错误代码：

public class Main {
    public static void main(String[] args)throws Exception {
        StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
        long s = 0;
        st.nextToken(); int n = (int) st.nval;
        while (n-- > 0) {
            st.nextToken(); long t = (long) st.nval;
            s ^= t;
        }
        System.out.println(s + " 0");
    }
}

把StreamTokenizer输入替换成scanner后，其他逻辑不变可以ac,求助大佬，为什么换成scanner输入答案就对了？