A car rental company's rental cars and rental vehicles as follows: 1. The car Audi Q7 600 yuan / day BMW X7 700 yuan / day Mercedes-Benz G 800 large / day 2 buses less than or equal 16, 800 yuan / day greater than 16, 1200 / day a step objects designed for 1, the analysis needs to find a noun (class attributes) brand, model (sedan), license plate number, date of rent (constant, you can write to die in the program), number of seats (buses) find verb (method) calculation of rent 2, class design parent: brand, license plate number subclass car: model bus: The number of seats car rental management class entrance and system interface 3, optimization car (the parent class, abstract class): calculate rent -> abstract method II summarizes the object-oriented: encapsulation, inheritance, polymorphism
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