The only change required is limited to the body of method allGifts(int day):
static String allGifts(int day)
{
StringBuilder result = new StringBuilder();
for( int i = day; i > 0; i-- )
{
result.append(GIFTS[i] + "\n");
}
result.append("and " + GIFTS[0]);
return result.toString();
}Here is the complete code. Because the change can be isolated to within a method, the impact on the design is minimal. Perhaps it makes the code easier to understand for readers unfamiliar with recursion.
This is one possible solution. The highlight of this solution is that instead of retrieving the string that describes the day directly from a data structure, a method day(int) now abstracts this concept, and hides the details of where the string comes from and the switching logic. Abstraction and information hiding are topics covered in Chapter 2.
The proposed solution uses a global variable (asDigits ). In larger programs, use of global variables leads to poor code comprehensibility and encapsulation (see Chapter 2). For this reason, global variables are best avoided. In the case of the TwelveDays program, the alternative would be to pass the Boolean "asDigit" indicator as an argument to the poem method. However, this would also require passing it as argument to firstLine and then to day (try it!). For this small program, which is the cleanest solution can be quite subjective.
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