File « File « File Stream

Constants from File class

Return	Field	Summary
static String	pathSeparator	The system-dependent path-separator character, represented as a string for convenience.
static char	pathSeparatorChar	The system-dependent path-separator character.
static String	separator	The system-dependent default name-separator character, represented as a string for convenience.
static char	separatorChar	The system-dependent default name-separator character.

Create file object

Constructor	Summary
File(File parent, String child)	Creates a new File instance from a parent abstract pathname and a child pathname string.
File(String pathname)	Creates a new File instance by converting the given pathname string into an abstract pathname.
File(String parent, String child)	Creates a new File instance from a parent pathname string and a child pathname string.
File(URI uri)	Creates a new File instance by converting the given file: URI into an abstract pathname.

Is it executable, readable or writable

Return	Method	Summary
boolean	canExecute()	Tests whether the application can execute the file denoted by this abstract pathname.
boolean	canRead()	Tests whether the application can read the file denoted by this abstract pathname.
boolean	canWrite()	Tests whether the application can modify the file denoted by this abstract pathname.

Compare two file path

Return	Method	Summary
int	compareTo(File pathname)	Compares two abstract pathnames lexicographically.
boolean	equals(Object obj)	Tests this abstract pathname for equality with the given object.

Create a file

Return	Method	Summary
boolean	createNewFile()	Atomically creates a new, empty file named by this abstract pathname if and only if a file with this name does not yet exist.
static File	createTempFile(String prefix, String suffix)	Creates an empty file in the default temporary-file directory, using the given prefix and suffix to generate its name.
static File	createTempFile(String prefix, String suffix, File directory)	Creates a new empty file in the specified directory, using the given prefix and suffix strings to generate its name.

Delete a file

Return	Method	Summary
boolean	delete()	Deletes the file or directory denoted by this abstract pathname.
void	deleteOnExit()	Requests that the file or directory denoted by this abstract pathname be deleted when the virtual machine terminates.

Is it a file or a directory

Return	Method	Summary
boolean	isDirectory()	Tests whether the file denoted by this abstract pathname is a directory.
boolean	isFile()	Tests whether the file denoted by this abstract pathname is a normal file.

Whether the file or directory denoted by this abstract pathname exists

Return	Method	Summary
boolean	exists()	Tests whether the file or directory denoted by this abstract pathname exists.

Whether this abstract pathname is absolute

Return	Method	Summary
boolean	isAbsolute()	Tests whether this abstract pathname is absolute.

Is this file hidden

Return	Method	Summary
boolean	isHidden()	Tests whether the file named by this abstract pathname is a hidden file.

Get the file last modified time

Return	Method	Summary
long	lastModified()	Returns the time that the file denoted by this abstract pathname was last modified.

Get the file size

Return	Method	Summary
long	length()	Returns the length of the file denoted by this abstract pathname.

Get file path and name

Return	Method	Summary
File	getAbsoluteFile()	Returns the absolute form of this abstract pathname.
String	getAbsolutePath()	Returns the absolute pathname string of this abstract pathname.
File	getCanonicalFile()	Returns the canonical form of this abstract pathname.
String	getCanonicalPath()	Returns the canonical pathname string of this abstract pathname.
String	getName()	Returns the name of the file or directory denoted by this abstract pathname.
String	getPath()	Converts this abstract pathname into a pathname string.

Get free space, total space, usable space

Return	Method	Summary
long	getFreeSpace()	Returns the number of unallocated bytes in the partition named by this abstract path name.
long	getTotalSpace()	Returns the size of the partition named by this abstract pathname.
long	getUsableSpace()	Returns the number of bytes available to this virtual machine on the partition named by this abstract pathname.

Get parent file

Return	Method	Summary
String	getParent()	Returns the pathname string of this abstract pathname's parent, or null if this pathname does not name a parent directory.
File	getParentFile()	Returns the abstract pathname of this abstract pathname's parent, or null if this pathname does not name a parent directory.

Return file in a directory

Return	Method	Summary
String[]	list()	Returns an array of strings naming the files and directories in the directory denoted by this abstract pathname.
String[]	list(FilenameFilter filter)	Returns an array of strings naming the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter.
File[]	listFiles()	Returns an array of abstract pathnames denoting the files in the directory denoted by this abstract pathname.
File[]	listFiles(FileFilter filter)	Returns an array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter.
File[]	listFiles(FilenameFilter filter)	Returns an array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter.
static File[]	listRoots()	List the available filesystem roots.

Create new directories

Return	Method	Summary
boolean	mkdir()	Creates the directory.
boolean	mkdirs()	Creates the directory, including any necessary but nonexistent parent directories.

Rename file

Return	Method	Summary
boolean	renameTo(File dest)	Renames the file denoted by this abstract pathname.

Change to executable, readable, writable

Return	Method	Summary
boolean	setExecutable(boolean executable)	A convenience method to set the owner's execute permission for this abstract pathname.
boolean	setExecutable(boolean executable, boolean ownerOnly)	Sets the owner's or everybody's execute permission for this abstract pathname.
boolean	setLastModified(long time)	Sets the last-modified time of the file or directory named by this abstract pathname.
boolean	setReadable(boolean readable)	A convenience method to set the owner's read permission for this abstract pathname.
boolean	setReadable(boolean readable, boolean ownerOnly)	Sets the owner's or everybody's read permission for this abstract pathname.
boolean	setReadOnly()	Marks the file or directory named by this abstract pathname so that only read operations are allowed.
boolean	setWritable(boolean writable)	A convenience method to set the owner's write permission for this abstract pathname.
boolean	setWritable(boolean writable, boolean ownerOnly)	Sets the owner's or everybody's write permission for this abstract pathname.