Build an array of object?

Hey people BBerry...

I hope that these issues become less basic, but...

This is baffling me... I go through the "MemoryDemo" sent with the samples.  In the method below, if the getContents() returns a null value, it is filled with the "empty folder" (to use a term of database).  What I'm having problems understanding (and if someone could point me to the documentation on that, I would appreciate it) is how we can do it at all (at least based on playback on Java, I did until now).

It seems one can declare which * seems * to be a table based on the structure of an object (this object is not on the same file .java) then add ot this table by a simple declaration of 'new '.  Is this correct?  Everything I've read so far on tables says that this should not be so.

What I'm missing here?  Thanks in advance, (truncated) chiselled code is below (the rest is in the inventory of "MemoryDemo" app in the CustomerList.java file).

-John

// Members -------------------------------------------------------------------------------------
private PersistentObject _persist;
private CustomerRecord [] _customerRecords;

CustomerList() private
{
_persist = PersistentStore.getPersistentObject (PERSIST);
_customerRecords = (CustomerRecord []) _persist.getContents ();

If (_customerRecords is nothing)
{
_customerRecords = new CustomerRecord [0];
_persist.setContents (_customerRecords);
_persist.commit ();
}
}

You said

"Foobar foo [] = Foobar new [5];

It will give me a table which has 5 "ranks" and 3 "columns" (speaking in terms of a database)? »

Not really.  All you have done is created of references to objects of Foobar 5.  You have not created the objects.  So, if you tried to do:

String firstEntryLastName = foo [0] .getLastName ();

This fails with a null pointer exception, because foo [0] does not exist.

If you did then a loop initialization as I did above, you would have 5 ranks "empty."

"it will work even if the class is elsewhere"

Absolutely, although of course the class that should be able to find the p [package containing Foobar.

Tags: BlackBerry Developers

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