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

Random number generators are really only pseudo-random. That is, they use deterministic means to generate sequences that appear random given certain statistical criteria.

The Random(long seed) constuctor allows you to pass in a seed that determines the sequence of pseudo-random numbers.