MATLAB: Abstract Java Classes In Matlab

java

Hi, How can Java abstract classes be used in Matlab? More specifically how can they be extended?

Thanks.

Best Answer

To the best of my knowledge, Java abstract classes cannot generally be used in Matlab, since you cannot instantiate an object of an abstract class (duh!). If the abstract class has some static methods or fields, then you can use them, but this is not the case in general.

To extend such classes, create a new Java class that extends them, and this can then be used within Matlab.

To explore the contents of Java classes (including abstract classes) in Matlab, you can use my UIINSPECT and CheckClass utilities on the Matlab File Exchange (they accept a class name as input arg).

Related Solutions

MATLAB: Accessing subclass methods from abstract superclass

classdef (Abstract) ParentClass
    %PARENTCLASS Testing properties of abstract classes
    
    methods (Abstract = true, Static = true)
        doA();
        doB();
    end
    
    methods (Static = true)
        function doC()
            doA();
            doB();
        end
    end
end

This doesn't do what you think. Normally Static methods are called using the name of the class that defines them, though they can be called on class instances like non-Static methods. Since doC is Static and accepts no inputs, it can only be called via a class name.

Nothing in the code you've written makes it possible to call any class methods doA or doB. They are not called as Static methods with a class name, nor do they accept any inputs. So there's nothing telling MATLAB it should call the methods of either ParentClass or ChildClass. Unless there are functions doA and doB (not methods) ParentClass.doC() would error.

If you use per isakson's approach, doA and doB probably shouldn't be Static in either ParentClass or ChildClass.

MATLAB: Function referring to abstract class

Your problem description suggests to me that you might want to structure your classes according to the Strategy design pattern with a special Null object concrete strategy. I would recommend you make a package to hold your Abstract class and its concrete children.

For example, create a package folder named +CTInterfaces containing Abstract, Null, Plannar, and whatever else. Your layer class could then use Null as the default:

properties
   interfaceT = CTInterfaces.Null;
   interfaceB = CTInterfaces.Null;
end

Best Answer

Related Solutions

MATLAB: Accessing subclass methods from abstract superclass

MATLAB: Function referring to abstract class

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