By the way, how many people here know how how to change the property of a file to READ ONLY from MS-DOS? If you know, just raise your hands.

I think we should be flexible in evaluating other people. If one does not know an individual command or a trick, we had better not be in a hurry to rush to some negative conclusion. However, if a Java programmer cannot shoot PATH and CLASSPATH problem, I advocate to fire him/her relentlessly.