Generate set of unique random numbers in Java

Question

I want to create 10 random numbers in the range 0-500. But the problem is that I want those numbers to be unique. For 2 random numbers i could create something as the follow

Answer 1

Looks like you are storing these in individual variables. The "normal" place to store groups of items like this would usually be in a list or array.

In this case, store them in a "set" data structure instead. It will not allow duplicates.

Set documentation: http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Set.html

Set set = new HashSet();

while (set.size() < 10) {
    set.add(r.nextInt(500));
}