java - buffered IO 问题

Question

        char[] array  = new char[10000];
        Arrays.fill(array,(char)1);
        PrintWriter pw = new PrintWriter(System.out);
        pw.write(array);
        pw.flush();

        char[] array  = new char[10000];
        Arrays.fill(array,(char)1);
        PrintWriter pw = new PrintWriter(System.out);
        pw.write(array);

为什么上面这两段代码都没有输出呢？

Answer 1

1不是不可见字符吗@_@