Chapter 5, Problem 7E

Consider a class MotorBoat that represents motorboats. A motorboat has attributes for

• The capacity of the fuel tank
• The amount of fuel in the tank
• The maximum speed of the boat
• The current speed of the boat
• The efficiency of the boat’s motor
• The distance traveled

The class has methods to

• Change the speed of the boat
• Operate the boat for an amount of time at the current speed
• Refuel the boat with some amount of fuel
• Return the amount of fuel in the tank
• Return the distance traveled so far

If the boat has efficiency e, the amount of fuel used when traveling at a speed s for time t is e × s² × t. The distance traveled in that time is s × t.

1. a. Write a method heading for each method.
2. b. Write preconditions and postconditions for each method.
3. c. Write some Java statements that test the class.
4. d. Implement the class.