Java Doc for Observable.java in  » Apache-Harmony-Java-SE » java-package » java » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.util   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    java.util.Observable Observable public class Observable (Code) Observable is used to notify a group of Observer objects when a change occurs. Field Summary  boolean changed       List<Observer> observers      Constructor Summary public   Observable()      Constructs a new Observable object. Method Summary public  void addObserver(Observer observer)      Adds the specified Observer to the list of observers. protected  void clearChanged()      Clears the changed flag for this Observable. public  int countObservers()      Answers the number of Observers in the list of observers. public synchronized  void deleteObserver(Observer observer)      Removes the specified Observer from the list of observers. public synchronized  void deleteObservers()      Removes all Observers from the list of observers. public  boolean hasChanged()      Answers the changed flag for this Observable. public  void notifyObservers()      If hasChanged() returns true, calls the update() method for every Observer in the list of observers using null as the argument. public  void notifyObservers(Object data)      If hasChanged() returns true, calls the update() method for every Observer in the list of observers using the specified argument. protected  void setChanged()      Sets the changed flag for this Observable. Field Detail changed boolean changed(Code) observers List<Observer> observers(Code) Constructor Detail Observable public Observable()(Code) Constructs a new Observable object. Method Detail addObserver public void addObserver(Observer observer)(Code) Adds the specified Observer to the list of observers. Parameters:   observer - the Observer to add clearChanged protected void clearChanged()(Code) Clears the changed flag for this Observable. After calling clearChanged(), hasChanged() will return false. countObservers public int countObservers()(Code) Answers the number of Observers in the list of observers. the number of observers deleteObserver public synchronized void deleteObserver(Observer observer)(Code) Removes the specified Observer from the list of observers. Parameters:   observer - the Observer to remove deleteObservers public synchronized void deleteObservers()(Code) Removes all Observers from the list of observers. hasChanged public boolean hasChanged()(Code) Answers the changed flag for this Observable. true when the changed flag for this Observable is set, falseotherwise notifyObservers public void notifyObservers()(Code) If hasChanged() returns true, calls the update() method for every Observer in the list of observers using null as the argument. Afterwards calls clearChanged(). Equivalent to calling notifyObservers(null) notifyObservers public void notifyObservers(Object data)(Code) If hasChanged() returns true, calls the update() method for every Observer in the list of observers using the specified argument. Afterwards calls clearChanged(). Parameters:   data - the argument passed to update() setChanged protected void setChanged()(Code) Sets the changed flag for this Observable. After calling setChanged(), hasChanged() will return true. Methods inherited from java.lang.Object protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object object)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final public Class<? extends Object> getClass()(Code)(Java Doc) public int hashCode()(Code)(Java Doc) final public void notify()(Code)(Java Doc) final public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final public void wait(long millis, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait(long millis) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)