public class Main {

    public static void main(String[] args) {
        int countOnes = 0;
        int countTwos = 0;
        int countThrees = 0;
        for (int i = 0; i < 10_000; i++) {
            switch(drawRandomNumber()) {
                case 1:
                    countOnes++;
                    break;
                case 2:
                    countTwos++;
                    break;
                case 3:
                    countThrees++;
            }
        }

        NumberFormat nf = NumberFormat.getPercentInstance(Locale.ENGLISH);


        System.out.println("TEST_1 (10_000 loops):");
        System.out.println("1 returned: " + nf.format(countOnes/10_000.0));
        System.out.println("2 returned: " +nf.format(countTwos/10_000.0));
        System.out.println("3 returned: " +nf.format(countThrees/10_000.0));

        countOnes = 0;
        countTwos = 0;
        countThrees = 0;

        for (int i = 0; i < 60_000; i++) {
            switch(drawRandomNumber()) {
                case 1:
                    countOnes++;
                    break;
                case 2:
                    countTwos++;
                    break;
                case 3:
                    countThrees++;
            }
        }


        System.out.println("TEST_2 (60_000 loops):");
        System.out.println("1 returned: " + nf.format(countOnes/60_000.0));
        System.out.println("2 returned: " +nf.format(countTwos/60_000.0));
        System.out.println("3 returned: " +nf.format(countThrees/60_000.0));

    }

    public static int drawRandomNumber(){
        double x = (Math.random()*((100 - 0)+1))+0;
        if (x < 20)
            return 1;
        else if (x < 50)
            return 2;
        else
            return 3;
    }

}