Java Exer0908 从键盘输入皆为正整数的数组元素，数组长度不确定，请找出数组中重复的数字并输出。

import java.util.Scanner;
public class Exer0908 {
    public static void main(String[] args) {
        System.out.println("请出入正整数，并以,隔开");
        Scanner scan = new Scanner(System.in);
        String str = scan.next().toString();
        String arr[] = str.split(",");
        int[] array = new int[arr.length];
        for (int i = 0; i < array.length ; i++) {
            array[i] = Integer.parseInt(arr[i]);
        }
        for (int i = 0; i < array.length - 1; i++) {
            for (int j = 0; j < array.length - 1 - i; j++) {
                if (array[j] > array[j + 1]){
                    int temp = array[j];
                    array[j] = array[j + 1];
                    array[j + 1] = temp;
                }
            }
        }
        int count = 0;
        System.out.print("重复数字为：");
        for (int i = 0; i <array.length - 1; i++) {
            if (array[i] == array[i + 1]){
                System.out.print(array[i] + "\t");
                count++;
            }
        }
        if (count == 0){
            System.out.println("无重复数字");
        }
    }
}

请出入正整数，并以,隔开
9,2,7,8,4,2,7
重复数字为：2	7