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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)
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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Java – Array of ArraysYou can define an array of arrays in Java. Outer array contains arrays elements. Inner arrays is just like a normal array of integers, or array of strings, etc.
We declare an array in Java as we do other variables, by providing a type and name: int[] myArray; To initialize or instantiate an array as we declare it, meaning we assign values as when we create the array, we can use the following shorthand syntax: int[] myArray = {13, 14, 15};
A jagged array is an array whose elements are arrays, possibly of different sizes. A jagged array is sometimes called an "array of arrays." The following examples show how to declare, initialize, and access jagged arrays.
There are two types of arrays in Java they are − Single dimensional array − A single dimensional array of Java is a normal array where, the array contains sequential elements (of same type) − int[] myArray = {10, 20, 30, 40}
You could do essentially the same code with Hashtables (or some other Map):
Hashtable<String, Hashtable<String, String>> schedule
= new Hashtable<String, Hashtable<String, String>>();
schedule.put("A", new Hashtable<String, String>());
schedule.put("B", new Hashtable<String, String>());
schedule.put("C", new Hashtable<String, String>());
schedule.put("D", new Hashtable<String, String>());
schedule.put("E", new Hashtable<String, String>());
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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