How to randomly assign 1000 to 10 numbers

Cut the rope ：
1. Declare an array , The length is 1000.
2. Produce random 9 A digital , Divide the array into 10 paragraph
3. The length of each segment adds up to 1000

The code implementation is as follows ：

    public static void main(String[] args) {
    
        boolean[] arr = new boolean[1001];
        for (int i = 0; i< 9; i++)
            arr[(int)(Math.random()*1000)] = true;
        int preNum = 0;
        int sum = 0;
        arr[arr.length - 1] = true;
        for (int i = 0; i < arr.length; i++){
    
            if (arr[i]) {
    
                System.out.println(" Numbers ：" + (i - preNum));
                sum += i - preNum;
                preNum = i;
            }
        }
        System.out.println(sum);
}

Output example ：

 Numbers ：65
 Numbers ：108
 Numbers ：116
 Numbers ：285
 Numbers ：1
 Numbers ：197
 Numbers ：49
 Numbers ：20
 Numbers ：17
 Numbers ：142
1000