// the model counts how many times incStatus was called

class Model {

    IModelListener l; 
    int c = 0; 

    // -------------------------------------------------------

    public int incStatus() {
	c++; 
	l.notifyListener(c); 
	return c; 
    }

    public void addListener(IModelListener l) {
	this.l = l; 
    }
}