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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def new_instance(cls, classname, length):
 """ Creates a new array with the given classname and length; initial values are null. :param classname: the classname in Java notation (eg "weka.core.DenseInstance") :type classname: str :param length: the length of the array :type length: int :return: the Java array :rtype: JB_Object """

        return javabridge.static_call(
            "Ljava/lang/reflect/Array;",
            "newInstance",
            "(Ljava/lang/Class;I)Ljava/lang/Object;",
            get_jclass(classname=classname), length)