# Uses of Package
java.util.jar

- Packages that use java.util.jar
  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.

- Classes in java.util.jar used by java.lang.instrument
  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`.

- Classes in java.util.jar used by java.net
  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.

- Classes in java.util.jar used by java.util.jar
  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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