private static void getUnDeNumber(int[] arr) {
int n = arr.length;
for (int j = n; j > 1; j--) {
int random = (int) (Math.random() * j);
System.out.printf("get a number:" + arr[random] + "\n");
System.arraycopy(arr, random + 1, arr, random, n - 1 - random);
arr = Arrays.copyOf(arr, n - 1);
n--;
}
}
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