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Showing content from https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/jar/Manifest.html below:

Manifest (Java SE 17 & JDK 17)

All Implemented Interfaces:

Cloneable

The Manifest class is used to maintain Manifest entry names and their associated Attributes. There are main Manifest Attributes as well as per-entry Attributes. For information on the Manifest format, please see the

.

Since:

1.2

See Also:

• Attributes

• Constructor Summary

  Constructors

  Constructs a new, empty Manifest.

  Constructs a new Manifest from the specified input stream.

  Constructs a new Manifest that is a copy of the specified Manifest.

• Method Summary

  void

  Clears the main Attributes as well as the entries in this Manifest.

  Returns a shallow copy of this Manifest.

  boolean

  Returns true if the specified Object is also a Manifest and has the same main Attributes and entries.

  Returns the Attributes for the specified entry name.

  Returns a Map of the entries contained in this Manifest.

  Returns the main Attributes for the Manifest.

  int

  Returns the hash code for this Manifest.

  void

  Reads the Manifest from the specified InputStream.

  void

  Writes the Manifest to the specified OutputStream.

• Constructor Details
  • Manifest

    public Manifest()

    Constructs a new, empty Manifest.

  • Manifest

    Constructs a new Manifest from the specified input stream.

    Parameters:

    is - the input stream containing manifest data

    Throws:

    IOException - if an I/O error has occurred

  • Manifest

    Constructs a new Manifest that is a copy of the specified Manifest.

    Parameters:

    man - the Manifest to copy

• Method Details
  • getMainAttributes

    Returns the main Attributes for the Manifest.

    Returns:

    the main Attributes for the Manifest

  • getEntries

    Returns a Map of the entries contained in this Manifest. Each entry is represented by a String name (key) and associated Attributes (value). The Map permits the

    null

    key, but no entry with a null key is created by

    read(java.io.InputStream)

    , nor is such an entry written by using

    write(java.io.OutputStream)

    .

    Returns:

    a Map of the entries contained in this Manifest

  • getAttributes

    Returns the Attributes for the specified entry name. This method is defined as:

          return (Attributes)getEntries().get(name)
     

    Though

    null

    is a valid

    name

    , when

    getAttributes(null)

    is invoked on a

    Manifest

    obtained from a jar file,

    null

    will be returned. While jar files themselves do not allow

    null

    -named attributes, it is possible to invoke

    getEntries()

    on a

    Manifest

    , and on that result, invoke

    put

    with a null key and an arbitrary value. Subsequent invocations of

    getAttributes(null)

    will return the just-

    put

    value.

    Note that this method does not return the manifest's main attributes; see getMainAttributes().

    Parameters:

    name - entry name

    Returns:

    the Attributes for the specified entry name

  • clear

    public void clear()

    Clears the main Attributes as well as the entries in this Manifest.

  • write

    Writes the Manifest to the specified OutputStream. Attributes.Name.MANIFEST_VERSION must be set in MainAttributes prior to invoking this method.

    Parameters:

    out - the output stream

    Throws:

    IOException - if an I/O error has occurred

    See Also:

    • getMainAttributes()

  • read

    Reads the Manifest from the specified InputStream. The entry names and attributes read will be merged in with the current manifest entries.

    Parameters:

    is - the input stream

    Throws:

    IOException - if an I/O error has occurred

  • equals public boolean equals(Object o)

    Returns true if the specified Object is also a Manifest and has the same main Attributes and entries.

    Overrides:

    equals in class Object

    Parameters:

    o - the object to be compared

    Returns:

    true if the specified Object is also a Manifest and has the same main Attributes and entries

    See Also:

    • Object.hashCode()
    • HashMap

  • hashCode

    public int hashCode()

    Returns the hash code for this Manifest.

    Overrides:

    hashCode in class Object

    Returns:

    a hash code value for this object.

    See Also:

    • Object.equals(java.lang.Object)
    • System.identityHashCode(java.lang.Object)

  • clone

    Returns a shallow copy of this Manifest. The shallow copy is implemented as follows:

         public Object clone() { return new Manifest(this); }
     

    Overrides:

    clone in class Object

    Returns:

    a shallow copy of this Manifest

    See Also:

    • Cloneable

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