MyEclipse自动生成注册码的java类

将以下内容复制Eclipse中运行，随意输入一个用户名，程序会自动计算出注册码，绝对能用！！！
 package sun;  
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();  &n