Java.io Package in Java

This package provides for system input and output through data streams, serialization and the file system. Unless otherwise noted, passing a null argument to a constructor or method in any class or interface in this package will cause a NullPointerException to be thrown.

Following are the important classes in Java.io package:

• BufferedInputStream
• BufferedOutputStream
• BufferedReader
• BufferedWriter
• ByteArrayInputStream
• ByteArrayOutputStream
• CharArrayReader
• CharArrayWriter – Set1 Set2
• Console
• DataInputStream – Set1 Set2
• DataOutputStream
• File
• FileDescriptor
• FileInputStream
• FileOutputStream
• FilePermission
• FileReader and FileWriter
• FilterInputStream
• FilterOutputStream
• FilterReader
• FilterWriter
• InputStream
• InputStreamReader
• LineNumberInputStream
• LineNumberReader
• ObjectInputStream – Set1 Set2
• ObjectInputStream.GetField
• ObjectOutputStream – Set 1 Set2
• ObjectOutputStream.PutField
• ObjectStreamClass
• ObjectStreamField
• OutputStream
• OutputStreamWriter
• PipedInputStream
• PipedOutputStream
• PipedReader
• PipedWriter
• PrintStream – Set1   Set2
• PrintWriter – Set1  Set2
• PushbackInputStream
• PushbackReader
• RandomAccessFile- Set1 Set2 Set3
• Reader
• SequenceInputStream
• SerializablePermission
• StreamTokenizer – Set1 Set2
• StringBufferInputStream
• StringReader
• StringWriter
• Writer
• ZipInputStream class in Java
• ZipEntry class in Java
• JarEntry class in Java
• ZipOutputStream class in Java
• Zip.InflaterInputStream class in Java
• Zip.DeflaterInputStream class in Java
• Zip.DeflaterOutputStream class in Java