int min = 10;
      int max = 20;
      ArrayList<Integer> rand = new ArrayList<>();
      for(i=0;i<10;i++){
        int rands = (int)(Math.random() * (max - min) + min);
        Boolean found = true;
        while(found){
          found = false;
          int c = 1;
          while(c<i&&!found){
            if(rand.get(c) == rands){
              found = true;
            }
            c = c+1;
          }
          if(found){
            rands = (int)(Math.random() * (max - min) + min);
          }
        }
        rand.add(rands);
        System.out.println(rand.get(i));