一个AutoShop Project，具体见英文描述，是我的一个小作业，呵呵。-• 　　Create a super class called Car.　The Car class has the following fields and methods.

o　　int speed　

o　　double regularPrice

o　　String color　

o　　double getSalePrice()　

• 　　Create a subclass of Car class and name it as Truck.　The Truck class has the following fields and methods.

o　　int weight　

o　　double getSalePrice()　 // If weight > 2000, 10　discount. Otherwise, 20　discount.

• 　　Create a subclass of Car class and name it as Ford.　The Ford class has the following fields and methods

o　　int year　

o　　int manufacturerDiscount

o　　double getSalePrice()　 // From the sale price computed from Car class, subtract the manufacturerDiscount.

• 　　Create a subclass of Car class and name it as Sedan. The Sedan class has the following fields and methods.

o　　int length　

o　　double getSalePrice()　 // If length > 20 feet, 5　discount, Otherwise, 10　discount.

• 　　Create MyOwnAutoShop class which contains the main() method.　Perform the following within the