MyEclipse註冊機

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public class tedst {     private static final String LL = "Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of 1998 (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA, penalties range up to a $500,000 fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself.";        public String getSerial(String userId, String licenseNum) {            java.util.Calendar cal = java.util.Calendar.getInstance();            cal.add(1, 3);            cal.add(6, -1);            java.text.NumberFormat nf = new java.text.DecimalFormat("000");            licenseNum = nf.format(Integer.valueOf(licenseNum));            String verTime = new StringBuilder("-").append(                    new java.text.SimpleDateFormat("yyMMdd").format(cal.getTime()))                    .append("0").toString();            String type = "YE3MP-";            String need = new StringBuilder(userId.substring(0, 1)).append(type)            .append("300").append(licenseNum).append(verTime).toString();            String dx = new StringBuilder(need).append(LL).append(userId)            .toString();            int suf = this.decode(dx);            String code = new StringBuilder(need).append(String.valueOf(suf))            .toString();            return this.change(code);        }        private int decode(String s) {            int i;            char[] ac;            int j;            int k;            i = 0;            ac = s.toCharArray();            j = 0;            k = ac.length;            while (j < k) {                i = (31 * i) + ac[j];                j++;            }            return Math.abs(i);        }        private String change(String s) {            byte[] abyte0;            char[] ac;            int i;            int k;            int j;            abyte0 = s.getBytes();            ac = new char[s.length()];            i = 0;            k = abyte0.length;            while (i < k) {                j = abyte0[i];                if ((j >= 48) && (j <= 57)) {                    j = (((j - 48) + 5) % 10) + 48;                } else if ((j >= 65) && (j <= 90)) {                    j = (((j - 65) + 13) % 26) + 65;                } else if ((j >= 97) && (j <= 122)) {                    j = (((j - 97) + 13) % 26) + 97;                }                ac[i] = (char) j;                i++;            }            return String.valueOf(ac);        }        public tedst() {            super();        }        public static void main(String[] args) {            try {                System.out.println("please input register name:");                BufferedReader reader = new BufferedReader(new InputStreamReader(                        System.in));                String userId = null;                userId = reader.readLine();                tedst myeclipsegen = new tedst();                String res = myeclipsegen.getSerial(userId, "5");                System.out.println("Serial:" + res);                reader.readLine();            } catch (IOException ex) {            }        }}