1. 整数，第一行输入n，第二行输入n个数

//类名一定要写成Main
class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNextInt()) {
            int n = sc.nextInt();
            //长度n
            int[] arr = new int[n];
            //n个数
            for(int i=0;i<n;i++) {
                arr[i] = sc.nextInt();
            }
        }
    }
}

2. 整数，中间有逗号“，”分隔

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        String[] strArr = s.split(",");
        int[] arr = new int[strArr.length];
        for (int i = 0; i < strArr.length; i++) {
            arr[i] = Integer.parseInt(strArr[i]);
        }
        System.out.println();
    }
}