java: Random numbers with a probability?

Based on the first answer in this question, I implemented a function that returns random numbers with a probability. However, the random numbers generated through this method are not following the probability described.

My code is given below

ArrayList<Integer> probsArray=new ArrayList<Integer>();

        int count1=(int) (type1prob*100);
        int total = 0;
        total+=count1;
        while(count1!=0){

            probsArray.add(1);
        count1--;
        }

        int count2=(int) (type2prob*100);

        total+=count2;
        while(count2!=0){

            probsArray.add(2);
        count2--;
        }

        int count3=(int) (type3prob*100);

        total+=count3;
        while(count3!=0){

            probsArray.add(3);
        count3--;
        }


        System.out.println("total is "+total);

        int randomNum= ThreadLocalRandom.current().nextInt(0, total);



    return probsArray.get(randomNum);

If I use the following input values

type1prob=0.5
type2prob=0.0
type3prob=0.5

Then the output I get is

Total type 1 = 25
Total type 2 = 0
Total type 3 = 20

There shouldnt be such a big difference between type 1 and type 3.