Java 9宫格 判断一条线相等

private static Random sRandom = new Random();

    public static void main(String args[]) throws Exception {
        int[] arr = new int[9];
        printArr(arr);
        while (true) {
            for (int i = 0; i < arr.length; i++) {
                arr[i] = sRandom.nextInt(10);
            }
            if (isLine(arr)) {
                printArr(arr);
            }
        }
    }

    private static void printArr(int[] arr) {
        System.out.println(Arrays.toString(arr));
        for (int i = 0; i < 9; i += 3) {
            int[] array = new int[3];
            for (int j = 0; j < array.length; j++) {
                array[j] = arr[i + j];
            }
            System.out.println(Arrays.toString(array));
        }
        System.out.println("-----------------------------------");
    }

    public static boolean isLine(int[] arr) {
        //判断行
        for (int i = 0; i < 3; i += 3) {
            if (arr[i] != 0 && arr[i] == arr[i + 1] && arr[i + 1] == arr[i + 2]) {
                return true;
            }
        }

        //判断列
        for (int i = 0; i < 3; i++) {
            if (arr[i] != 0 && arr[i] == arr[i + 3] && arr[i + 3] == arr[i + 6]) {
                return true;
            }
        }

        //判断对角线
        if (arr[4] != 0 && arr[0] == arr[4] && arr[4] == arr[8]) {
            return true;
        }
        if (arr[4] != 0 && arr[2] == arr[4] && arr[4] == arr[6]) {
            return true;
        }
        return false;
    }