Edit C:\Program Files\Java\jdk1.8.0_121\javafx\util\Callback.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 javafx.util;

/**
 * The Callback interface is designed to allow for a common, reusable interface
 * to exist for defining APIs that requires a call back in certain situations.
 * <p>
 * Callback is defined with two generic parameters: the first parameter
 * specifies the type of the object passed in to the <code>call</code> method,
 * with the second parameter specifying the return type of the method.
 *
 * @param <P> The type of the argument provided to the <code>call</code> method.
 * @param <R> The type of the return type of the <code>call</code> method.
 * @since JavaFX 2.0
 */
@FunctionalInterface
public interface Callback<P,R> {
    /**
     * The <code>call</code> method is called when required, and is given a
     * single argument of type P, with a requirement that an object of type R
     * is returned.
     *
     * @param param The single argument upon which the returned value should be
     *      determined.
     * @return An object of type R that may be determined based on the provided
     *      parameter value.
     */
    public R call(P param);
}

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