return null;
throw new NoClassDefFoundError(name);
    public static ClassFile forName(String name)    {	ClassFile cf = (ClassFile)cache.get(name);	if(cf != null)	    return cf;	for(int i = 0; i < classpath.length; i++)	{	    cf = classpath[i].load(name);	    if(cf != null)	    {		cache.put(name, cf);		return cf;	    }	}	return null;    }