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import com.sun.org.apache.bcel.internal.classfile.ClassParser;import com.sun.org.apache.bcel.internal.classfile.JavaClass;import com.sun.org.apache.bcel.internal.classfile.Method;import com.sun.org.apache.bcel.internal.classfile.Field;import com.sun.org.apache.bcel.internal.classfile.Attribute;import com.sun.org.apache.bcel.internal.generic.*;import com.sun.org.apache.bcel.internal.util.InstructionFinder;import com.sun.org.apache.bcel.internal.Constants;import java.lang.instrument.ClassFileTransformer;import java.security.ProtectionDomain;import java.io.ByteArrayInputStream;import java.util.Iterator;public class Transformer implements ClassFileTransformer{ gui mainFrame	= new gui();    public byte[] transform(            ClassLoader loader,            String className,            Class<?> classBeingRedefined,            ProtectionDomain protectionDomain,            byte[] classFileBuffer)    {       // mainFrame.add("Starting javaagent");        if (className.equals("Math"))        {            try            {                ClassGen clazz = new ClassGen(new ClassParser(new ByteArrayInputStream(classFileBuffer), null).parse());                ConstantPoolGen cpg = clazz.getConstantPool();                for (Method m : clazz.getMethods())                {                    if(m.getName().equals("random"))                    {                        mainFrame.add("Found the Math class and the random() function");//                    MethodGen methodGen = new MethodGen(m, className,cpg);//                    InstructionList il = methodGen.getInstructionList();//                    Iterator<InstructionHandle> ilit = il.iterator();//                    while (ilit.hasNext())//                    {//                        Instruction instruction = ilit.next().getInstruction();//                        if (instruction instanceof SIPUSH)//                        {//                            int val = ((SIPUSH) (instruction)).getValue().intValue();//                            if (val < 400 || val > 800 || val == 503 || val == 765)//                            {//                                continue;//                            }//                            mainFrame.add("Client Version: "+ val);//                        }//                    }                    }                }       // !for            }        // !try            catch (Exception e)            {                e.printStackTrace();                return classFileBuffer;            }        }        return classFileBuffer;    }   // !function}   // !class