MATLAB Object-Oriented Programming

Call Only Direct Superclass from Constructor

Call only direct superclass constructors from a subclass constructor. For example,

suppose class B derives from class A and class C derives from class B. The constructor for

class C cannot call the constructor for class A to initialize properties. Class B must

initialize class A properties.

The following implementations of classes A, B, and C show how to design this relationship

in each class.

Class A defines properties x and y, but assigns a value only to x:

classdef A

properties

x

y

end

methods

function obj = A(x)

...

obj.x = x;

end

end

end

Class B inherits properties x and y from class A. The class B constructor calls the class A

constructor to initialize x and then assigns a value to y.

classdef B < A

methods

function obj = B(x,y)

...

obj@A(x);

obj.y = y;

end

end

end

Class C accepts values for the properties x and y, and passes these values to the class B

constructor, which in turn calls the class A constructor:

classdef C < B

methods

function obj = C(x,y)

12 How to Build on Other Classes