Vectors and vectors and storage

Hi, I'm new to the idea of a persistent storage. But I managed to just simply record a channel... that's all

I will try to implement vectors with persistent storage.

I want to however the following questions were answered.

  1. A vector can be stored on other things in addition to the elementary data types? For example a vector can store the Editfields or LabelFields with content?
  2. A vector stores objects; Does that mean that I can create a custom object and then make a vehicle more of one of my custom object? How to make a custom object?
  3. What is casting? What is its use?

If you look at the doc for PersistentObject, you will find a list of objects that are implicitly persistent - this includes the String and vector.  If you look at the Persistable doc, you will find a list of other objects that are persistable.  If you want to create a persistent object, you can create using or extend them, by ensuring that all of the classes that are added to the object (or collection) implement also Persistable, directly or by implication.

Note that you must explicitly define an as Persistable class.  If you say

class MyString extends {String

}

then MyString is not persistent.

I hope that now I understood and answered all of your questions!  Sorry to not do it at the beginning.

Tags: BlackBerry Developers

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