Java randomly generated code for credit card number __java

Import java.util.List;
Import Java.util.Stack;

Import Java.util.Vector; /** * the license below. Obviously, this isn't a Javascript credit card number * Generator.
 However, the following class is a port of a Javascript credit card * Number generator. * * @author robweber * * */public class Randomcreditcardnumbergenerator {/* Javascript credit card number GE Nerator Copyright (C) 2006-2012 Graham King * * * is free software;
     Can redistribute it and/or modify it * under the terms of the GNU general public License as published by the * Free Software Foundation;
     Either version 2 of the License, or (at your * option) any later version. * * This are distributed in the hope that it'll be useful, but * without any WARRANTY; Without even the implied warranty of * merchantability or FITNESS for A particular purpose.
     License for more details. * * You should haveReceived a copy of the GNU general public License along * and this program;
     If not, write to the free Software Foundation, Inc., * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
            * * Www.darkcoding.net/public static final string[] Visa_prefix_list = new string[] {"4539",

    "4556", "4916", "4532", "4929", "40240071", "4485", "4716", "4"};

    public static final string[] Mastercard_prefix_list = new string[] {"51", "52", "53", "54", "55"};

    public static final string[] Amex_prefix_list = new string[] {"34", "37"};

    public static final string[] Discover_prefix_list = new string[] {"6011"};

    public static final string[] Diners_prefix_list = new string[] {"300", "301", "302", "303", "36", "38"};

    public static final string[] Enroute_prefix_list = new string[] {"2014", "2149"};

    public static final string[] Jcb_prefix_list = new string[] {"35"}; public staticFinal string[] voyager_prefix_list = new string[] {"8699"};
        static string Strrev (String str) {if (str = null) return "";
        String revstr = "";
        for (int i = Str.length ()-1; I >= 0; i--) {revstr + = Str.charat (i);
    return revstr;
     }/* ' prefix ' is the start of the CC number as a string and any number of digits. * ' Length ' is the length of the CC number to generate. typically or */static string Completed_number (string prefix, int length) {String ccnumber = Pref

        ix Generate digits while (Ccnumber.length () < (length-1)) {ccnumber + = new Double Math.floor (Ma
        Th.random ()). Intvalue ();

        }//Reverse number and convert to int String reversedccnumberstring = Strrev (Ccnumber);
        list<integer> reversedccnumberlist = new vector<integer> (); for (int i = 0; i < REVERSEDCCNUMBERSTRING.LEngth (); i++) {Reversedccnumberlist.add (new Integer (String. valueof Reversedccnumberstring.charat (
        i)));
        //calculate sum int sum = 0;

        int pos = 0;
        integer[] Reversedccnumber = reversedccnumberlist. ToArray (New Integer[reversedccnumberlist.size ());
            while (Pos < length-1) {int odd = Reversedccnumber[pos] * 2;
            if (Odd > 9) {odd = 9;

            sum + = odd;
            if (Pos!= (length-2)) {sum = + Reversedccnumber[pos + 1];
        POS + 2;  }//calculate check digit int checkdigit = new Double ((Math.floor (SUM/10) + 1) * 10
        -sum). Intvalue ();

        Ccnumber + = Checkdigit;

    return ccnumber; public static string[] Credit_card_number (string[] prefixlist, int length, int howmany) {Stac K<string> result = new stack<string> ();
                    for (int i = 0; i < Howmany i++) {int randomarrayindex = (int) Math.floor (Math.random ()
            * prefixlist.length);
            String ccnumber = Prefixlist[randomarrayindex];
        Result.push (Completed_number (ccnumber, length));
    Return Result.toarray (New String[result.size ()); public static string[] Generatemastercardnumbers (int howmany) {return Credit_card_number (mastercard_prefix
    _list, Howmany); public static String Generatemastercardnumber () {return Credit_card_number (mastercard_prefix_list, 16, 1) [
    0];

        public static Boolean IsValidCreditCardNumber (String creditcardnumber) {Boolean isValid = false;
            try {String reversednumber = new StringBuffer (creditcardnumber). Reverse (). toString ();
            int mod10count = 0; for (int i = 0; i < Reversednumber.lengTh ();
                i++) {int augend = Integer.parseint (string.valueof (reversednumber. charAt (i)));
                    if (((i + 1)% 2) = = 0) {String productstring = string.valueof (Augend * 2);
                    augend = 0; for (int j = 0; J < Productstring.length (); j + +) {augend + = Integer.parseint (string.valueof PR
                    Oductstring. CharAt (j)));
            } Mod10count + = Augend;
            } if ((mod10count%) = = 0) {IsValid = true;
    The catch (NumberFormatException e) {} return isValid;
        public static void Main (string[] args) {int howmany = 0;
        try {howmany = Integer.parseint (Args[0]); The catch (Exception e) {system.err. println ("Usage error. Need to supply a numericArgument (ex:500000) ");
        } string[] Creditcardnumbers = Generatemastercardnumbers (Howmany);
                    for (int i = 0; i < creditcardnumbers.length i++) {System.out.println (creditcardnumbers[i) + ":" + (IsValidCreditCardNumber (creditcardnumbers[i])?
        Valid ":" Invalid "));
 }}//The code fragment is from: http://www.sharejs.com/codes/java/7103