Examples of java.util.Observable.addObserver()

java.util.Observable.addObserver()
Adds an observer to the set of observers for this object, provided that it is not the same as some observer already in the set. The order in which notifications will be delivered to multiple observers is not specified. See the class comment. @param o an observer to be added. @throws NullPointerException if the parameter o is null.

    observable.addObserver(test);
    assertEquals("Duplicate observer", 1, observable.countObservers());


    Observable o = new Observable();
    try {
      o.addObserver(null);
      fail("Expected adding a null observer to throw a NPE.");
    } catch (NullPointerException ex) {
      // expected;
    } catch (Throwable ex) {
      fail("Did not expect adding a new observer to throw a "

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    harness.checkPoint("adding null Observer");
    boolean ok = false;
    try
      {
  o.addObserver(null);
      }
    catch (NullPointerException _)
      {
  ok = true;
      }

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    observable.addObserver(test);
    assertEquals("Duplicate observer", 1, observable.countObservers());


    Observable o = new Observable();
    try {
      o.addObserver(null);
      fail("Expected adding a null observer to throw a NPE.");
    } catch (NullPointerException ex) {
      // expected;
    }
  }

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                Observable.class,
                Mockito.withSettings().serializable()
        );


        // play with mock
        observable.addObserver(null);
        observable.countObservers();


        // serialize to file
        serializeMock(observable, "mockito_mock.ser");
    }

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    observable.addObserver(test);
    assertEquals("Duplicate observer", 1, observable.countObservers());


    Observable o = new Observable();
    try {
      o.addObserver(null);
      fail("Expected adding a null observer to throw a NPE.");
    } catch (NullPointerException ex) {
      // expected;
    }
  }

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        Observable observable = observables.get(observableKey);
        if (observable == null) {
            observable = new DirObservable(path, filter);
            observables.put(observableKey, observable);
        }
        observable.addObserver(observer);
    }
    
    private String getObservableKey(String path, FileFilter filter) {
        return (filter != null)?(path + "_" + filter.toString()):path;
    }

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        Observable observable = observables.get(file);
        if (observable == null) {
            observable = new FileObservable(file);
            observables.put(file, observable);
        }
        observable.addObserver(observer);
    }
    
    public String getFullFileName(String fileName) {
        if (fileName.startsWith("/") || fileName.startsWith("\\")) {
            fileName = fileName.substring(1);

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                setChanged();
                super.notifyObservers();
            }            
        };        
        RuleEditorDialog ruleEditorDialog = rule == null ? new RuleEditorDialog(GuiManager.getInstance().getMainWindow(), ruleObserver) : new RuleEditorDialog(GuiManager.getInstance().getMainWindow(), ruleObserver, rule);
        ruleObserver.addObserver(this);        
        ruleEditorDialog.setVisible(true);
    }


    /** This method is called from within the constructor to
     * initialize the form.

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