Java ZipFile

ZIP is a file format for compressed files or folders. It enables data compression. Using Java programming language, we can create ZIP files or folders. For this Java provides the classes In Java, ZipFile is a class that belongs to the java.util.zip package. The package provides the java.util.zip package. The package contains the number of classes that deal with the ZIP file or folder. The classes can be to read and write the standard ZIP and GZIP file formats. In this section, we will discuss the Java ZipFile class.

Java ZipFile Class

It provides fields and methods that are required to deal with the ZIP file. The class is useful if we want to read entries from a ZIP file. It implements the Closeable and AutoCloseable interfaces.

ZipFile Class Fields

The class provides the constant field's values that are public static and final.

Modifier and Type	Field
static int	CENATT
static int	CENATX
static int	CENCOM
static int	CENCRC
static int	CENDSK
static int	CENEXT
static int	CENFLG
static int	CENHDR
static int	CENHOW
static int	CENLEN
static int	CENNAM
static int	CENOFF
static long	CENSIG
static int	CENSIZ
static int	CENTIM
static int	CENVEM
static int	CENVER
static int	ENDCOM
static int	ENDHDR
static int	ENDOFF
static long	ENDSIG
static int	ENDSIZ
static int	ENDSUB
static int	ENDTOT
static int	EXTCRC
static int	EXTHDR
static int	EXTLEN
static long	EXTSIG
static int	EXTSIZ
static int	LOCCRC
static int	LOCEXT
static int	LOCFLG
static int	LOCHDR
static int	LOCHOW
static int	LOCLEN
static int	LOCNAM
static long	LOCSIG
static int	LOCSIZ
static int	LOCTIM
static int	LOCVER
static int	OPEN_DELETE Mode flag to open a zip file and mark it for deletion.
static int	OPEN_READ Mode flag to open a zip file for reading.

ZipFile Class Constructors

Passing null values to the constructors may lead to the NullPointerException.

Constructor	Description
ZipFile(File file)	It is used to open a specified file object file.
ZipFile(File file, Charset charset)	It is used to open a ZIP file for reading.
ZipFile(File file, int mode)	It opens a new ZipFile to read from the specified File object in the specified mode.
ZipFile(File file, int mode, Charset charset)	It opens a new ZipFile to read from the specified File object in the specified mode.
ZipFile(String name)	It also opens a ZIP file for reading.
ZipFile(String name, Charset charset)	It is also used to open a ZIP file for reading.

ZipFile Class Methods

The class has the following methods.

Method	Description
close()	The method closes the ZIP file.
entries()	It returns the enumeration of the ZIP file entries.
finalize()	It ensures that the system resources held by this ZipFile object are released when there are no more references to it. It overrides the finalize method of the Object class.
getComment()	It returns the ZIP file comment and returns null if the file has no comment.
getEntry()	It returns the ZIP file entry for the specified name and returns null if the entry is null.
getInputStream()	It is used to read the contents of the specified ZIP file entry and returns an input stream for the same.
getName()	It is used to get the path of the ZIP file.
size()	It is used to get the number of entries a ZIP file has.