| 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  | BufferedOutputStreamThe class implements a buffered output stream. | 
| class  | BufferedWriterWrites text to a character-output stream, buffering characters so as to
 provide for the efficient writing of single characters, arrays, and strings. | 
| class  | ByteArrayOutputStreamThis class implements an output stream in which the data is
 written into a byte array. | 
| class  | CharArrayWriterThis class implements a character buffer that can be used as an Writer. | 
| class  | ConsoleMethods to access the character-based console device, if any, associated
 with the current Java virtual machine. | 
| class  | DataOutputStreamA data output stream lets an application write primitive Java data
 types to an output stream in a portable way. | 
| class  | FileOutputStreamA file output stream is an output stream for writing data to a
  Fileor to aFileDescriptor. | 
| class  | FileWriterConvenience class for writing character files. | 
| class  | FilterOutputStreamThis class is the superclass of all classes that filter output
 streams. | 
| class  | FilterWriterAbstract class for writing filtered character streams. | 
| class  | ObjectOutputStreamAn ObjectOutputStream writes primitive data types and graphs of Java objects
 to an OutputStream. | 
| class  | OutputStreamThis abstract class is the superclass of all classes representing
 an output stream of bytes. | 
| class  | OutputStreamWriterAn OutputStreamWriter is a bridge from character streams to byte streams:
 Characters written to it are encoded into bytes using a specified  charset. | 
| class  | PipedOutputStreamA piped output stream can be connected to a piped input stream
 to create a communications pipe. | 
| class  | PipedWriterPiped character-output streams. | 
| class  | PrintStreamA  PrintStreamadds functionality to another output stream,
 namely the ability to print representations of various data values
 conveniently. | 
| class  | PrintWriterPrints formatted representations of objects to a text-output stream. | 
| class  | StringWriterA character stream that collects its output in a string buffer, which can
 then be used to construct a string. | 
| class  | WriterAbstract class for writing to character streams. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | LogStreamDeprecated. 
 no replacement | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | DigestOutputStreamA transparent stream that updates the associated message digest using
 the bits going through the stream. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | FormatterAn interpreter for printf-style format strings. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | JarOutputStreamThe  JarOutputStreamclass is used to write the contents
 of a JAR file to any output stream. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | CheckedOutputStreamAn output stream that also maintains a checksum of the data being
 written. | 
| class  | DeflaterOutputStreamThis class implements an output stream filter for compressing data in
 the "deflate" compression format. | 
| class  | GZIPOutputStreamThis class implements a stream filter for writing compressed data in
 the GZIP file format. | 
| class  | InflaterOutputStreamImplements an output stream filter for uncompressing data stored in the
 "deflate" compression format. | 
| class  | ZipOutputStreamThis class implements an output stream filter for writing files in the
 ZIP file format. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | CipherOutputStreamA 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  | JavaFileManagerFile manager for tools operating on Java™ programming language
 source and class files. | 
| interface  | StandardJavaFileManagerFile 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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