Package Behavioral.Observer

Class Subject

java.lang.Object

Behavioral.Observer.Subject

Direct Known Subclasses:

ConcreteSubject

public abstract class Subject
extends Object

Abstract class for subjects in the Observer pattern.

Constructor Summary

Constructors

Constructor	Description
Subject()	Default constructor for Subject.

Method Summary

Modifier and Type	Method	Description
void	attach(Observer observer)	Attaches an observer to the subject.
void	detach(Observer observer)	Detaches an observer from the subject.
protected void	notifyObservers(String state)	Notifies all attached observers of a change.

Methods inherited from class java.lang.Object

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

Constructor Details

Subject

public Subject()

Default constructor for Subject.

Method Details

attach

public void attach(Observer observer)

Attaches an observer to the subject.

Parameters:

observer - The observer to attach.

detach

public void detach(Observer observer)

Detaches an observer from the subject.

Parameters:

observer - The observer to detach.

notifyObservers

protected void notifyObservers(String state)

Notifies all attached observers of a change.

Parameters:

state - The updated state from the subject.