read() method reads a byte at a time.
This is less than perfectly efficient. The following two
overloaded variants read multiple bytes into an array of bytes.
It's more efficient to read multiple bytes at a time:
public int read(byte[] data) throws IOException
public int read(byte[] data, int offset, int length) throws IOException
These methods block until there is some data available. Then
they read as many bytes as they can into b, or
until they've read length bytes.
Each returns the number of bytes actually read or -1 on end of stream.