Java.Streams.In which packages are the classes of input/output streams located?

✅ 1. java.io — Traditional I/O (Streams API)

This is the main package that contains most of the classic input/output stream classes.

🔹 Byte Streams

Type	Class Names
Input	InputStream, FileInputStream, BufferedInputStream, DataInputStream, ByteArrayInputStream, ObjectInputStream, PipedInputStream
Output	OutputStream, FileOutputStream, BufferedOutputStream, DataOutputStream, ByteArrayOutputStream, ObjectOutputStream, PipedOutputStream

🔹 Character Streams

Type	Class Names
Reader	Reader, FileReader, BufferedReader, CharArrayReader, StringReader, InputStreamReader
Writer	Writer, FileWriter, BufferedWriter, CharArrayWriter, StringWriter, OutputStreamWriter

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✅ 2. java.nio and java.nio.file — New I/O (NIO & NIO.2)

Introduced in Java 1.4 and extended in Java 7 (NIO.2), these packages contain:

• Channel classes (e.g., FileChannel, SocketChannel)
• Buffer classes (e.g., ByteBuffer, CharBuffer)
• Path, Files, FileSystems (modern file operations)
• WatchService (directory monitoring)
• Asynchronous* classes for non-blocking I/O

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🧠 Summary Table

Package	Purpose
java.io	Classic I/O streams (blocking)
java.nio	Buffers, channels, selectors
java.nio.file	Modern file system API (Path, Files, etc.)
java.nio.channels	Channels like FileChannel, SocketChannel