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 for If the boat has efficiency e, the amount of fuel used when traveling at a speed s for time t is e x s2xt. The distance traveled in that time is sxt. Write a method heading for each method. Write preconditions and postconditions for each method. Write some Java statements that test the class. Implement the class