Arrays of Arrays in Java

Question :

Arrays of Arrays in Java,

Answer :

This is a nasty one for me… I’m a PHP guy working in Java on a JSP project. I know how to do what I’m attempting through too much code and a complete lack of finesse.

I’d prefer to do it right. Here is the situation:

I’m writing a small display to show customers what days they can water their lawns based on their watering group (ABCDE) and what time of year it is. Our seasons look like this:
Summer (5-1 to 8-31)
Spring (3-1 to 4-30)
Fall (9-1 to 10-31)
Winter (11-1 to 2-28)

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An example might be:

If I’m in group A, here would be my allowed times:
Winter: Mondays only
Spring: Tues, Thurs, Sat
Summer: Any Day
Fall: Tues, Thurs, Sat

If I was writing this in PHP I would use arrays like this:

//M=Monday,t=Tuesday,T=Thursday.... etc  $schedule["A"]["Winter"]='M';  $schedule["A"]["Spring"]='tTS';  $schedule["A"]["Summer"]='Any';  $schedule["A"]["Fall"]='tTS';  $schedule["B"]["Winter"]='t';  

I COULD make the days arrays (array(“Tuesday”,”Thursday”,”Saturday”)) etc, but it is not necessary for what I’m really trying to accomplish.

I will also need to setup arrays to determine what season I’m in:

$seasons["Summer"]["start"]=0501;  $seasons["Summer"]["end"]=0801;  

Can anyone suggest a really cool way to do this? I will have today’s date and the group letter. I will need to get out of my function a day (M) or a series of days (tTS), (Any).

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You could do essentially the same code with Hashtables (or some other Map):

Hashtable> schedule      = new Hashtable>();  schedule.put("A", new Hashtable());  schedule.put("B", new Hashtable());  schedule.put("C", new Hashtable());  schedule.put("D", new Hashtable());  schedule.put("E", new Hashtable());    schedule.get("A").put("Winter", "M");  schedule.get("A").put("Spring", "tTS");  // Etc...  

Not as elegant, but then again, Java isn’t a dynamic language, and it doesn’t have hashes on the language level.

Note: You might be able to do a better solution, this just popped in my head as I read your question.

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