java

Code a subclass named ExpressCard that inherits from the superclass CreditCard, which has two private data members:

$1.$ foreignFeeRate of double type,

$2.$ and domesticBonusMileageRate of double type.

Provide:

$1.$ default constructor with no parameters,

$2.$ constructor with all parameters to initialize its own private data and the inherited data from CreditCard

$3.$ getter$/$setter methods for each data member

There are two effector methods:

$1.$ Method calcFee$()$ takes no parameters and it returns double type.

a$.$ This method calculates the transaction fee.

b$.$ First you need to call the method in superclass to obtain the basic fee, and then for ExpressCard user, there is an extra charge for foreign spending.

c$.$ Given the same example above as in class CreditCard, the basic fee is $$3,$ and under a foreignFeeRate of $3\%,$ then the extra fee is calculated by multiplying $$50$ of foreign spending with $3\%(0\mathrm{.}03)$ of foreignFeeRate, which yields $$50*0\mathrm{.}03=$ $$1\mathrm{.}5,$ so the total fee is $$3+$ $$1\mathrm{.}5=$ $$4\mathrm{.}5.$

$2.$ Method calcMileage$()$ takes no parameters and it returns double type.

a$.$ This method calculates the mileage award.

b$.$ First you need to call the method in superclass to obtain the basic mileage, then there is a bonus mileage award for domestic spending under a rate of domesticBonusMileageRate.

c$.$ Given the same example as in class CreditCard, the basic mileage award is $7\mathrm{.}5$ miles, and if the domesticBonusMileageRate is $4\%(0\mathrm{.}04),$ then the bonus mileage is calculated by multiplying $$100$ of domestic spending with domesticBonusMileageRate $0\mathrm{.}04,$ which yields $4$ miles. Then the total mileage award is $7\mathrm{.}5+4=11\mathrm{.}5$ miles.