携程第二道编程，java无法判断输入结束
我真是服了第二题的输入了，没有给定矩阵的N，java的Scanner使用hasNextInt()无法判断输入结束
最后用了定时器强行运行逻辑后退出，通过率83.3%
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
List<Integer> list = new ArrayList();
Timer timer = new Timer();
timer.schedule(new TimerTask() {
public void run() {
int n = (int) Math.sqrt(list.size());
int[][] matrix = new int[n][n];
for (int i = 0; i < list.size(); i++) {
matrix[i / n][i % n] = list.get(i);
}
new Main().new Rotate_Image().rotate(matrix);
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
System.out.print(matrix[i][j] + " ");
}
System.out.println();
}
System.exit(0);
}
}, 2000);
while (in.hasNextInt()) {
list.add(in.nextInt());
}
} 
