1. private double amountFor(Rental aRental)
return aRental.getCharge(); }
initially replace the body with the call
remove this method later on and call directly
while (rentals.hasMoreElements()) {
double thisAmount = 0;
Rental each = (Rental) rentals.nextElement();
thisAmount = each.getCharge();
… the rest continues as before

2. frequent renter points
Let’s do the same thing with the logic to calculate frequent renter points
extract method
each can be parameter
frequentRenterPoints has a value before the method is invoked, but the new method does not read it; we simply need to use appending assignment outside the method.
move method
Again, we are only using information from Rental, not Customer, so let’s move getFrequentRenterPoints to the Rental class.
Be sure to run your test cases after each step

3. // add frequent renter points
// add bonus for two day new release rental
if ((each.getMovie().getPriceCode() == Movie.NEW_RELEASE) &&
each.getDaysRented() > 1)
// show figures for this rental
result += “\t” + each.getMovie().getTitle() + “\t” +
String.valueOf(thisAmount) + “\n”;
totalAmount += thisAmount;
} // end while