程序包 com.example.graphics.observer

类 ShapeSubject

java.lang.Object

com.example.graphics.observer.ShapeSubject

public class ShapeSubject
extends Object

Subject class for the Observer pattern. This maintains a list of observers and notifies them of changes.

字段概要

字段

修饰符和类型	字段	说明
private final List<ShapeObserver>	observers

构造器概要

构造器

构造器	说明
ShapeSubject()	Constructor initializes the observer list

方法概要

修饰符和类型	方法	说明
void	addObserver(ShapeObserver observer)	Add an observer to be notified of changes
void	notifyShapeAdded(Shape shape)	Notify all observers that a shape was added
void	notifyShapeModified(Shape shape)	Notify all observers that a shape was modified
void	notifyShapeRemoved(Shape shape)	Notify all observers that a shape was removed
void	removeObserver(ShapeObserver observer)	Remove an observer from the notification list

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

observers

private final List<ShapeObserver> observers

构造器详细资料

ShapeSubject

public ShapeSubject()

Constructor initializes the observer list

方法详细资料

addObserver

public void addObserver(ShapeObserver observer)

Add an observer to be notified of changes

参数:

observer - the observer to add

removeObserver

public void removeObserver(ShapeObserver observer)

Remove an observer from the notification list

参数:

observer - the observer to remove

notifyShapeAdded

public void notifyShapeAdded(Shape shape)

Notify all observers that a shape was added

参数:

shape - the shape that was added

notifyShapeRemoved

public void notifyShapeRemoved(Shape shape)

Notify all observers that a shape was removed

参数:

shape - the shape that was removed

notifyShapeModified

public void notifyShapeModified(Shape shape)

Notify all observers that a shape was modified

参数:

shape - the shape that was modified