/+Package/Car.m, parent class
/+Package/Sedan.m, child class
/test.m

classdef Car
    properties (Access = private)
        producer
    end

    methods
        % Constructor
        function self = Car(p)
            self.producer = p;
        end
        
        % Accessor
        function p = getProducer(self)
            p = self.producer;
        end
        function disp(self)
            fprintf('Producer: %s\n', self.producer);
        end
        
        % Mutator
        function self = setProducer(self, p)
            self.producer = p;
        end
    end
end
			

classdef Sedan < Package.Car
    properties (Access = private)
        model
    end

    methods
        % Constructor
        function self = Sedan(p, m)
            self = self@Package.Car(p);
            self.model = m;
        end
        
        % Accessor
        function p = getModel(self)
            p = self.model;
        end
        function disp(self)
            disp@Package.Car(self)
            fprintf('Model: %s\n', self.model);
        end
        
        % Mutator
        function self = setModel(self, m)
            self.model = m;
        end
    end
end
		

function test()
    c = Package.Car('Honda');
    c.disp();
    
    s = Package.Sedan('Honda', 'CRV');
    s.disp();
end
	

• Define an Interface Subclass