# Class ZipFile

java.lang.Object
java.util.zip.ZipFile

All Implemented Interfaces:
  `Closeable, AutoCloseable`

Direct Known Subclasses:
  `JarFile`

public class ZipFile extends Object implements Closeable
This class is used to read entries from a ZIP file.

Unless otherwise noted, passing a `null` argument to a constructor or method in this class will cause a `NullPointerException` to be thrown.

API Note:
  To release resources used by this `ZipFile`, the `close()` method should be called explicitly or by try-with-resources. Subclasses are responsible for the cleanup of resources acquired by the subclass. Subclasses that override `Object.finalize()` in order to perform cleanup should be modified to use alternative cleanup mechanisms such as `Cleaner` and remove the overriding `finalize` method.
Since:
  1.1

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final int`
  `CENATT`
  Central directory (CEN) header internal file attributes field offset.
  `static final int`
  `CENATX`
  Central directory (CEN) header external file attributes field offset.
  `static final int`
  `CENCOM`
  Central directory (CEN) header comment length field offset.
  `static final int`
  `CENCRC`
  Central directory (CEN) header uncompressed file crc-32 value field offset.
  `static final int`
  `CENDSK`
  Central directory (CEN) header disk number start field offset.
  `static final int`
  `CENEXT`
  Central directory (CEN) header extra field length field offset.
  `static final int`
  `CENFLG`
  Central directory (CEN) header encrypt, decrypt flags field offset.
  `static final int`
  `CENHDR`
  Central directory (CEN) header size in bytes (including signature).
  `static final int`
  `CENHOW`
  Central directory (CEN) header compression method field offset.
  `static final int`
  `CENLEN`
  Central directory (CEN) header uncompressed size field offset.
  `static final int`
  `CENNAM`
  Central directory (CEN) header filename length field offset.
  `static final int`
  `CENOFF`
  Central directory (CEN) header LOC header offset field offset.
  `static final long`
  `CENSIG`
  Central directory (CEN) header signature.
  `static final int`
  `CENSIZ`
  Central directory (CEN) header compressed size field offset.
  `static final int`
  `CENTIM`
  Central directory (CEN) header modification time field offset.
  `static final int`
  `CENVEM`
  Central directory (CEN) header version made by field offset.
  `static final int`
  `CENVER`
  Central directory (CEN) header version needed to extract field offset.
  `static final int`
  `ENDCOM`
  End of central directory (END) header ZIP file comment length field offset.
  `static final int`
  `ENDHDR`
  End of central directory (END) header size in bytes (including signature).
  `static final int`
  `ENDOFF`
  End of central directory (END) header offset for the first CEN header field offset.
  `static final long`
  `ENDSIG`
  End of central directory (END) header signature.
  `static final int`
  `ENDSIZ`
  End of central directory (END) header central directory size in bytes field offset.
  `static final int`
  `ENDSUB`
  End of central directory (END) header number of entries on this disk field offset.
  `static final int`
  `ENDTOT`
  End of central directory (END) header total number of entries field offset.
  `static final int`
  `EXTCRC`
  Extra local (EXT) header uncompressed file crc-32 value field offset.
  `static final int`
  `EXTHDR`
  Extra local (EXT) header size in bytes (including signature).
  `static final int`
  `EXTLEN`
  Extra local (EXT) header uncompressed size field offset.
  `static final long`
  `EXTSIG`
  Extra local (EXT) header signature.
  `static final int`
  `EXTSIZ`
  Extra local (EXT) header compressed size field offset.
  `static final int`
  `LOCCRC`
  Local file (LOC) header uncompressed file crc-32 value field offset.
  `static final int`
  `LOCEXT`
  Local file (LOC) header extra field length field offset.
  `static final int`
  `LOCFLG`
  Local file (LOC) header general purpose bit flag field offset.
  `static final int`
  `LOCHDR`
  Local file (LOC) header size in bytes (including signature).
  `static final int`
  `LOCHOW`
  Local file (LOC) header compression method field offset.
  `static final int`
  `LOCLEN`
  Local file (LOC) header uncompressed size field offset.
  `static final int`
  `LOCNAM`
  Local file (LOC) header filename length field offset.
  `static final long`
  `LOCSIG`
  Local file (LOC) header signature.
  `static final int`
  `LOCSIZ`
  Local file (LOC) header compressed size field offset.
  `static final int`
  `LOCTIM`
  Local file (LOC) header modification time field offset.
  `static final int`
  `LOCVER`
  Local file (LOC) header version needed to extract field offset.
  `static final int`
  `OPEN_DELETE`
  Mode flag to open a ZIP file and mark it for deletion.
  `static final int`
  `OPEN_READ`
  Mode flag to open a ZIP file for reading.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `ZipFile(File file)`
  Opens a ZIP file for reading given the specified File object.
  `ZipFile(File file, int mode)`
  Opens a new `ZipFile` to read from the specified `File` object in the specified mode.
  `ZipFile(File file, int mode, Charset charset)`
  Opens a new `ZipFile` to read from the specified `File` object in the specified mode.
  `ZipFile(File file, Charset charset)`
  Opens a ZIP file for reading given the specified File object.
  `ZipFile(String name)`
  Opens a ZIP file for reading.
  `ZipFile(String name, Charset charset)`
  Opens a ZIP file for reading.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `close()`
  Closes the ZIP file.
  `Enumeration<? extends ZipEntry>`
  `entries()`
  Returns an enumeration of the ZIP file entries.
  `String`
  `getComment()`
  Returns the ZIP file comment.
  `ZipEntry`
  `getEntry(String name)`
  Returns the ZIP file entry for the specified name, or null if not found.
  `InputStream`
  `getInputStream(ZipEntry entry)`
  Returns an input stream for reading the contents of the specified ZIP file entry.
  `String`
  `getName()`
  Returns the path name of the ZIP file.
  `int`
  `size()`
  Returns the number of entries in the ZIP file.
  `Stream<? extends ZipEntry>`
  `stream()`
  Returns an ordered `Stream` over the ZIP file entries.
  `String`
  `toString()`
  Returns a string identifying this `ZipFile`, for debugging.

  ### Methods declared in class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- ## Field Details

  - ### OPEN_READ

    public static final int OPEN_READ
    Mode flag to open a ZIP file for reading.
    See Also:
      - Constant Field Values

  - ### OPEN_DELETE

    public static final int OPEN_DELETE
    Mode flag to open a ZIP file and mark it for deletion. The file will be deleted some time between the moment that it is opened and the moment that it is closed, but its contents will remain accessible via the `ZipFile` object until either the close method is invoked or the virtual machine exits.
    See Also:
      - Constant Field Values

  - ### LOCSIG

    static final long LOCSIG
    Local file (LOC) header signature.
    See Also:
      - Constant Field Values

  - ### EXTSIG

    static final long EXTSIG
    Extra local (EXT) header signature.
    See Also:
      - Constant Field Values

  - ### CENSIG

    static final long CENSIG
    Central directory (CEN) header signature.
    See Also:
      - Constant Field Values

  - ### ENDSIG

    static final long ENDSIG
    End of central directory (END) header signature.
    See Also:
      - Constant Field Values

  - ### LOCHDR

    static final int LOCHDR
    Local file (LOC) header size in bytes (including signature).
    See Also:
      - Constant Field Values

  - ### EXTHDR

    static final int EXTHDR
    Extra local (EXT) header size in bytes (including signature).
    See Also:
      - Constant Field Values

  - ### CENHDR

    static final int CENHDR
    Central directory (CEN) header size in bytes (including signature).
    See Also:
      - Constant Field Values

  - ### ENDHDR

    static final int ENDHDR
    End of central directory (END) header size in bytes (including signature).
    See Also:
      - Constant Field Values

  - ### LOCVER

    static final int LOCVER
    Local file (LOC) header version needed to extract field offset.
    See Also:
      - Constant Field Values

  - ### LOCFLG

    static final int LOCFLG
    Local file (LOC) header general purpose bit flag field offset.
    See Also:
      - Constant Field Values

  - ### LOCHOW

    static final int LOCHOW
    Local file (LOC) header compression method field offset.
    See Also:
      - Constant Field Values

  - ### LOCTIM

    static final int LOCTIM
    Local file (LOC) header modification time field offset.
    See Also:
      - Constant Field Values

  - ### LOCCRC

    static final int LOCCRC
    Local file (LOC) header uncompressed file crc-32 value field offset.
    See Also:
      - Constant Field Values

  - ### LOCSIZ

    static final int LOCSIZ
    Local file (LOC) header compressed size field offset.
    See Also:
      - Constant Field Values

  - ### LOCLEN

    static final int LOCLEN
    Local file (LOC) header uncompressed size field offset.
    See Also:
      - Constant Field Values

  - ### LOCNAM

    static final int LOCNAM
    Local file (LOC) header filename length field offset.
    See Also:
      - Constant Field Values

  - ### LOCEXT

    static final int LOCEXT
    Local file (LOC) header extra field length field offset.
    See Also:
      - Constant Field Values

  - ### EXTCRC

    static final int EXTCRC
    Extra local (EXT) header uncompressed file crc-32 value field offset.
    See Also:
      - Constant Field Values

  - ### EXTSIZ

    static final int EXTSIZ
    Extra local (EXT) header compressed size field offset.
    See Also:
      - Constant Field Values

  - ### EXTLEN

    static final int EXTLEN
    Extra local (EXT) header uncompressed size field offset.
    See Also:
      - Constant Field Values

  - ### CENVEM

    static final int CENVEM
    Central directory (CEN) header version made by field offset.
    See Also:
      - Constant Field Values

  - ### CENVER

    static final int CENVER
    Central directory (CEN) header version needed to extract field offset.
    See Also:
      - Constant Field Values

  - ### CENFLG

    static final int CENFLG
    Central directory (CEN) header encrypt, decrypt flags field offset.
    See Also:
      - Constant Field Values

  - ### CENHOW

    static final int CENHOW
    Central directory (CEN) header compression method field offset.
    See Also:
      - Constant Field Values

  - ### CENTIM

    static final int CENTIM
    Central directory (CEN) header modification time field offset.
    See Also:
      - Constant Field Values

  - ### CENCRC

    static final int CENCRC
    Central directory (CEN) header uncompressed file crc-32 value field offset.
    See Also:
      - Constant Field Values

  - ### CENSIZ

    static final int CENSIZ
    Central directory (CEN) header compressed size field offset.
    See Also:
      - Constant Field Values

  - ### CENLEN

    static final int CENLEN
    Central directory (CEN) header uncompressed size field offset.
    See Also:
      - Constant Field Values

  - ### CENNAM

    static final int CENNAM
    Central directory (CEN) header filename length field offset.
    See Also:
      - Constant Field Values

  - ### CENEXT

    static final int CENEXT
    Central directory (CEN) header extra field length field offset.
    See Also:
      - Constant Field Values

  - ### CENCOM

    static final int CENCOM
    Central directory (CEN) header comment length field offset.
    See Also:
      - Constant Field Values

  - ### CENDSK

    static final int CENDSK
    Central directory (CEN) header disk number start field offset.
    See Also:
      - Constant Field Values

  - ### CENATT

    static final int CENATT
    Central directory (CEN) header internal file attributes field offset.
    See Also:
      - Constant Field Values

  - ### CENATX

    static final int CENATX
    Central directory (CEN) header external file attributes field offset.
    See Also:
      - Constant Field Values

  - ### CENOFF

    static final int CENOFF
    Central directory (CEN) header LOC header offset field offset.
    See Also:
      - Constant Field Values

  - ### ENDSUB

    static final int ENDSUB
    End of central directory (END) header number of entries on this disk field offset.
    See Also:
      - Constant Field Values

  - ### ENDTOT

    static final int ENDTOT
    End of central directory (END) header total number of entries field offset.
    See Also:
      - Constant Field Values

  - ### ENDSIZ

    static final int ENDSIZ
    End of central directory (END) header central directory size in bytes field offset.
    See Also:
      - Constant Field Values

  - ### ENDOFF

    static final int ENDOFF
    End of central directory (END) header offset for the first CEN header field offset.
    See Also:
      - Constant Field Values

  - ### ENDCOM

    static final int ENDCOM
    End of central directory (END) header ZIP file comment length field offset.
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### ZipFile

    public ZipFile(String name) throws IOException
    Opens a ZIP file for reading.

    The UTF-8 `charset` is used to decode the entry names and comments.

    Parameters:
      `name` - the name of the ZIP file
    Throws:
      `ZipException` - if a ZIP format error has occurred
      `IOException` - if an I/O error has occurred

  - ### ZipFile

    public ZipFile(File file, int mode) throws IOException
    Opens a new `ZipFile` to read from the specified `File` object in the specified mode. The mode argument must be either `OPEN_READ` or `OPEN_READ | OPEN_DELETE`.

    The UTF-8 `charset` is used to decode the entry names and comments

    Parameters:
      `file` - the ZIP file to be opened for reading
      `mode` - the mode in which the file is to be opened
    Throws:
      `ZipException` - if a ZIP format error has occurred
      `IOException` - if an I/O error has occurred
      `IllegalArgumentException` - if the `mode` argument is invalid
    Since:
      1.3

  - ### ZipFile

    public ZipFile(File file) throws ZipException, IOException
    Opens a ZIP file for reading given the specified File object.

    The UTF-8 `charset` is used to decode the entry names and comments.

    Parameters:
      `file` - the ZIP file to be opened for reading
    Throws:
      `ZipException` - if a ZIP format error has occurred
      `IOException` - if an I/O error has occurred

  - ### ZipFile

    public ZipFile(File file, int mode, Charset charset) throws IOException
    Opens a new `ZipFile` to read from the specified `File` object in the specified mode. The mode argument must be either `OPEN_READ` or `OPEN_READ | OPEN_DELETE`.
    Parameters:
      `file` - the ZIP file to be opened for reading
      `mode` - the mode in which the file is to be opened
      `charset` - the charset to be used to decode the ZIP entry name and comment that are not encoded by using UTF-8 encoding (indicated by entry's general purpose flag).
    Throws:
      `ZipException` - if a ZIP format error has occurred
      `IOException` - if an I/O error has occurred
      `IllegalArgumentException` - if the `mode` argument is invalid
    Since:
      1.7

  - ### ZipFile

    public ZipFile(String name, Charset charset) throws IOException
    Opens a ZIP file for reading.
    Parameters:
      `name` - the name of the ZIP file
      `charset` - the charset to be used to decode the ZIP entry name and comment that are not encoded by using UTF-8 encoding (indicated by entry's general purpose flag).
    Throws:
      `ZipException` - if a ZIP format error has occurred
      `IOException` - if an I/O error has occurred
    Since:
      1.7

  - ### ZipFile

    public ZipFile(File file, Charset charset) throws IOException
    Opens a ZIP file for reading given the specified File object.
    Parameters:
      `file` - the ZIP file to be opened for reading
      `charset` - The charset to be used to decode the ZIP entry name and comment (ignored if the language encoding bit of the ZIP entry's general purpose bit flag is set).
    Throws:
      `ZipException` - if a ZIP format error has occurred
      `IOException` - if an I/O error has occurred
    Since:
      1.7

- ## Method Details

  - ### getComment

    public String getComment()
    Returns the ZIP file comment. If a comment does not exist or an error is encountered decoding the comment using the charset specified when opening the ZIP file, then `null` is returned.
    Returns:
      the comment string for the ZIP file, or null if none
    Throws:
      `IllegalStateException` - if the ZIP file has been closed
    Since:
      1.7

  - ### getEntry

    public ZipEntry getEntry(String name)
    Returns the ZIP file entry for the specified name, or null if not found.
    Parameters:
      `name` - the name of the entry
    Returns:
      the ZIP file entry, or null if not found
    Throws:
      `IllegalStateException` - if the ZIP file has been closed

  - ### getInputStream

    public InputStream getInputStream(ZipEntry entry) throws IOException
    Returns an input stream for reading the contents of the specified ZIP file entry.

    Closing this ZIP file will, in turn, close all input streams that have been returned by invocations of this method.

    API Note:
      The `InputStream` returned by this method can wrap an `InflaterInputStream`, whose `read(byte[], int, int)` method can modify any element of the output buffer.
    Parameters:
      `entry` - the ZIP file entry
    Returns:
      the input stream for reading the contents of the specified ZIP file entry or null if the ZIP file entry does not exist within the ZIP file.
    Throws:
      `ZipException` - if a ZIP format error has occurred
      `IOException` - if an I/O error has occurred
      `IllegalStateException` - if the ZIP file has been closed

  - ### getName

    public String getName()
    Returns the path name of the ZIP file.
    Returns:
      the path name of the ZIP file

  - ### toString

    public String toString()
    Returns a string identifying this `ZipFile`, for debugging.
    Overrides:
      `toString` in class `Object`
    Returns:
      a string identifying this `ZipFile`, for debugging

  - ### entries

    public Enumeration<? extends ZipEntry> entries()
    Returns an enumeration of the ZIP file entries.
    Returns:
      an enumeration of the ZIP file entries
    Throws:
      `IllegalStateException` - if the ZIP file has been closed

  - ### stream

    public Stream<? extends ZipEntry> stream()
    Returns an ordered `Stream` over the ZIP file entries. Entries appear in the `Stream` in the order they appear in the central directory of the ZIP file.
    Returns:
      an ordered `Stream` of entries in this ZIP file
    Throws:
      `IllegalStateException` - if the ZIP file has been closed
    Since:
      1.8

  - ### size

    public int size()
    Returns the number of entries in the ZIP file.
    Returns:
      the number of entries in the ZIP file
    Throws:
      `IllegalStateException` - if the ZIP file has been closed

  - ### close

    public void close() throws IOException
    Closes the ZIP file.

    Closing this ZIP file will close all of the input streams previously returned by invocations of the `getInputStream` method.

    Specified by:
      `close` in interface `AutoCloseable`
    Specified by:
      `close` in interface `Closeable`
    Throws:
      `IOException` - if an I/O error has occurred