think in java - io - input/output

# what is 'stream'?

Stream represents any data source or sink as an object capable of producing or receiving pieces of data.

#inputStream

To produce input from different sources.

# Types of InputStream

1. ByteArrayInputStream: allows a buffer in memory to be used as an inputStream.

2. StringBufferInputStram: converts a String into an inputStream.

3. FileInputStream: For reading info from a file.

4. PipedInputStream: produces the data that's being written to the associated PipedOutputStream.

5. SequenceInputStream: Combine 2 or more InputStream objects into a single.

6. FilterInputStream: abstract class that is an interface for decorators.
   

--> types of outputStream is similar to inputStream.

# types of FilterInputStream

1. DataInputStream: used to read primitives(int, char, long, etc.) from a stream.

2. BufferInputStream: to use a buffer instead of physical read every time you want more data.

3. LineNumberInputStream: keep track of line number in the inputStream.

4. PushbackInputStream: ...

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