Subclasses can override superclass methods to support the greater specialization defined by the subclass. Because of the relationship that a subclass object is a superclass object, it is often useful to call the superclass version of the method before executing the specialized subclass code.
Subclass methods can call superclass methods if both methods have the same name. From the subclass, reference the method name and superclass name with the
This diagram illustrates how to call the
superMethod defined by
For example, a subclass can call a superclass
disp method to implement the display of the superclass part of the object. Then the subclass adds code to display the subclass part of the object:
classdef MySub < MySuperClass methods function disp(obj) disp@MySuperClass(obj) ... end end end
If you create a subclass object, MATLAB® calls the superclass constructor to initialize the superclass part of the subclass object. By default, MATLAB calls the superclass constructor without arguments. If you want the superclass constructor called with specific arguments, explicitly call the superclass constructor from the subclass constructor. The call to the superclass constructor must come before any other references to the object.
The syntax for calling the superclass constructor uses an
In the following class, the
MySub object is initialized by the
MySuperClass constructor. The superclass constructor constructs the
MySuperClass part of the object using the specified arguments.
classdef MySub < MySuperClass methods function obj = MySub(arg1,arg2,...) obj = obj@MySuperClass(SuperClassArguments); ... end end end
See Subclass Constructors for more information.