Problem
In this problem, you will model a circuit consisting of an arbitrary configuration of resistors. Provide a superclass Circuit with a instance method get Resistance. Provide a subclass Resistor representing a single resistor. Provide subclasses Serial and Parallel, each of which contains an ArrayList. A Serial circuit models a series of circuits, each of which can be a single resistor or another circuit. Similarly, a Parallel circuit models a set of circuits in parallel. For example, the following circuit is a Parallel circuit containing a single resistor and one Serial circuit:
Use Ohm's law to compute the combined resistance.