Java IO stream to file operations

Check if the file exists

Get file path

Get File size

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More reference Manuals

//Operations on Files//Check if the file exists//Get file path//Get File Size//whether the file is readable//whether the file is writable//....ImportJava.io.*;ImportJava.util.*; Public classindex{ Public Static voidMain (string[] args)throwsexception{File WJ=NewFile ("D:/333.ape"); //whether the exists file exists        if(Wj.exists ()) {System.out.println ("File path:" +wj.getabsolutepath ());//Read file pathSYSTEM.OUT.PRINTLN ("File Size:" +wj.length ());//Read File sizeSystem.out.println ("Readable:" +wj.canread ());//whether the file is readableSYSTEM.OUT.PRINTLN ("Whether writable:" +wj.canwrite ());//whether the file is writable        }        Else{System.out.println ("File does not exist"); }                    }}

Method Summary

boolean	canExecute() Tests whether the application can execute the file represented by this abstract path name.
boolean	canRead() Tests whether the application can read the file represented by this abstract pathname.
boolean	canWrite() Tests whether the application can modify the file represented by this abstract pathname.
int	compareTo(File pathname) Compares two abstract path names in alphabetical order.
boolean	createNewFile() When and only if there is no file with the name specified by this abstract pathname, a new empty file is not created.
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 string to generate its name.
boolean	delete() Deletes the file or directory represented by this abstract path name.
void	deleteOnExit() When the virtual machine terminates, the request deletes the file or directory represented by this abstract path name.
boolean	equals(Object obj) Tests whether this abstract path name is equal to a given object.
boolean	exists() Tests whether the file or directory represented by this abstract path name exists.
File	getAbsoluteFile() Returns the absolute pathname form for this abstract path name.
String	getAbsolutePath() Returns the absolute path name string for this abstract pathname.
File	getCanonicalFile() Returns the canonical form of this abstract path name.
String	getCanonicalPath() Returns the canonical pathname string for this abstract path name.
long	getFreeSpace() Returns the number of unallocated bytes in the partition specified by this abstract path name.
String	getName() Returns the name of the file or directory represented by this abstract path name.
String	getParent() Returns the pathname string for this abstract pathname parent directory, or returns if this pathname does not specify a parent directory null .
File	getParentFile() Returns the abstract pathname of the parent directory for this abstract pathname, or returns if the path name does not specify a parent directory null .
String	getPath() Converts this abstract path name to a pathname string.
long	getTotalSpace() Returns the partition size specified by this abstract path name.
long	getUsableSpace() Returns the number of bytes available to this virtual machine on the partition specified by this abstract path name.
int	hashCode() Computes the hash code for this abstract path name.
boolean	isAbsolute() Tests whether this abstract path name is an absolute pathname.
boolean	isDirectory() Tests whether the file represented by this abstract path name is a directory.
boolean	isFile() Tests whether the file represented by this abstract path name is a standard file.
boolean	isHidden() Tests whether the file specified by this abstract path name is a hidden file.
long	lastModified() Returns the time of the last modification of the file represented by this abstract path name.
long	length() Returns the length of the file represented by this abstract path name.
String[]	list() Returns an array of strings that specify the files and directories in the directory represented by this abstract pathname.
String[]	list(FilenameFilter filter) Returns an array of strings that specify the files and directories in the directory that this abstract path name represents to satisfy the specified filter.
File[]	listFiles() Returns an abstract path to the an array group that represents the files in the directory represented by this abstract path name.
File[]	listFiles(FileFilter filter) Returns an abstract path to the an array group, which represents the files and directories in the directory that this abstract path name represents for the specified filter.
File[]	listFiles(FilenameFilter filter) Returns an abstract path to the an array group, which represents the files and directories in the directory that this abstract path name represents for the specified filter.
static File[]	listRoots() Lists the available file system roots.
boolean	mkdir() Creates the directory specified by this abstract path name.
boolean	mkdirs() Creates the directory specified by this abstract pathname, including all required but nonexistent parent directories.
boolean	renameTo(File dest) Renames the file represented by this abstract path name.
boolean	setExecutable(boolean executable) A convenient way to set this abstract path name owner to execute permissions.
boolean	setExecutable(boolean executable, boolean ownerOnly) Sets the execution permissions for the owner or all users of this abstract pathname.
boolean	setLastModified(long time) Sets the last modification time of the file or directory specified by this abstract path name.
boolean	setReadable(boolean readable) A convenient way to set the Read permission for this abstract pathname owner.
boolean	setReadable(boolean readable, boolean ownerOnly) Sets the Read permission for the owner or all users of this abstract path name.
boolean	setReadOnly() Marks the file or directory specified by this abstract pathname so that it can be read only.
boolean	setWritable(boolean writable) A convenient way to set this abstract pathname owner write permission.
boolean	setWritable(boolean writable, boolean ownerOnly) Sets the write permission for the owner or all users of this abstract path name.
String	toString() Returns the path name string for this abstract pathname.
URI	toURI() Constructs a file: URI that represents the name of this abstract pathname.
URL	toURL() is obsolete. This method does not automatically escape illegal characters in the URL. It is recommended that the new code convert the abstract pathname to a URL by first toURI converting it to a URI by method, and then URI.toURL reloading the URI as a URL by means of the method.

Java IO stream to file operations