第九讲 文件操作

File

InputStream f = new FileInputStream("C:/java/hello");

File f = new File("C:/java/hello");
InputStream out = new FileInputStream(f);

OutputStream f = new FileOutputStream("C:/java/hello")

File f = new File("C:/java/hello");
OutputStream f = new FileOutputStream(f);

输入和输出流是相对于内存来说的：
写入内存叫做输入流，从内存写到文件叫输出流。