Java I/O Streams

I/O Streams (Input/Output Streams)

You've already seen how to create, read, and write simple text files.

In Java, there is an important difference between working with the File class and working with I/O Streams (Input/Output Stream):

• The File class (from java.io) is used to get information about files and directories:
  • Does the file exist?
  • What is its name or size?
  • Create or delete files and folders

  But: the File class does not read or write the contents of the file.

So far, we have used FileWriter for writing text and Scanner for reading text. These are easy to use, but they are mainly designed for simple text files.

I/O Streams are more flexible, because they work with text and binary data (like images, audio, PDFs).

Types of Streams

• Byte Streams
  Work with raw binary data (like images, audio, and PDF files).
  Examples: FileInputStream, FileOutputStream.


• Character Streams
  Work with text (characters and strings). These streams automatically handle character encoding.
  Examples: FileReader, FileWriter, BufferedReader, BufferedWriter.

Tip: Use character streams when working with text, and byte streams when working with binary data.