Edit C:\Program Files\Java\jdk1.8.0_121\javafx\scene\layout\Priority.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.scene.layout;

/**
 * Enumeration used to determine the grow (or shrink) priority of a given node's
 * layout area when its region has more (or less) space available and
 * multiple nodes are competing for that space.
 *
 * @since JavaFX 2.0
 */
public enum Priority {
    /**
     * Layout area will always try to grow (or shrink), sharing the increase
     * (or decrease) in space with other layout areas that have a grow
     * (or shrink) of ALWAYS.
     */
    ALWAYS,

/**
     * If there are no other layout areas with grow (or shrink) set to ALWAYS
     * or those layout areas didn't absorb all of the increased (or decreased) space,
     * then will share the increase (or decrease) in space with other
     * layout area's of SOMETIMES.
     */
    SOMETIMES,

/**
     * Layout area will never grow (or shrink) when there is an increase (or
     * decrease) in space available in the region.
     */
    NEVER;

/**
     * Convenience method for returning the higher of two priorities.
     * @param a first priority
     * @param b second priority
     * @return the highest of the two priorities
     */
    public static Priority max(Priority a, Priority b) {
        if (a == ALWAYS || b == ALWAYS) {
            return ALWAYS;
        } else if (a == SOMETIMES || b == SOMETIMES) {
            return SOMETIMES;
        } else {
            return NEVER;
        }
    }

/**
     * Convenience method for returning the lower of two priorities.
     * @param a first priority
     * @param b second priority
     * @return the lower of the two priorities
     */
    public static Priority min(Priority a, Priority b) {
        if (a == NEVER || b == NEVER) {
            return NEVER;
        } else if (a == SOMETIMES || b == SOMETIMES) {
            return SOMETIMES;
        } else {
            return ALWAYS;
        }
    }
}

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