Do you have a description of the idea,

The fact that you coded this is fabulously insane:) thank you, it made
my day :))

/tom

No, sorry but it won't work yet - too easy to get around, even if you don't
know the "secret".
Still, with a little work, it could be made harder. More <secret method I'm
not going to divulge> is required, particularly around the vulnerable try {}
catch {} block. There is also much fun to be had with
java.lang.ClassLoader.defineClass(...)

I've set X-No-Archive:Yes on this message. Any other "spoiler" replies
should do the same.

Alun Harford

import java.lang.reflect.Method;
import java.math.BigInteger;

public class Tampered
{
 \u0073\u0074\u0061\u0074\u0069\u0063
 \u0053\u0074\u0072\u0069\u006E\u0067
 \u006E\u0061\u006D\u0065\u003D\u0020
 \u0022\u0044\u006F\u0059\u0022\u002B
 \u0022\u006F\u0075\u0072\u0048\u0022
 \u002B\u0022\u006F\u006D\u0022\u002B
 \u0022\u0065\u0077\u006F\u0072\u0022
 \u002B\u0022\u006B\u0059\u006F\u0022
 \u002B\u0022\u0075\u0072\u0073\u0022
 \u002B\u0022\u0065\u006C\u0066\u0022
 \u003B\u000A\u000C\u0009\u0020\u0020
 \u0073\u0074\u0061\u0074\u0069\u0063
 \u0053\u0074\u0072\u0069\u006E\u0067
 \u006D\u006E\u0061\u006D\u0065\u003D
 \u0022\u0072\u0075\u006E\u0048\u0022
 \u002B\u0022\u006F\u006D\u0065\u0022
 \u002B\u0022\u0077\u006F\u0072\u0022
 \u002B\u0022\u006B\u0022\u003B\u000C
 \u0073\u0074\u0061\u0074\u0069\u0063
 \u0053\u0074\u0072\u0069\u006E\u0067
 \u0070\u006E\u0061\u006D\u0065\u003D
 \u0022\u0072\u0075\u006E\u0022\u003B
 \u0073\u0074\u0061\u0074\u0069\u0063
 \u0053\u0074\u0072\u0069\u006E\u0067
 \u0072\u006E\u0061\u006D\u0065\u003D
 \u0022\u007F\u0071\u0052\u0022\u003B
 static String num = "\u0034\u0039";

 public void run()
 {
   System.out.println("thanks to comp.lang.java.programmer");
 }

 public static void main(String args[]) throws Exception
 {
   try
   {
     //tamper, tamper, tamper
     //I can comment out the code below and just invoke runHomework();
     Class aClass = Class.forName(name);
     Object anObject = aClass.newInstance();
     Method method1 = aClass.getMethod(mname, (Class[])null);
     method1.invoke(anObject, (Object[])null);
     Method method2 = aClass.getMethod(pname, (Class[])null);
     method2.invoke(anObject, (Object[])null);
     Method method3 = aClass.getMethod(rname, (Class[])null);
     method3.invoke(anObject, (Object[])null);
   }
   catch(Exception e)
   {
     if(e.getStackTrace()[1].getLineNumber()
      != new BigInteger(num).intValue())
      //throw new Error("Don't tamper with my code");
      //Above line commented out so can tamper
      ; //Just needs a semi-colon
   }
 }

 public void runHomework()
 {
   System.out.println("homework specific code goes here");
 }
}