MyEclipse提示过期 “Your 30-day trial of MyEclipse has expired”

import java.io.*;        
    public class MyEclipseGen {        
            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 MyEclipseGen() {        
                                                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();        
                                                        MyEclipseGen myeclipsegen = new MyEclipseGen();        
                                                        String res = myeclipsegen.getSerial(userId, "0");        
                                                        System.out.println("Serial:" + res);        
                                                        reader.readLine();        
                                                } catch (IOException ex) {        
                                                }        
                                        }        
                                }