Random number with Probabilities

Question

I am wondering what would be the best way (e.g. in Java) to generate random numbers within a particular range where each number has a certain probability to occur or not?

Answer 1

there is one more effective way rather than getting into fractions or creating big arrays or hard coding range to 100

in your case array becomes int[]{2,3,5} sum = 10 just take sum of all the probablity run random number generator on it result = New Random().nextInt(10)

iterate over array elements from index 0 and calculate sum and return when sum is greater than return element of that index as a output

i.e if result is 6 then it will return index 2 which is no 5

this solution will scale irrespective of having big numbers or size of the range