How to randomly generate a certain number of numbers?

Question

Java

I have the number of people (133) and the number of floors (12). And I need to randomly but evenly "place" these people on the floors, i.e. 12(1st floor), 8(2nd floor), 9, 11, 14...

Answer 1

random but uniform

So randomly or uniformly?
I assume that you will be satisfied with the following algorithm:
For each person (out of 133) in the cycle, randomly select a floor (from 1 to 12).
For each floor, we summarize how many people got there.

Answer 2

HashMap<Integer, Integer> map = new HashMap<>();
    
    for (int i = 1; i <=12; i++) {
      map.put(i, 0);
    }
    
    for (int i = 1; i <= 133; i++) {
      int floor = (int) (1 + Math.random()*12);
      map.put(floor, map.get(floor).intValue()+1);
    }