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Write a class definition for an abstract class , Vehicle, that contains: a double instance variable , maxSpeed a protected double instance variable , currentSpeed a constructor accepting a double used to initialize the maxSpeed instance variable an abstract method , accelerate, that accepts no parameters and returns nothing. a method getCurrentSpeed that returns the value of currentSpeed a method getMaxSpeed that returns the value of maxSpeed a method , pedalToTheMetal, that repeatedly calls accelerate until the speed of the vehicle is equal to maxSpeed. pedalToTheMetal returns nothing.