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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.

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	Transforms a JAR file to or from a packed stream in Pack200 format.

JarException Signals that an error of some sort has occurred while reading from or writing to a JAR file.