Java in a Nutshell, 5th Edition [Electronic resources] نسخه متنی

This class is a
java.security.Permission that governs read and
write access to system properties with System.getProperty(
) and System.setProperty( ). A
PropertyPermission object has a name, or target,
and a comma-separated list of actions. The name of the permission is
the name of the property of interest. The action string can be
"read" for getProperty(
) access, "write" for
setProperty( ) access, or
"read,write" for both types of
access. PropertyPermission extends
java.security.BasicPermission, so the name of the
property supports simple wildcards. The name
"*" represents any property name.
If a name ends with ".*", it
represents any property names that share the specified prefix. For
example, the name "java.*"
represents "java.version",
"java.vendor",
"java.vendor.url", and all other
properties that begin with "java".

Granting access to system
properties is not overtly dangerous, but caution is still necessary.
Some properties, such as
"user.home", reveal details about
the host system that malicious code can use to mount an attack.
Programmers writing system-level code and system administrators
configuring security policies may need to use this class, but
applications never need to use it.

Figure 16-49. java.util.PropertyPermission

public final class

PropertyPermission extends java.security.BasicPermission {
// Public Constructors
public

PropertyPermission (String

name , String

actions );
// Public Methods Overriding BasicPermission
public boolean

equals (Object

obj );
public String

getActions ( );
public int

hashCode ( );
public boolean

implies (java.security.Permission

p );
public java.security.PermissionCollection

newPermissionCollection ( );
}