Re: Listen for global or local variable change Programming Software Development by JamesCherrill … the Java single-inheritance problem, ie if you extend Observable you can't extend anything else, which will frequently … rather than inheritance, ie create a private instance of Observable in your class, then write one-line covers for … yourself. I would not recommend using the code in Observable as an example or code template. The code goes … Observable in TPL Dataflow Programming by nalb4242 … coming from the previous but why resources and programmers use observable and subscribe on target is that doing same as Transform… Observer Observable Programming Software Development by solomon_13000 …package com.observer3; import java.awt.FlowLayout; import java.util.Observable; import java.util.Observer; import javax.swing.JLabel; import… } package com.observer3; import java.util.Observable; public class C extends Observable{ private int count=0; public C(int… Re: Observer Observable Programming Software Development by solomon_13000 …package com.observer3; import java.awt.FlowLayout; import java.util.Observable; import java.util.Observer; import javax.swing.JFrame; import… } package com.observer3; import java.util.Observable; public class C extends Observable{ private int count=0; public C(int… Re: Observer Observable Programming Software Development by solomon_13000 … com.observer3; import java.awt.FlowLayout; import java.util.Observable; import java.util.Observer; import javax.swing.JFrame; import…} } package com.observer3; import java.util.Observable; public class C extends Observable{ private int count=0; public void setCount… java and using observable class Programming Software Development by Phaelax …f.pack(); f.show(); } /*************************************** */ public void update(Observable o, Object arg) { } /*************************************** */ private JMenu …FlowLayout(FlowLayout.LEFT)); class ButtonListener extends Observable implements ActionListener { public void actionPerformed(ActionEvent… Re: java and using observable class Programming Software Development by trajesh …f.pack(); f.show(); } /*************************************** */ public void update(Observable o, Object arg) { } /*************************************** */ private JMenu …FlowLayout(FlowLayout.LEFT)); class ButtonListener extends Observable implements ActionListener { public void actionPerformed(ActionEvent… Strange problem with Observer/Observable "update" method call. Programming Software Development by David22 …, no big problem here. However, in my update(Observable obs, Object arg) method, I am trying to …;update" method because it is a special observer/observable method? Here is what I mean: [CODE] public… void update(Observable obs, Object args){ Location loc = (Location)obs; … Re: java and using observable class Programming Software Development by orko … Because you specified you want to add observer and observable to your classes, but you did not even implemented…bergin/mvc/mvcgui.html[/url] HINTS: to make observer/observable works, you must have to notify observer about the… change is made in observable object by calling notifyObserver(); Besides, you must have … Re: Observer Observable Programming Software Development by bguild … hoping for. In order to make use of being an `Observable`, you will also need some way for `c` to change… Re: Strange problem with Observer/Observable "update" method call. Programming Software Development by ~s.o.s~ … be persisting the data in an Observer since theoretically an Observable can have multiple observers. The right place to persist updates… the source of the data change i.e. in your Observable. HTH Re: java and using observable class Programming Software Development by trajesh Also I wanted to learn about how to use observer and Observable Thank You Re: java and using observable class Programming Software Development by orko …? In that case, you should start from little beginning. Observer/Observable is little advanced level. If you already know how to… Filtering observable array in Ionic Programming Mobile Development by Mel441 … I am well and truly stuck: how to manipulate an observable array in ionic/ Angular/Typescript? The HTTP call gets the… my blindness involves how to display selected subsets from the observable array. Days of ineffective googling and looking at O'Reilly… Re: A couple of questions on Observer/Observable/ Programming Software Development by David22 … your replies. I've been playing around with the Observer/Observable stuff but I haven't had any luck that. Can… my GUI as the Observer and the Location objects as Observable. Whenever a user retrieves their watchlist, they subscribe to all… Re: A couple of questions on Observer/Observable/ Programming Software Development by JamesCherrill The Observable object has a Collection (eg ArrayList) of Observers, so the addObserver method just adds the Observer (passed as the parameter) to the Collection. so: Observer: observableObject.addObserver(this); Observable: public void addObserver(Observer o) { observers.add(o); } A couple of questions on Observer/Observable/ Programming Software Development by David22 … of my system, and it requires use of the observer/observable pattern, something I haven't a clue about! Basically, I… RxJava 3 - How to create and observe Observables Programming Software Development by dimitrilc … ## Creating an Observable ## The Observable interface (`io.reactivex.rxjava3.core.Observable`) has a lot … object received from the Observable when the Observable is completed. Now we… private static <T> void subWithConsumers(Observable<T> obs){ obs.blockingSubscribe( item… Combine RxJava Observables - mergeWith() and concatWith() Programming Software Development by dimitrilc … ObservableSource, such as SingleSource, MaybeSource, and CompletableSource, public final @NonNull Observable<T> mergeWith(@NonNull SingleSource<? extends T>… understand. The method signature for `concatWith()` is: public final @NonNull Observable<T> concatWith(@NonNull ObservableSource<? extends T>… Creating Interactive Web Interfaces with the help of Knockout.js Programming Web Development by jeffcogswell … = { main: { presidents: ko.observableArray([]) }, helpers: { newitem: { firstName: ko.observable(), lastName: ko.observable(), number: ko.observable() } } }; var datum1 = { firstName: 'George', lastName: 'Washington', number: 1… Re: Creating Interactive Web Interfaces with the help of Knockout.js Programming Web Development by jeffcogswell … the form fields. I just push the data into an observable with one line of code, and the fields get filled… Understanding observers, a simple program Programming Software Development by Violet_82 … } } //the Observer(s) import java.util.Observable; import java.util.Observer; public class BankAccountObserver implements … this.bankAccount = bankAccount; } @Override public void update(Observable o, Object arg) { if (o == bankAccount) {… Interface ... extends ... implements ... (Need help) Programming Software Development by balgarath … Observer { public void update(Observable o); } [/code] Observable.java [code] package toys; public interface Observable { public void addObserver(String s…java.rmi.RemoteException; public interface ToyFactory extends Remote implements Observable { String sayHello() throws RemoteException; public void addObserver(… Need help with an error in observer pattern implementation Programming Software Development by jfunchio …namespace std; class Observer; //=========================================================================== class Observable { public: virtual void attach(Observer…: CountingObserver(UpperCaseMonitor *); ~CountingObserver(); virtual void update(Observable*); void show_data(); //private: UpperCaseMonitor *_subject; int… Need help with the implementation of an observer pattern Programming Software Development by jfunchio …CountingObserver() { _subject->detach(this); } void CountingObserver::update(Observable* ChangedState) { if(ChangedState = _subject) show_data(); } void…::~AccumulatingObserver() { _subject->detach(this); } void AccumulatingObserver::update(Observable* ChangedState) { if(ChangedState = _subject) show_data(); } void… Problems accessing the maintained state changes in Oberver Pattern Programming Software Development by jfunchio …using namespace std; class Observer; //=========================================================================== class Observable { public: virtual void attach(Observer*) = …() { _subject->detach(this); } void AccumulatingObserver::update(Observable* ChangedState) { if(ChangedState = _subject) show_data(); } void… Re: Understanding observers, a simple program Programming Software Development by JamesCherrill … only annoying thing in the Java API version is that Observable is a class so if you want to use it… in practice you end up copy/pasting the code for observable into all your classes that need it. Maybe in Java… methods? (note to self: have a look at that). ps: Observable and Observer have been deprecated in Java 9, so their… Memory leak in Observer pattern Programming Software Development by Violet_82 …()){ setChanged();//set the flag to indicate that this observable has changed notifyObservers();//notify everyone //} } public String…String getName() { return name; } @Override public void update(Observable o, Object arg) { System.out.println("Username &… Re: Understanding observers, a simple program Programming Software Development by JamesCherrill … hold the list of listeners for each Observable I created a static Map with the Observable instance as key as its listeners… Re: Understanding observers, a simple program Programming Software Development by Violet_82 … only annoying thing in the Java API version is that Observable is a class so if you want to use it…