Edit C:\Program Files\Java\jdk1.8.0_121\javafx\collections\ObservableArrayBase.java

/*
 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javafx.collections;

import com.sun.javafx.collections.ArrayListenerHelper;
import javafx.beans.InvalidationListener;

/**
 * Abstract class that serves as a base class for {@link ObservableArray} implementations.
 * The base class provides listener handling functionality by implementing
 * {@code addListener} and {@code removeListener} methods.
 * {@link #fireChange(boolean, int, int) } method is provided
 *      for notifying the listeners.
 * @param <T> actual array instance type
 * @see ObservableArray
 * @see ArrayChangeListener
 * @since JavaFX 8.0
 */
public abstract class ObservableArrayBase<T extends ObservableArray<T>> implements ObservableArray<T> {

private ArrayListenerHelper<T> listenerHelper;

@Override public final void addListener(InvalidationListener listener) {
        listenerHelper = ArrayListenerHelper.<T>addListener(listenerHelper, (T) this, listener);
    }

@Override public final void removeListener(InvalidationListener listener) {
        listenerHelper = ArrayListenerHelper.removeListener(listenerHelper, listener);
    }

@Override public final void addListener(ArrayChangeListener<T> listener) {
        listenerHelper = ArrayListenerHelper.<T>addListener(listenerHelper, (T) this, listener);
    }

@Override public final void removeListener(ArrayChangeListener<T> listener) {
        listenerHelper = ArrayListenerHelper.removeListener(listenerHelper, listener);
    }

/**
     * Notifies all listeners of a change
     * @param change
     */
    protected final void fireChange(boolean sizeChanged, int from, int to) {
        ArrayListenerHelper.fireValueChangedEvent(listenerHelper, sizeChanged, from, to);
    }
}

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