public class MaskFilter
|Known Direct Subclasses|
MaskFilter is the base class for object that perform transformations on an alpha-channel mask before drawing it. A subclass of MaskFilter may be installed into a Paint. Blur and emboss are implemented as subclasses of MaskFilter.
Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
| From class
void finalize ()
Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the
finalize method to dispose of system resources or to perform other cleanup.
The general contract of
finalize is that it is invoked if and when the JavaTM virtual machine has determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, except as a result of an action taken by the finalization of some other object or class which is ready to be finalized. The
finalize method may take any action, including making this object available again to other threads; the usual purpose of
finalize, however, is to perform cleanup actions before the object is irrevocably discarded. For example, the finalize method for an object that represents an input/output connection might perform explicit I/O transactions to break the connection before the object is permanently discarded.
finalize method of class
Object performs no special action; it simply returns normally. Subclasses of
Object may override this definition.
The Java programming language does not guarantee which thread will invoke the
finalize method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks when finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of that object terminates.
finalize method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded.
finalize method is never invoked more than once by a Java virtual machine for any given object.
Any exception thrown by the
finalize method causes the finalization of this object to be halted, but is otherwise ignored.