Edit C:\Program Files\Java\jdk1.8.0_121\javafx\beans\property\ReadOnlyDoubleProperty.java

/*
 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package javafx.beans.property;

import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.WeakInvalidationListener;
import javafx.beans.binding.DoubleExpression;

/**
 * Super class for all readonly properties wrapping a {@code double}.
 *
 * @see javafx.beans.value.ObservableDoubleValue
 * @see javafx.beans.binding.DoubleExpression
 * @see ReadOnlyProperty
 *
 * @since JavaFX 2.0
 */
public abstract class ReadOnlyDoubleProperty extends DoubleExpression implements
        ReadOnlyProperty<Number> {

/**
     * The constructor of {@code ReadOnlyDoubleProperty}.
     */
    public ReadOnlyDoubleProperty() {
    }

/**
     * Returns a string representation of this {@code ReadOnlyDoubleProperty} object.
     * @return a string representation of this {@code ReadOnlyDoubleProperty} object.
     */
    @Override
    public String toString() {
        final Object bean = getBean();
        final String name = getName();
        final StringBuilder result = new StringBuilder(
                "ReadOnlyDoubleProperty [");
        if (bean != null) {
            result.append("bean: ").append(bean).append(", ");
        }
        if ((name != null) && !name.equals("")) {
            result.append("name: ").append(name).append(", ");
        }
        result.append("value: ").append(get()).append("]");
        return result.toString();
    }

/**
     * Returns a {@code ReadOnlyDoubleProperty} that wraps a
     * {@link javafx.beans.property.ReadOnlyProperty}. If the
     * {@code ReadOnlyProperty} is already a {@code ReadOnlyDoubleProperty}, it
     * will be returned. Otherwise a new
     * {@code ReadOnlyDoubleProperty} is created that is bound to
     * the {@code ReadOnlyProperty}.
     *
     * Note: null values will be interpreted as 0.0
     *
     * @param property
     *            The source {@code ReadOnlyProperty}
     * @return A {@code ReadOnlyDoubleProperty} that wraps the
     *         {@code ReadOnlyProperty} if necessary
     * @throws NullPointerException
     *             if {@code property} is {@code null}
     * @since JavaFX 8.0
     */
    public static <T extends Number> ReadOnlyDoubleProperty readOnlyDoubleProperty(final ReadOnlyProperty<T> property) {
        if (property == null) {
            throw new NullPointerException("Property cannot be null");
        }

return property instanceof ReadOnlyDoubleProperty ? (ReadOnlyDoubleProperty) property:
           new ReadOnlyDoublePropertyBase() {
            private boolean valid = true;
            private final InvalidationListener listener = observable -> {
                if (valid) {
                    valid = false;
                    fireValueChangedEvent();
                }
            };

{
                property.addListener(new WeakInvalidationListener(listener));
            }

@Override
            public double get() {
                valid = true;
                final T value = property.getValue();
                return value == null ? 0.0 : value.doubleValue();
            }

@Override
            public Object getBean() {
                return null; // Virtual property, no bean
            }

@Override
            public String getName() {
                return property.getName();
            }
        };
    }

/**
     * Creates a {@link javafx.beans.property.ReadOnlyObjectProperty} that holds the value
     * of this {@code ReadOnlyDoubleProperty}. If the
     * value of this {@code ReadOnlyDoubleProperty} changes, the value of the
     * {@code ReadOnlyObjectProperty} will be updated automatically.
     *
     * @return the new {@code ReadOnlyObjectProperty}
     * @since JavaFX 8.0
     */
    @Override
    public ReadOnlyObjectProperty<Double> asObject() {
        return new ReadOnlyObjectPropertyBase<Double>() {

private boolean valid = true;
            private final InvalidationListener listener = observable -> {
                if (valid) {
                    valid = false;
                    fireValueChangedEvent();
                }
            };

{
                ReadOnlyDoubleProperty.this.addListener(new WeakInvalidationListener(listener));
            }

@Override
            public Object getBean() {
                return null; // Virtual property, does not exist on a bean
            }

@Override
            public String getName() {
                return ReadOnlyDoubleProperty.this.getName();
            }

@Override
            public Double get() {
                valid = true;
                return ReadOnlyDoubleProperty.this.getValue();
            }
        };
    };

}

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