MVC: update only one time

Question

Hi,
suppose I've this model class:
public class MyClass extends java.util.Observable {
     public MyClass(){}
     //get methods
     //set methods
     private int x;
     private int y;
     private int z;
     private int t;
     private int s;
}Now I want that, when I use more than one set method, observers are notified only one time.
That is,
if I have this calls:
MyClass obj = new MyClass();
obj.setX(1);
obj.setY(2);
obj.setZ(3);
obj.setT(4);
obj.setS(5);I want that the update method isn't called five times, but only one time.
I can't add setChanged() and NotifyObservers() in only one of the set method,
because I 'm interesting in knowing when the model has been modified.
I thought of adding a new set method like this:
setModified(){
   setChanged();
   notifyObservers();
}so, every time I want to notify observers, I run this method.
But, I want to know:
Is this the correct way to do?
Thank you in advance.
MargNat

Answer 1

No,
the five values doesn't always change all at once.
I can have this code in one class:
obj.setX(45);
obj.setY(46);and in another class this:
obj.setX(45);
obj.setZ(345);
obj.setT(345);I simply don't want the observers are called many times.
the values are indipendent among them, I don't want to have only one set method for them;
this isn't an object oriented approach.
Practically, I want to know where exactly must be placed setChanged() and notifyObservers() methods.
In all model methods?
In a specific method I can call every time I want to update?
I must call setChanged() and notifyObserver() directly, as example, like:
obj.setChanged()
obj.notifyObservers?
Thank you again.
MargNat