InputStream是FileInputStream的上層(父層)。可用FileInputStream來建立一個InputStream的方法，然後用InputStream的方法(methods)進行操作。

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

以下是InputStream的方法(methods)：

1	public void close() throws IOException{}
This method closes the file output stream. Releases any system resources associated with the file. Throws an IOException.
2	protected void finalize()throws IOException {}
This method cleans up the connection to the file. Ensures that the close method of this file output stream is called when there are no more references to this stream. Throws an IOException.
3	public int read(int r)throws IOException{}
This method reads the specified byte of data from the InputStream. Returns an int. Returns the next byte of data and -1 will be returned if it's end of file.
4	public int read(byte[] r) throws IOException{}
This method reads r.length bytes from the input stream into an array. Returns the total number of bytes read. If end of file -1 will be returned.
5	public int available() throws IOException{}
Gives the number of bytes that can be read from this file input stream. Returns an int.