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A stream is an abstraction of the continuous one-way flow of data

The main byte streams are:

• InputStream/OutputStream: abstract class
• BufferedInputStream/BufferedOutputStream: the data is buffered, that means it's read ahead of time and disk or network accesses are reduced.
• DataInputStream/DataOutputStream: used to read/write primitive Java data types.
• FileInputstream/FileOutputStream: basic interface for bytes
• ObjectInputStream/ObjectOutputStream: serialize/deserializes objects.
• ByteArrayInputStream/ByteArrayOutputStream: read data from/to byte arrays
• InputStreamReader/OutputStreamWriter: bridge from byte streams to character streams
• PipedInputStream/OutputPiepedStream: used to read from or write to a piped stream, a particular type of stream on which the output of OutputPiepedStream is read by PipedInputStream

The main character streams are:

• Reader/Writer: abstract class for chars
• BufferedReader/BufferedWriter: the data is buffered so that it's possible to read line by line.
• StringReader/StringWriter: read or write from/to a string
• FileReader/FileWriter: basic interface for chars
• PrintWriter: similar to FileWriter but more sophisticated.
• PipedReader/PipedWriter: used to read from or write to a piped stream