Creating a Subclass [AX 2012]
Updated: September 30, 2011
Applies To: Microsoft Dynamics AX 2012 R2, Microsoft Dynamics AX 2012 Feature Pack, Microsoft Dynamics AX 2012
Subclasses are classes that extend (inherit from) other classes. In X++, a new class can only extend one other class; multiple inheritance is not supported. If you extend a class, it inherits all the methods and variables in the parent class (the superclass).
Subclasses enable you to reuse existing code for a more specific purpose, saving time on design, development, and testing. To customize the behavior of the superclass, override the methods in your subclass.
For more information about overriding a method, see Overriding a Method.
The following example creates a class called Point and extends it to create a new class called ThreePoint.
class Point
{
// Instance variables
real x;
real y;
;
// Constructor to initialize x and y
static new(real _x, real _y)
{
x = _x;
y = _y;
}
}
class ThreePoint extends Point
{
// Additional instance variable; x and y are inherited
real z;
;
// Constructor is overridden to initialize z
static new(real _x, real _y, real _z)
{
// Initialize the variables
super(_x, _y);
z = _z;
}
}
