbin = " 10,18,30,35,37,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,58,60,62,65,68,69,84,87,88,94,95,98,99 "; -  +     Private Final StaticString success= "true"; -      +     Private Final StaticString bad_length= "bank card number must be between 16 and 19"; A      at     Private Final StaticString not_number= "bank cards must all be numbers"; -      -     Private Final StaticString illegal_number= "bank card not in conformity with rules"; -      -      Public Staticstring Luhmcheck (String bankno) { -         if(Bankno.length () < | | Bankno.length () > 19) { in             returnbad_length; -             } to          +Pattern pattern = Pattern.compile ("[0-9]*"); -Matcher match =Pattern.matcher (bankno); the         if(match.matches () = =false) { *             returnNot_number; $         }Panax Notoginseng          - //if (strbin.indexof (bankno.substring (0, 2) = = = 1) { the //return "bank card number at the beginning of the 6-bit non-conforming specification"; + //        } A          the         intLastnum=integer.parseint (Bankno.substring (Bankno.length () -1,bankno.length ());//take out the last one (compare with Luhm) +          -String first15num=bankno.substring (0,bankno.length ()-1);//Top 15 or 18 digits $         //System.out.println (first15num); $         Char[] NewArr =New Char[First15num.length ()];//Flashback loading Newarr -         Char[] Temparr =First15num.tochararray (); -          for(inti = 0; i < temparr.length; i++){ theNewarr[temparr.length-1-i] =Temparr[i]; -         }Wuyi         //System.out.println (NEWARR); the          -          Wu         int[] Arrsinglenum =New int[Newarr.length];//the product <9 of odd digit -         int[] arrSingleNum2 =New int[Newarr.length];//the product >9 of odd digit About         int[] arrdoublenum=New int[Newarr.length];//array of even digits $          -          for(intj = 0;j < Newarr.length; J + +){ -             if((j+1)%2==1) {//Odd digits -                 if((int) (newarr[j]-48) *2<9) AArrsinglenum[j]= (int) (newarr[j]-48) * *; +                 Else theArrsinglenum2[j]= (int) (newarr[j]-48) * *; -             } $             Else //even digits theArrdoublenum[j]= (int) (newarr[j]-48); the         } the          the         int[] Arrsinglenumchild =New int[Newarr.length];//Odd Digit * * >9 after the split of the array single digit -         int[] Arrsinglenum2child =New int[Newarr.length];//Odd Digit * * >9 array 10-bit number after the split in          the          for(inth=0;h<arrsinglenum2.length;h++){ theARRSINGLENUMCHILD[H] = (Arrsinglenum2[h])%10; AboutARRSINGLENUM2CHILD[H] = (arrsinglenum2[h])/10; the         }     the          the         intsumsinglenum=0;//the sum of an array of odd digits, < 9 +         intsumdoublenum=0;//The sum of an even-bit array -         intSumsinglenumchild=0;//The sum of the single digits of the array after the >9 of odd digits the         intSumsinglenum2child=0;//The sum of 10 digits of the array after the >9 of odd digitsBayi         intSumtotal=0; the          for(intm=0;m<arrsinglenum.length;m++){ thesumsinglenum=sumsinglenum+Arrsinglenum[m]; -         } -          the          for(intn=0;n<arrdoublenum.length;n++){ thesumdoublenum=sumdoublenum+Arrdoublenum[n]; the         } the          -          for(intp=0;p<arrsinglenumchild.length;p++){ theSumsinglenumchild=sumsinglenumchild+Arrsinglenumchild[p]; theSumsinglenum2child=sumsinglenum2child+Arrsinglenum2child[p]; the         }      94          theSumtotal=sumsinglenum+sumdoublenum+sumsinglenumchild+Sumsinglenum2child; the          the         //Calculate Luhm Value98         intk= sumtotal%10==0?10:sumtotal%10;  About         intLuhm= 10-K; -         101         if(Lastnum = =Luhm) {102             returnSUCCESS;//Validation by103         }104         Else{ the             returnIllegal_number;106         }      107     }108     109      Public Static voidMain (string[] args) { theString bankno = "6214857110432079";111System.out.println (bankno+ ":" +Luhmcheck (Bankno)); theString bankno1 = "6212164000046323291";113System.out.println (bankno1+ ":" +Luhmcheck (Bankno1)); theString Bankno2 = "6222023104004123546"; theSystem.out.println (bankno2+ ":" +Luhmcheck (Bankno2)); the     }117}

Bank card number LUHM check Java implementation code