Java Reference
In-Depth Information
is lexicographically less than, equal to, or greater than the pathname
of the argument File . The compareTo method has two overloaded forms:
one takes a File argument and the other takes an Object argument and
so implements the Comparable interface.
Several boolean tests return information about the underlying file:
exists returns TRue if the file exists in the file system.
canRead returns true if a file exists and can be read.
canWrite returns true if the file exists and can be written.
isFile returns true if the file is not a directory or other special
type of file.
isDirectory returns TRue if the file is a directory.
isAbsolute returns true if the path is an absolute pathname.
isHidden returns TRue if the path is one normally hidden from users
on the underlying system.
All the methods that inspect or modify the actual file system are security
checked and can throw SecurityException if you don't have permission to
perform the operation. Methods that ask for the filename itself are not
security checked.
File objects have many other methods for manipulating files and direct-
ories. There are methods to inspect and manipulate the current file:
public long lastModified()
Returns a long value representing the time the file was last
modified or zero if the file does not exist.
public long length()
 
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