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

 

public class MotorBoat {

 

// The capacity of the fuel tank

private double capacity;

 

// The amount of fuel in the tank

private double amount;

 

// The maximum speed of the boat

private double maxSpeed;

 

// The current speed of the boat

private double currSpeed;

 

// The efficiency of the boat's motor

private double efficiency;

 

// The distance traveled

private double distanceTraveled;

 

// Change the speed of the boat

private void changeSpeed(double newSpeed) {

this.currSpeed = newSpeed;

}

 

// Operate the boat for an

// amount of time at the current speed

// I can't get it

 

// Refuel the boat with some amount of fuel

private void refuel(double newAmount) {

this.amount += newAmount;

}

 

// Return the amount of fuel in the tank

private double getFuelAmount() {

return this.amount;

}

 

// Return the distance traveled so far

private double getDistanceTraveled() {

return this.distanceTraveled;

}

 

//

// If the boat has efficiency e, the amount of fuel used when traveling at a

// speed s for time t is e x s^2(s squared) x t. The distance traveled in

// that time is s x t.

private void computeAmount() {

 

this.amount = this.efficiency * (this.currSpeed * this.currSpeed)

* (this.distanceTraveled / this.currSpeed);

 

}

 

// a. Write a method heading for each method.

// b. Write preconditions and postconditions for each method.

// c. Write some Java statements that test the class.

// d. Implement the class.

 

public static void main(String[] args) {

 

MotorBoat boat = new MotorBoat();

 

System.out.println("Current Speed: " + boat.currSpeed);

 

boat.changeSpeed(200);

System.out.println("Current Speed: " + boat.currSpeed);

 

System.out.println("Fuel Amount: " + boat.getFuelAmount());

boat.refuel(2000);

System.out.println("Fuel Amount: " + boat.getFuelAmount());

 

System.out.println("Distance Traveled: " + boat.getDistanceTraveled());

 

boat.computeAmount();

System.out.println("Fuel Amount: " + boat.getFuelAmount());

 

}

 

}