| 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.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. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | BufferedOutputStreamThe class implements a buffered output stream. | 
| class  | DataOutputStreamA data output stream lets an application write primitive Java data
 types to an output stream in a portable way. | 
| class  | PrintStreamA  PrintStreamadds functionality to another output stream,
 namely the ability to print representations of various data values
 conveniently. | 
| 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  | 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. | 
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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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