- Java uses the concept of the stream to make I/O operations fast. The java.io package contains all the classes required for input and output operations.
- A stream is a sequence of data. In Java, a stream is composed of bytes. It's called a stream because it is like a stream of water that continues to flow.
A program that needs to read data from some source needs an InputStream or a Reader(abstract) class, one item at a time.
A program that needs to read data from some source needs an OutputStream or a Writer(abstract) class, one item at a time.
