importing java classes in matlab classdef

Question

I have a matlab class defined using classdef.

I'm creating a wrapper for some java stuff and need to import several classes.

I can't figure out where to import these classes, so far I can import them as needed in each method... which is painful.

any ideas?

Sam Roberts · Accepted Answer · 2013-05-06 22:39:58Z

3

Yes, you need to import them into each method, which is painful.

answered May 6, 2013 at 22:39

Sam Roberts

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Comments

Amro · Accepted Answer · 2013-05-06 21:48:58Z

1

A small test confirms that you need to repeat the import list in every method:

classdef MyClass < handle
    properties
        s
    end
    methods
        function obj = MyClass()
            import java.lang.String
            obj.s = String('str');
        end
        function c = func(obj)
            c = String('b');      %# error: undefined function 'String'
        end
    end
end

answered May 6, 2013 at 21:48

Amro

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Comments

Raimund Schlüßler · Accepted Answer · 2016-06-23 12:53:21Z

0

Both answers are not correct (anymore?). You can assign the imported classes to a property of the classobject and access them without reimporting. The following code works just fine (tested in Matlab 2016a):

classdef moveAndClick < handle
    properties (Access = private)
        mouse;
        leftClick;
    end

    methods
        %% Constructor
        function obj = moveAndClick()
            import java.awt.Robot;
            import java.awt.event.InputEvent;
            obj.mouse = Robot;
            obj.leftClick = InputEvent.BUTTON1_MASK;
        end

        %% Destructor
        function delete (~)
        end

        function moveClick (obj, positionX, positionY)
            % move mouse to requested position
            obj.mouse.mouseMove(positionX, positionY);

            % click on the current position
            obj.mouse.mousePress(obj.leftClick);
            obj.mouse.mouseRelease(obj.leftClick);
        end
    end
end

answered Jun 23, 2016 at 12:53

Raimund Schlüßler

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2 Comments

nirvana-msu Over a year ago

You are wrong. What you assign to the property is an object instance (created through an empty-argument constructor). You are then simply referring to this object instance, which has nothing to do with class imports. If you want to create another Robot() instance in moveClick, you have to import the class again.

Raimund Schlüßler Over a year ago

You are right, I misunderstood the question. Thanks for clarifying.

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