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Index › Programming Questions & Help › Processing Implementations › Accessing Java Constants in ruby-processing
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Accessing Java Constants in ruby-processing (Read 1297 times)
Elaine S.
Accessing Java Constants in ruby-processing
May 19th, 2009, 7:15pm  
I am trying to access a constant in a java class of the form class.CONSTANT from ruby-processing, but am getting an error:

undefined method 'ON_PRESS' for Java::Procontroll::ControllIO:Class (NoMethodError)

My code:

ON_PRESS = ControllIO.ON_PRESS

I can access the methods of ControllIO without any problems.

Do I need to do something special to get at class constants?
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jashkenas
Re: Accessing Java Constants in ruby-processing
Reply #1 - May 20th, 2009, 5:24am  
Nothing special, you just need to use Ruby syntax for accessing it. In Java, you can access any "member" of an object, be it a method or another object, by saying "object.member". In Ruby, using the dot means a method call, which is why it's complaining about the undefined method. Do this instead:

ControllIO::ON_PRESS

That should make the error make more sense, you can see how

Java::Procontroll::ControllIO

Is a really a class nested inside of two modules.

Good luck with the project.
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