strategy enum pattern

enum PayrollDay {

MONDAY(PayType.WEEKDAY), TUESDAY(PayType.WEEKDAY), WEDNESDAY(

PayType.WEEKDAY), THURSDAY(PayType.WEEKDAY), FRIDAY(PayType.WEEKDAY), SATURDAY(

PayType.WEEKEND), SUNDAY(PayType.WEEKEND);

 

private final PayType payType;

 

PayrollDay(PayType payType) {

this.payType = payType;

}

 

double pay(double hoursWorked, double payRate) {

return payType.pay(hoursWorked, payRate);

}

 

// The strategy enum type

private enum PayType {

WEEKDAY {

double overtimePay(double hours, double payRate) {

return hours <= HOURS_PER_SHIFT ? 0 : (hours - HOURS_PER_SHIFT)

* payRate / 2;

}

},

WEEKEND {

double overtimePay(double hours, double payRate) {

return hours * payRate / 2;

}

};

private static final int HOURS_PER_SHIFT = 8;

 

abstract double overtimePay(double hrs, double payRate);

 

double pay(double hoursWorked, double payRate) {

double basePay = hoursWorked * payRate;

return basePay + overtimePay(hoursWorked, payRate);

}

}

}