General class

[Dipke]

Hi,

I have several small classes(Service, client, device, ...)
Each with their own set of attributes and implemeting the same interface.
I want to create for each class an arrayList and serialize this list (Service.ser, client.ser, device.ser, ....).

I can create an class that takes an ArrayList<interface> and include the 4 major functions (save, read, add and search).
but then i can add a service to a device arraylist because both implements the interface

what is the right way of doing ?

Kind regards
Dipke

[Tolls]

So have specific Lists then.
The only reason to create a List<interface> is if you are happy adding any <interface> object to it.
If you want to ensure a List only has <Service> then it needs to be a List<Service>.

The code should reflect the logic, including what types are allowed in your collection.

[Dipke]

Hi,

So that means that instead of one general class, i have to create for each list a separate class with the list in it and implement the 4 functions (save, read, search and add).

Ex :
class Service with the attributes, getters, setters, equals, .....
class ServiceList with ArrayList<Service> and the 4 functions

kind regards

[Tolls]

Sounds like a use for generics.
If you haven't done those yet though then it would be separate classes.