MATLAB Object-Oriented Programming

function obj = padAccID(obj)

ac = obj.AccountID;

acstr = num2str(ac);

if length(acstr) < 12

obj.AccountID = [acstr,repmat('0',1,12-length(acstr))];

end

end

end

methods (Static)

function obj = loadobj(a)

if isstruct(a)

obj = MyAccount;

obj.AccountID = a.AccountID;

obj = padAccID(obj);

elseif isa(a,'MyAccount')

obj = padAccID(a);

end

end

end

end

You do not need to implement a saveobj method. You are using loadobj only to ensure

that older saved objects are brought up to date while loading.

Maintaining Compatible Versions of a Class

The PhoneBookEntry class uses a combination of techniques to maintain compatibility

with new versions of the class.

Suppose that you define a class to represent an entry in a phone book. The

PhoneBookEntry class defines three properties: Name, Address, and PhoneNumber.

classdef PhoneBookEntry

properties

Name

Address

PhoneNumber

end

end

However, in future releases, the class adds more properties. To provide flexibility,

PhoneBookEntry saves property data in a struct using its saveobj method.

13 Saving and Loading Objects