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

        Object src = new Object();
        PropertyChangeSupport sup = new PropertyChangeSupport(src);
        PropertyChangeListener l1 = new MockPropertyChangeListener();


        sup.addPropertyChangeListener(l1);
        sup.addPropertyChangeListener(l1);


        PropertyChangeListener[] listeners = sup.getPropertyChangeListeners();
        assertEquals(2, listeners.length);
        assertSame(l1, listeners[0]);
        assertSame(l1, listeners[1]);

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        PropertyChangeListener l2 = new MockPropertyChangeListener();
        PropertyChangeListener l3 = new PropertyChangeListenerProxy("myProp",
                l2);
        PropertyChangeListener[] listeners;


        sup.addPropertyChangeListener("myProp2", l1);


        listeners = sup.getPropertyChangeListeners();
        assertEquals(1, listeners.length);
        assertSame(l1, ((PropertyChangeListenerProxy) listeners[0])
                .getListener());

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        assertEquals(1, listeners.length);
        assertSame(l1, ((PropertyChangeListenerProxy) listeners[0])
                .getListener());


        sup.removePropertyChangeListener(listeners[0]);
        sup.addPropertyChangeListener("myProp3", l3);
        listeners = sup.getPropertyChangeListeners();
        assertEquals(1, listeners.length);
        // pay attention to this recursive proxy
        assertNotSame(l3, ((PropertyChangeListenerProxy) listeners[0])
                .getListener());

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     */
    public void testAddPropertyChangeListener_PropertyChangeListener_String_NullListener() {
        Object src = new Object();
        PropertyChangeSupport sup = new PropertyChangeSupport(src);


        sup.addPropertyChangeListener("myProp", null);


        PropertyChangeListener[] listeners = sup.getPropertyChangeListeners();
        assertEquals(0, listeners.length);


        new PropertyChangeListenerProxy("myProp", null);

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        PropertyChangeListener l1 = new MockPropertyChangeListener();
        PropertyChangeListener l2 = new MockPropertyChangeListener();
        PropertyChangeListener l3 = new PropertyChangeListenerProxy("myProp",
                l2);


        sup.addPropertyChangeListener(null, l1);
        sup.addPropertyChangeListener(null, l3);
        l3 = new PropertyChangeListenerProxy(null, l2);
        sup.addPropertyChangeListener(l3);
    }

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        PropertyChangeListener l2 = new MockPropertyChangeListener();
        PropertyChangeListener l3 = new PropertyChangeListenerProxy("myProp",
                l2);


        sup.addPropertyChangeListener(null, l1);
        sup.addPropertyChangeListener(null, l3);
        l3 = new PropertyChangeListenerProxy(null, l2);
        sup.addPropertyChangeListener(l3);
    }


    /*

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                l2);


        sup.addPropertyChangeListener(null, l1);
        sup.addPropertyChangeListener(null, l3);
        l3 = new PropertyChangeListenerProxy(null, l2);
        sup.addPropertyChangeListener(l3);
    }


    /*
     * Test the method addPropertyChangeListener(PropertyChangeListener,
     * String) with a listener parameter that has already been registered for

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        PropertyChangeListener l1 = new MockPropertyChangeListener();
        PropertyChangeListener l2 = new MockPropertyChangeListener();
        PropertyChangeListener l3 = new PropertyChangeListenerProxy("myProp",
                l2);


        sup.addPropertyChangeListener("myProp2", l1);
        sup.addPropertyChangeListener("myProp2", l1);


        PropertyChangeListener[] listeners = sup.getPropertyChangeListeners();
        assertEquals(2, listeners.length);
        assertSame(l1, ((PropertyChangeListenerProxy) listeners[0])

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        PropertyChangeListener l2 = new MockPropertyChangeListener();
        PropertyChangeListener l3 = new PropertyChangeListenerProxy("myProp",
                l2);


        sup.addPropertyChangeListener("myProp2", l1);
        sup.addPropertyChangeListener("myProp2", l1);


        PropertyChangeListener[] listeners = sup.getPropertyChangeListeners();
        assertEquals(2, listeners.length);
        assertSame(l1, ((PropertyChangeListenerProxy) listeners[0])
                .getListener());

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        assertSame(l1, ((PropertyChangeListenerProxy) listeners[1])
                .getListener());


        sup.removePropertyChangeListener(listeners[0]);
        sup.removePropertyChangeListener(listeners[1]);
        sup.addPropertyChangeListener("myProp3", l3);
        sup.addPropertyChangeListener("myProp3", l3);
        listeners = sup.getPropertyChangeListeners();
        assertEquals(2, listeners.length);
        assertSame(
                l2,

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