Java compact1, compact2, compact3 java.util.jar Class Manifest（JDK8）

Constructor Detail

• Manifest

  public Manifest()

  Constructs a new, empty Manifest.

• Manifest

  public Manifest(InputStream is)
           throws IOException

  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

  public Manifest(Manifest man)

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

  Parameters:

  man - the Manifest to copy

Method Detail

• getMainAttributes

  public Attributes getMainAttributes()

  Returns the main Attributes for the Manifest.

  Returns:

  the main Attributes for the Manifest

• getEntries

  public Map<String,Attributes> 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

  public Attributes getAttributes(String name)

  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

  public void write(OutputStream out)
             throws IOException

  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

  public void read(InputStream is)
            throws IOException

  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

  public 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