Java random numbers not random?

Question

I was trying to explain the random number generator in Java to a friend when he kept getting the same numbers every time he ran the program. I created my own simpler version

Answer 1

This:

   Random rand = new Random(100);

You're giving the random number generator the same seed (100) each time you start the program. Give it something like the output from System.currentTimeMillis() and that should give you different numbers for each invocation.