THE PACKAGE JAVA.IO

java.io.File

22.24

22.24.21

public long lastModified() throws SecurityException

First, if there is a security manager, its

checkRead

 method ( 20.17.19) is called

with the path represented by this

File

 object as its argument.

An abstract modification time is returned. If two values returned by this

method are compared, whether for the same file or for two different files, the

smaller value represents an earlier modification time. Abstract modification times

do not necessarily bear any relationship, even monotonicity, to times returned by

the method

System.currentTimeMillis

 ( 20.18.6).

22.24.22

public long length() throws SecurityException

First, if there is a security manager, its

checkRead

 method ( 20.17.19) is called

with the path represented by this

File

 object as its argument.

The length of the file, measured in bytes, is returned.

22.24.23

public boolean mkdir() throws SecurityException

First, if there is a security manager, its

checkWrite

 method ( 20.17.21) is called

with the path represented by this

File

 object as its argument.

An attempt is made to create the directory specified by the path represented by

this

File

 object; the result is true if and only if the creation operation succeeds.

22.24.24

public boolean mkdirs() throws SecurityException

First, if there is a security manager, its

checkRead

 method ( 20.17.19) is called

with the path represented by this

File

 object as its argument.

If the directory name represented by this

File

 object has a parent directory

name ( 22.24.14), an attempt is first made to create the parent directory; if this

attempt fails, the result is

false

. Otherwise, once the parent directory has been

determined to exist, or if the path has no parent, an attempt is made to create the

directory specified by this

File

 object. The result is

true

 if and only if the cre 

ation operation succeeds.

22.24.25

public String[] list() throws SecurityException

First, if there is a security manager, its

checkRead

 method ( 20.17.19) is called

with the path represented by this

File

 object as its argument.

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