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error in kb6 book page no. 217

 
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please refer FROM THE CLASSROOM given in kb6 book page no. 217. following is a paragraph from the same

The preceding code appears to change the size instance variable in the changeIt() method,
but because changeIt() has a parameter named size, the local size variable is modified while
the instance variable size is untouched. Running class Foo prints



if you refer the program the book declares size as static variable but in the above paragraph it says size is an instance variable which is wrong. my question is that what the authors intended to say. if the variable is shadowed how do we come to know which variable are we talking about, local or instance/static. what are the rules and how to separate the distinction between shadowed variables?
 
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If we remove static keyword then it will become instance variable then it will work as it stated.This example shows shadowing in static context.
 
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