I have a big question in my mind:
I can use a seed number to generate random numbers:
Random rand = new Random(34666666);
But the thing that I cannot understand is the role of that seed. For example what is the difference of
That code with the following:
Random rand = new Random();
When you supply a specific, hard-coded seed, to the one-arg Random constructor, the random numbers that will be generated will always be the same, every time you run the program. That is needed when you need a predictable source of random numbers.
However, when you don't supply a seed, then the Random constructor will choose a seed for you, based on System.nanoTime. The random numbers will be different every time you run the program, because the seed will be different each time.
Creates a new random number generator. This constructor sets the seed of the random number generator to a value very likely to be distinct from any other invocation of this constructor.
This is important because Java's random number generator is pseudo-random; each new pseudo-random number affects the seed that is used for the next pseudo-random number that gets generated.
