Error creating Weka instance object

Question

I was looking for a Weka programming example from http://weka.wikispaces.com/Programmatic+Use . However, I think that due to the version of my Weka jar (3.7.7) it gives an error in this line:

Instance iExample = new Instance(4); Error: Cannot instantiate the type Instance 

What change should I make in the code?

Answer 1

Well, according to this documentation Instance is an interface. That is why you get this error. You will need to create one of the implementation classes, for example

 Instance iExample = new DenseInstance(4); 

Perhaps this example is out of date.