THE PACKAGE JAVA.LANG

java.lang.SecurityManager

20.17

20.17.18

public void checkRead(int fd)

throws SecurityException

The general contract of this method is that it should throw a

SecurityException

if creating an input stream using the specified file descriptor is not permitted.

This method is invoked for the current security manager ( 20.18.4) by one

constructor for

java.io.FileInputStream

 ( 22.4.3).

The

checkRead

 method defined by class

SecurityManager

 always throws a

SecurityException

. A subclass must override this method if creating an input

stream from an existing file descriptor is to be permitted with a security manager

installed.

20.17.19

public void checkRead(String file)

throws SecurityException

The general contract of this method is that it should throw a

SecurityException

if reading the specified file or directory, or examining associated file system infor 

mation, or testing for its existence, is not permitted.

This method is invoked for the current security manager ( 20.18.4) by two

constructors for

java.io.FileInputStream

 ( 22.4.1,  22.4.2); by two con 

structors for

java.io.RandomAccessFile

 ( 22.23.1,  22.23.2); and by methods

exists

 ( 22.24.16),

canRead

 ( 22.24.17),

isFile

 ( 22.24.19),

isDirectory

( 22.24.20),

lastModified

 ( 22.24.21),

length

 ( 22.24.22),

list

 with no argu 

ments ( 22.24.25), and

list

 with one argument ( 22.24.26) of the class

java.io.File

.

The

checkRead

 method defined by class

SecurityManager

 always throws a

SecurityException

. A subclass must override this method if read access to a

file is to be permitted with a security manager installed.

20.17.20

public void checkWrite(int fd)

throws SecurityException

The general contract of this method is that it should throw a

SecurityException

if creating an output stream using the specified file descriptor is not permitted.

This method is invoked for the current security manager ( 20.18.4) by one

constructor for

java.io.FileOutputStream

 ( 22.16.3).

The

checkWrite

 method defined by class

SecurityManager

 always throws

a

SecurityException

. A subclass must override this method if creating an out 

put stream from an existing file descriptor is to be permitted with a security man 

ager installed.

575