Examples of java.beans.PropertyChangeSupport.addPropertyChangeListener()

java.beans.PropertyChangeSupport.addPropertyChangeListener()
Add a PropertyChangeListener to the listener list. The listener is registered for all properties. The same listener object may be added more than once, and will be called as many times as it is added. If listener is null, no exception is thrown and no action is taken. @param listener The PropertyChangeListener to be added

        PropertyChangeListener lis2 = new PropertyChangeListenerProxy("name",
                lis1);


        assertEquals(0, prop.getPropertyChangeListeners().length);


        prop.addPropertyChangeListener(lis2);
        assertEquals(1, prop.getPropertyChangeListeners().length);


        prop.removePropertyChangeListener("name", lis1);
        assertEquals(0, prop.getPropertyChangeListeners().length);
    }

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            }
        };


        PropertyChangeSupport pcs = new PropertyChangeSupport(this);


        pcs.addPropertyChangeListener("property", listener);
        PropertyChangeListener[] listeners = pcs.getPropertyChangeListeners();
        assertEquals(1, listeners.length);


        pcs.removePropertyChangeListener(listeners[0]);
        listeners = pcs.getPropertyChangeListeners();

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        try {
            oos = new ObjectOutputStream(new FileOutputStream("x.ser"));
            PropertyChangeSupport pcs = new PropertyChangeSupport("bean");
            if (array != null && array.length > 0) {
                for (PropertyChangeListener element : array) {
                    pcs.addPropertyChangeListener(element);
                }
            }
            oos.writeObject(pcs);
            oos.flush();
        } catch (Exception e) {

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        PropertyChangeListener[] listeners = sup.getPropertyChangeListeners();
        assertEquals(1, listeners.length);
        sup.removePropertyChangeListener(l1);
        listeners = sup.getPropertyChangeListeners();
        assertEquals(0, listeners.length);
        sup.addPropertyChangeListener(l3);
        listeners = sup.getPropertyChangeListeners();
        assertEquals(1, listeners.length);
        sup.removePropertyChangeListener(l3);
        listeners = sup.getPropertyChangeListeners();
        assertEquals(0, listeners.length);

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        listeners = sup.getPropertyChangeListeners();
        assertEquals(1, listeners.length);
        sup.removePropertyChangeListener(l3);
        listeners = sup.getPropertyChangeListeners();
        assertEquals(0, listeners.length);
        sup.addPropertyChangeListener("myProp3", l2);
        listeners = sup.getPropertyChangeListeners();
        assertEquals(1, listeners.length);
        sup.removePropertyChangeListener(l2);
        listeners = sup.getPropertyChangeListeners();
        assertEquals(1, listeners.length);

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        Object src = new Object();
        PropertyChangeSupport sup = new PropertyChangeSupport(src);


        sup.removePropertyChangeListener(null);
        assertEquals(0, sup.getPropertyChangeListeners().length);
        sup.addPropertyChangeListener(null);
        assertEquals(0, sup.getPropertyChangeListeners().length);
        sup.removePropertyChangeListener(null);
        assertEquals(0, sup.getPropertyChangeListeners().length);
    }

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        Object oldValue = new Object();


        MockPropertyChangeListener l1 = new MockPropertyChangeListener(src,
                "myProp", oldValue, newValue);


        sup.addPropertyChangeListener(l1);


        sup.removePropertyChangeListener("myProp", l1);
        assertEquals(1, sup.getPropertyChangeListeners().length);
        assertEquals(0, sup.getPropertyChangeListeners("myProp").length);
        sup.firePropertyChange("myProp", oldValue, newValue);

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     */
    public void testRemovePropertyChangeListener_PropertyChangeListener_String_PropertyRegistered() {
        Object src = new Object();
        PropertyChangeSupport sup = new PropertyChangeSupport(src);
        PropertyChangeListener l1 = new MockPropertyChangeListener();
        sup.addPropertyChangeListener("myProp", l1);
        assertEquals(1, sup.getPropertyChangeListeners().length);


        sup.removePropertyChangeListener("myProp", l1);
        assertEquals(0, sup.getPropertyChangeListeners().length);
        assertEquals(0, sup.getPropertyChangeListeners("myProp").length);

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        assertEquals(0, sup.getPropertyChangeListeners("myProp").length);


        PropertyChangeListener l2 = new MockPropertyChangeListener();
        PropertyChangeListener l3 = new PropertyChangeListenerProxy("myProp",
                l2);
        sup.addPropertyChangeListener(l3);
        assertEquals(1, sup.getPropertyChangeListeners().length);
        sup.removePropertyChangeListener("myProp", l2);
        assertEquals(0, sup.getPropertyChangeListeners().length);
        assertEquals(0, sup.getPropertyChangeListeners("myProp").length);
    }

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        Object src = new Object();
        PropertyChangeSupport sup = new PropertyChangeSupport(src);


        sup.removePropertyChangeListener("myProp", null);
        assertEquals(0, sup.getPropertyChangeListeners().length);
        sup.addPropertyChangeListener("myProp", null);
        assertEquals(0, sup.getPropertyChangeListeners().length);
        sup.removePropertyChangeListener("myProp", null);
        assertEquals(0, sup.getPropertyChangeListeners().length);
    }

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