Need to add a loop [closed]

I have this JavaScript which displays x random numbers of which sum is a given number y. (120 splitted to 5 random parts currently)

I want to make it display all possible combinations of number like a list, but allow only numbers from 1-50.

import java.util.Arrays;
import java.util.HashSet;
import java.util.Random;
public class Demo {
    public static Random randNum = new Random();
    public static int[] DemoFunc(int number, int parts) {
        HashSet<Integer>set = new HashSet<Integer>();
        set.add(0);
        set.add(0);
        set.add(0);
        set.add(number);
        int arrSize = parts + 1;
        while (set.size() < arrSize) {
            set.add(1 + randNum.nextInt(number - 1));
        }
        Integer[] dividers = set.toArray(new Integer[arrSize]);
        Arrays.sort(dividers);
        int[] res = new int[parts];
        for(int i = 1, j = 0; i<dividers.length; ++i, ++j) {
            res[j] = dividers[i] - dividers[j];
        }
        return res;
    }

    public static void main(String[] args) {
        System.out.println(Arrays.toString(DemoFunc(120, 5)));
    }
}