Project 16: Questions about profit() method

[Jesse Howell]

First off, is the name important? If I make a getProfit() method,
will I get points taken away?

Second, I'm assuming that the difference between an abstract class
which fulfills the interface requirement from a normal class is the
abstract modifier on the profit() method. If this is giving away too
much info about the assignment, let me know.

Third, is there a way to use

public double profit()
{
NumberFormat dollarFormat = NumberFormat.getCurrencyInstance();
return dollarFormat.format(profit calculation);
}

Within a class and have the formatted double returned and printed
within the driver? Or would one have to

return (profit calculation);

in the profit method and then

NumberFormat dollarFormat = NumberFormat.getCurrencyInstance();
System.out.print("Profit is " +
dollarFormat.format(investment1.profit());

?

[Sarah Morley]

The name isn't important. As long as it's clear what its purpose is, it's fine.

Yes, you'd have an abstract modifier on the method as well as a modifier on the class:

public abstract class SomeClass{

}

The format method in the NumberFormat class returns a String, so if you wanted to return a formatted String, profit would need a String return type. I would suggest your second option of returning a double and formatting it in the driver.

Sarah

[Jesse Howell]

Thank you. There also seems to be a typo for project 16...

--Stock has members called currentValue and purchasePrice. Profit =
purchasePrice - currentValue (1 pt)

Wouldn't the profit be currentValue - purchasePrice?

[Jesse Howell]

And... wow. Apparently as soon as you buy a rental, the cost
automatically becomes your profit.

Profit = purchasePrice - monthlyRent * monthsRented - repairCost. (1
pt)

I'm guessing a "currentValue - " needs to be inserted before
purchasePrice... and then you would ADD (monthlyRent * monthsRented),
not subtract it.

Or you could just add the repair cost instead of subtract, pretend
that you'll never sell it, and then negate the whole thing!

[Lorin Henricks]

Rob has already said that the Stock was wrong, and I made the same changes for Rental as well.

What i did for the print statement was i didn't like the 

print(rental.profit())

- so i did

rentalprofit = rental.profit();

print(rentalprofit);

That looked better to me, but i didn't really change anything