10.2.1 Inputstream ava public abstract int reado)throws IOException public int read (byte[] b)throws 工 EXception public long skip(long n) throws 工 EXception public int available() throws 工 EXception public void close () throws IOException10.2.1 InputStream public abstract int read() throws IOException public int read(byte[] b) throws IOException public long skip(long n) throws IOException public int available() throws IOException public void close() throws IOException