为了向文件hello.txt尾加数据，下列哪个是正确创建指向hello.txt的流?

A. try { OutputStream out = new FileOutputStream ("hello.txt"); }catch(IOException e){ }
B. try { OutputStream out = new FileOutputStream ("hello.txt",true);}catch(IOException e){ }
C. try { OutputStream out = new FileOutputStream ("hello.txt" ,false);}catch(IOException e){ }
D. try { OutputStream out = new OutputStream ("hello.txt" ,true);}catch(IOException e){ }

FileInputStream流的read方法和FileReader流的read方法有何不同?

BufferedReader流能直接指向一个文件吗?

使用ObjectInputStream 和ObjectOutputStream类有哪些注意事项?

怎样使用输入、输出流克隆对象?