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want to make a table~~~

 
Alex cordes
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do u know how to make a table for a data? whats its code?



these r my arraylists~~~and how can i make a table for them???
thanks a lot~~~
 
Jody Brown
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What sort of a table? A html table to display them? If that is the case you might want to consider using a JSP. If you want to use a Hashtable, then just define one...need more information to help you I think.
 
Alex cordes
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Originally posted by Jody Brown:
What sort of a table? A html table to display them? If that is the case you might want to consider using a JSP. If you want to use a Hashtable, then just define one...need more information to help you I think.


thanks for ur reply
just a Hashtable,i m tring to write a Problem Class Register program. and i want to write a table to display who is present in the class in which day... ...
 
Jody Brown
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A Hashtable is just defined as:



Elements are added to it using:



Elements are obtained using:



Hashtables are in the java.util package, and store a table of data in key-value pairs.

Hope this helps.
 
Jody Brown
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A slight correction to one of my code snippets...

This:



Should read:



the get() method returns an object, thus the cast is needed. Any object can be stored as the key or value, the String was just an example.
 
Alex cordes
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thank you for ur reply~~~
i dont quite get ("aKey", "aValue")... ...
i have two vailables: NAMEs and DATEs
so how can i put these two vailables into this hashtable?
 
Rick Beaver
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A hashtable maps a key and a value - so you can choose one of your data items (lets say for example name) as the key and put that into the hastable with it's associated date - this provides a link between your name and date values.

The point of this is to retrieve a value from it's associated key.

(p.s. Tildas are a bit annoying )
 
Jeff Albertson
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http://java.sun.com/docs/books/tutorial/collections/index.html
 
Stan James
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What question will you ask of this table ...

Who was in class on 11/17?

or

On what days did Bob attend?

I think either way you'll want more than just a Hashmap. In the first example, the date would be the key and you want the map to give you a bunch of people who were there that day. In the second example, the name would be the key and you'd want a bunch of dates that person was present.

Does that make sense so far? While you're looking at the collections tutorial, see if you spot a few choices to hold a "bunch" of names or dates.
 
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