Removed getCurrentMonthExpenses() method.
Renamed and minor changed the getAnyMonthExpenses(int month, int year) method to getCurrentMonthExpenses().
Removed unused imports and added some minor changes to the code.
Changed "doShow" method to: 

public void doShow() {
        System.out.print("Week balance: " + wec.getCurrentWeekExpenses());
    }
Changes:

-added getCurrentMonthExpenses(), getAnyMonthExpenses(CalendarDate startDate, CalendarDate endDate) and getAmountMonthExpenses(ArrayList<Expense> MonthExpenditure) methods.
-removed previous, non-working versions of similiar methods.
-removed bogus commentary from the code.
-COMMENTED getMonthExpensesbyType(int month, int year) to make the code compilable.

Still due to be done: JUnit tests.

By miniclip22 and fnmabreu.