Variable types in smalltalk

Question

I need help understanding the usage and the difference of variables in Smalltalk. What is the difference and the usage of each variable in the given code below?

<         


        

Answer 1

variables are identifiers. A variable holds a reference to some object.

instanceVariableNames: here x belongs to an instance of a class.

classVariableNames: here Yy have a copy of the variable shared with all instances of all classes, and it can be static a variable. so x can have different values across different objects. But Yy can have only one value.

poolDictionaries: are created in smallTalk to provide access to variables shared among a group of classes

category 'helpme' is a collection of related classes, if you create your class without a category; the class gets created with a blank category.

subclass has its own instanceVariableNames(zzz), also has the inheritance property.