| Package | Description | 
|---|---|
| java.lang.instrument | 
 Provides services that allow Java programming language agents to instrument programs running on the JVM. 
 | 
| java.net | 
 Provides the classes for implementing networking applications. 
 | 
| 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. 
 | 
| Class and Description | 
|---|
| JarFile
 The  
JarFile class is used to read the contents of a jar file
 from any file that can be opened with java.io.RandomAccessFile. | 
| Class and Description | 
|---|
| Attributes
 The Attributes class maps Manifest attribute names to associated string
 values. 
 | 
| JarEntry
 This class is used to represent a JAR file entry. 
 | 
| JarFile
 The  
JarFile class is used to read the contents of a jar file
 from any file that can be opened with java.io.RandomAccessFile. | 
| Manifest
 The Manifest class is used to maintain Manifest entry names and their
 associated Attributes. 
 | 
| Class and Description | 
|---|
| Attributes
 The Attributes class maps Manifest attribute names to associated string
 values. 
 | 
| Attributes.Name
 The Attributes.Name class represents an attribute name stored in
 this Map. 
 | 
| JarEntry
 This class is used to represent a JAR file entry. 
 | 
| JarFile
 The  
JarFile class is used to read the contents of a jar file
 from any file that can be opened with java.io.RandomAccessFile. | 
| JarInputStream
 The  
JarInputStream class is used to read the contents of
 a JAR file from any input stream. | 
| JarOutputStream
 The  
JarOutputStream class is used to write the contents
 of a JAR file to any output stream. | 
| Manifest
 The Manifest class is used to maintain Manifest entry names and their
 associated Attributes. 
 | 
| Pack200.Packer
 The packer engine applies various transformations to the input JAR file,
 making the pack stream highly compressible by a compressor such as
 gzip or zip. 
 | 
| Pack200.Unpacker
 The unpacker engine converts the packed stream to a JAR file. 
 | 
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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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