/**     * Returns a hash code value for the object. This method is     * supported for the benefit of hash tables such as those provided by     * {
    @link java.util.HashMap}.     * 
     * The general contract of {
    @code hashCode} is:     * 
     
           * 
      
Whenever it is invoked on the same object more than once during     *     an execution of a Java application, the {
    @code hashCode} method     *     must consistently return the same integer, provided no information     *     used in {
    @code equals} comparisons on the object is modified.     *     This integer need not remain consistent from one execution of an     *     application to another execution of the same application.     * 
      
If two objects are equal according to the {
    @code equals(Object)}     *     method, then calling the {
    @code hashCode} method on each of     *     the two objects must produce the same integer result.     * 
      
It is not required that if two objects are unequal     *     according to the {
    @link java.lang.Object#equals(java.lang.Object)}     *     method, then calling the {
    @code hashCode} method on each of the     *     two objects must produce distinct integer results.  However, the     *     programmer should be aware that producing distinct integer results     *     for unequal objects may improve the performance of hash tables.     * 
     
     * 
     * As much as is reasonably practical, the hashCode method defined by     * class {
    @code Object} does return distinct integers for distinct     * objects. (This is typically implemented by converting the internal     * address of the object into an integer, but this implementation     * technique is not required by the     * JavaTM programming language.)     *     * @return  a hash code value for this object.     * @see     java.lang.Object#equals(java.lang.Object)     * @see     java.lang.System#identityHashCode     */    public native int hashCode();