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Showing content from https://docs.oracle.com/javase/7/docs/api/java/util/jar/package-summary.html below:

java.util.jar (Java Platform SE 7 )

• Interface Summary  Interface Description 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.

• Class Summary  Class 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

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

• Exception Summary  Exception Description JarException

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

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. The manifest stores meta-information about the JAR file contents and is also used for signing JAR files.

The

package is based on the following specifications:

• Info-ZIP file format - The JAR format is based on the Info-ZIP file format. See java.util.zip package description.

  In JAR files, all file names must be encoded in the UTF-8 encoding.

• Manifest and Signature Specification - The manifest format specification.

Since:

1.2

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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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