Android Question [Solved] Classes Quiz ^__^

[LucaMs]

Today I spent too much time at the pc: 25/24 hours instead of the usual 22/24 , so I'm a little tired
and I do not think I can explain what I mean to ask.

In addition, after the failure of one of my previous similar question...!

Given the "impossibility" of using global variables:

If I have a CLASS "Student" (not an instance-object) and a CLASS "Students" (which will contain some Student objects, when instantiated), how can I inform Students (object) that a property of a Student object has been changed?
I mean how to design(project-plan) this directly in the classes!


It seems, but I'm not mad (not fully )

 

[Picena Informatica]

create a public method in student class and call it.

 

[LucaMs]

create a public method in student class and call it.

Too brief .

What do you mean? What kind of method? What should it do?

But thanks for your answer!!!

 

[LucaMs]

Uhm... maybe I could set a property in Student like "LastUpdate" (unfortunately, I should set it on each property and method, or almost)
and Students should check it (again unfortunately, in the first line of each property/method and on all Student children!).

Any other suggestion?

 

[derez]

I think it is similar to TreeView http://www.b4x.com/android/forum/threads/class-treeview-class-tree-and-node.19082/
There are two classes - Tree and Node. Node objects are created by the tree object, nodes call tree object by label_click and label_longClick, to perform changes (like add more nodes).
I use btn_click to do things inside the node itself.

 

[LucaMs]

another "not ideal" solution:

an array (or list or map) in the Student which contains references to the Parents (all Students objects) to be informed of any changes.

Example:
' Project code
Students.AddStudent(FirstStudent)

' Students Class
Public Sub AddStudent(Student as clsStudent)
...
...
Student.AddParent(Me)
End Sub

' Student Class
public Sub setName(Name as String)
mName = Name
InformParents
End Sun


Could that "me" work?

 

[LucaMs]

I think it is similar to TreeView http://www.b4x.com/android/forum/threads/class-treeview-class-tree-and-node.19082/
There are two classes - Tree and Node. Node objects are created by the tree object, nodes call tree object by label_click and label_longClick, to perform changes (like add more nodes).
I use btn_click to do things inside the node itself.

Many thanks, derez.

I will certainly give a look at your code.

Now I'm really too tired !!!

Thanks

 

[LucaMs]

I solved.

The attached project shows how to solve the "quiz" (I could say that it is a kind of Trigger between objects).