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JavaTM 2 Platform
Standard Edition

java.lang.reflect
Class AccessibleObject

java.lang.Object
  |
  +--java.lang.reflect.AccessibleObject
Direct Known Subclasses:
Constructor, Field, Method

public class AccessibleObject
extends Object

The AccessibleObject class is the base class for Field, Method and Constructor objects. It provides the ability to flag a reflected object as suppressing default Java language access control checks when it is used. The access checks--for public, default (package) access, protected, and private members--are performed when Fields, Methods or Constructors are used to set or get fields, to invoke methods, or to create and initialize new instances of classes, respectively.

Setting the accessible flag in a reflected object permits sophisticated applications with sufficient privilege, such as Java Object Serialization or other persistence mechanisms, to manipulate objects in a manner that would normally be prohibited.

Since:
JDK1.2
See Also:
Field, Method, Constructor, ReflectPermission

Constructor Summary
protected AccessibleObject()
          Constructor: only used by the Java Virtual Machine.
 
Method Summary
 boolean isAccessible()
          Get the value of the accessible flag for this object.
static void setAccessible(AccessibleObject[] array, boolean flag)
          Convenience method to set the accessible flag for an array of objects with a single security check (for efficiency).
 void setAccessible(boolean flag)
          Set the accessible flag for this object to the indicated boolean value.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

AccessibleObject

protected AccessibleObject()
Constructor: only used by the Java Virtual Machine.
Method Detail

setAccessible

public static void setAccessible(AccessibleObject[] array,
                                 boolean flag)
                          throws SecurityException
Convenience method to set the accessible flag for an array of objects with a single security check (for efficiency).

First, if there is a security manager, its checkPermission method is called with a ReflectPermission("suppressAccessChecks") permission.

Parameters:
array - the array of AccessibleObjects
flag - the new value for the accessible flag in each object
Throws:
SecurityException - if the request is denied.
See Also:
SecurityManager.checkPermission(java.security.Permission), RuntimePermission

setAccessible

public void setAccessible(boolean flag)
                   throws SecurityException
Set the accessible flag for this object to the indicated boolean value. A value of true indicates that the reflected object should suppress Java language access checking when it is used. A value of false indicates that the reflected object should enforce Java language access checks.

First, if there is a security manager, its checkPermission method is called with a ReflectPermission("suppressAccessChecks") permission.

Parameters:
flag - the new value for the accessible flag
Throws:
SecurityException - if the request is denied.
See Also:
SecurityManager.checkPermission(java.security.Permission), RuntimePermission

isAccessible

public boolean isAccessible()
Get the value of the accessible flag for this object.

JavaTM 2 Platform
Standard Edition

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