Greg Charles wrote:Question 15: shows a run command as java Copier.java, but it should just be java Copier.
Either is right. Single file source code execution allows you to pass the .java filename to java if you don't compile.
Greg Charles wrote:Question 52: says null can't be inserted into a TreeSet, which is true is in the default case, but not universally true.
Yuck, you are right. I've added this to our list of things to decide if we want to change next time.