| Package | Description | 
|---|---|
| java.io | 
 Provides for system input and output through data streams,
serialization and the file system. 
 | 
| java.rmi.server | 
 Provides classes and interfaces for supporting the server
side of RMI. 
 | 
| java.security | 
 Provides the classes and interfaces for the security framework. 
 | 
| java.util | 
 Contains the collections framework, legacy collection classes, event model,
date and time facilities, internationalization, and miscellaneous utility
classes (a string tokenizer, a random-number generator, and a bit array). 
 | 
| java.util.jar | 
 Provides classes for reading and writing the JAR (Java ARchive) file
format, which is based on the standard ZIP file format with an
optional manifest file. 
 | 
| java.util.zip | 
 Provides classes for reading and writing the standard ZIP and GZIP
file formats. 
 | 
| javax.crypto | 
 Provides the classes and interfaces for cryptographic operations. 
 | 
| javax.tools | 
 Provides interfaces for tools which can be invoked from a program,
 for example, compilers. 
 | 
| Modifier and Type | Class and Description | 
|---|---|
class  | 
BufferedOutputStream
The class implements a buffered output stream. 
 | 
class  | 
BufferedWriter
Writes text to a character-output stream, buffering characters so as to
 provide for the efficient writing of single characters, arrays, and strings. 
 | 
class  | 
ByteArrayOutputStream
This class implements an output stream in which the data is
 written into a byte array. 
 | 
class  | 
CharArrayWriter
This class implements a character buffer that can be used as an Writer. 
 | 
class  | 
Console
Methods to access the character-based console device, if any, associated
 with the current Java virtual machine. 
 | 
class  | 
DataOutputStream
A data output stream lets an application write primitive Java data
 types to an output stream in a portable way. 
 | 
class  | 
FileOutputStream
A file output stream is an output stream for writing data to a
  
File or to a FileDescriptor. | 
class  | 
FileWriter
Convenience class for writing character files. 
 | 
class  | 
FilterOutputStream
This class is the superclass of all classes that filter output
 streams. 
 | 
class  | 
FilterWriter
Abstract class for writing filtered character streams. 
 | 
class  | 
ObjectOutputStream
An ObjectOutputStream writes primitive data types and graphs of Java objects
 to an OutputStream. 
 | 
class  | 
OutputStream
This abstract class is the superclass of all classes representing
 an output stream of bytes. 
 | 
class  | 
OutputStreamWriter
An OutputStreamWriter is a bridge from character streams to byte streams:
 Characters written to it are encoded into bytes using a specified  
charset. | 
class  | 
PipedOutputStream
A piped output stream can be connected to a piped input stream
 to create a communications pipe. 
 | 
class  | 
PipedWriter
Piped character-output streams. 
 | 
class  | 
PrintStream
A  
PrintStream adds functionality to another output stream,
 namely the ability to print representations of various data values
 conveniently. | 
class  | 
PrintWriter
Prints formatted representations of objects to a text-output stream. 
 | 
class  | 
StringWriter
A character stream that collects its output in a string buffer, which can
 then be used to construct a string. 
 | 
class  | 
Writer
Abstract class for writing to character streams. 
 | 
| Modifier and Type | Class and Description | 
|---|---|
class  | 
LogStream
Deprecated. 
 
no replacement 
 | 
| Modifier and Type | Class and Description | 
|---|---|
class  | 
DigestOutputStream
A transparent stream that updates the associated message digest using
 the bits going through the stream. 
 | 
| Modifier and Type | Class and Description | 
|---|---|
class  | 
Formatter
An interpreter for printf-style format strings. 
 | 
| Modifier and Type | Class and Description | 
|---|---|
class  | 
JarOutputStream
The  
JarOutputStream class is used to write the contents
 of a JAR file to any output stream. | 
| Modifier and Type | Class and Description | 
|---|---|
class  | 
CheckedOutputStream
An output stream that also maintains a checksum of the data being
 written. 
 | 
class  | 
DeflaterOutputStream
This class implements an output stream filter for compressing data in
 the "deflate" compression format. 
 | 
class  | 
GZIPOutputStream
This class implements a stream filter for writing compressed data in
 the GZIP file format. 
 | 
class  | 
InflaterOutputStream
Implements an output stream filter for uncompressing data stored in the
 "deflate" compression format. 
 | 
class  | 
ZipOutputStream
This class implements an output stream filter for writing files in the
 ZIP file format. 
 | 
| Modifier and Type | Class and Description | 
|---|---|
class  | 
CipherOutputStream
A CipherOutputStream is composed of an OutputStream and a Cipher so
 that write() methods first process the data before writing them out
 to the underlying OutputStream. 
 | 
| Modifier and Type | Interface and Description | 
|---|---|
interface  | 
JavaFileManager
File manager for tools operating on Java™ programming language
 source and class files. 
 | 
interface  | 
StandardJavaFileManager
File manager based on java.io.File. 
 | 
| Modifier and Type | Class and Description | 
|---|---|
class  | 
ForwardingJavaFileManager<M extends JavaFileManager>
Forwards calls to a given file manager. 
 | 
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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