"ismethod" on restricted methods

i have class A with a method which is restricted to only be accessible by class B. When i am in class B i want to make sure that class A has this method. "ismethod" however does not work since the method is restricted. I think there should be some way to do this, since i am able to run the method from within B. I could do this with try & catch, but there must be a nicer solution to this.

% class A
classdef classA
    methods (Static, Access = ?classB)
        function method1
            disp("hello, this is method1")
        end
    end
end

% class B
classdef classB
    methods (Static)
        function flag = CheckForMethod1(anotherClass)
            flag = ismethod(anotherClass, 'method1'); % = false
            anotherClass.method1; % this works
        end
    end
end

% Main
A = classA;
B = classB;
B.CheckForMethod1(A) % should return true, but returns false

Answer 1

[per isakson]

This works

function flag = CheckForMethod1(anotherClass)
    mc = metaclass( anotherClass );
    flag = ismember( 'method1', {mc.MethodList.Name} );
    anotherClass.method1; % this works
end

The function, ismethod, is restricted to public methods by design - I guess.