Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\binding\DoubleConstant.java

/*
 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 */

package com.sun.javafx.binding;

import javafx.beans.InvalidationListener;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableDoubleValue;

/**
 * A simple DoubleExpression that represents a single constant value.
 */
public final class DoubleConstant implements ObservableDoubleValue {

private final double value;

private DoubleConstant(double value) {
        this.value = value;
    }

public static DoubleConstant valueOf(double value) {
        return new DoubleConstant(value);
    }

@Override
    public double get() {
        return value;
    }

@Override
    public Double getValue() {
        return value;
    }

@Override
    public void addListener(InvalidationListener observer) {
        // no-op
    }

@Override
    public void addListener(ChangeListener<? super Number> listener) {
        // no-op
    }

@Override
    public void removeListener(InvalidationListener observer) {
        // no-op
    }

@Override
    public void removeListener(ChangeListener<? super Number> listener) {
        // no-op
    }

@Override
    public int intValue() {
        return (int) value;
    }

@Override
    public long longValue() {
        return (long) value;
    }

@Override
    public float floatValue() {
        return (float) value;
    }

@Override
    public double doubleValue() {
        return value;
    }
}

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