instance variables การใช้

• An instance variable is not a class variable although there are similarities.
• Instance variables are always defined in the @ implementation.
• Class methods also have no access to instance variables.
• A class variable is not an instance variable.
• The two kinds of variables commonly used in Smalltalk are instance variables and temporary variables.
• One object instance can change values of its instance variables without affecting all other instances.
• Each instance variable lives in memory for the life of the object it is owned by.
• Entity variables are like instance variables.
• Instance variables can be used by all methods of a class unless the method is declared as static.
• A category has full access to all of the instance variables within the class, including private variables.
• There is also the concept of instance variables, where a class variable is bound to a class instance.
• Scripts could access the properties of a container, corresponding to instance variables, using the get and set instructions.
• This is used both to modify instance variables of objects, as well as apply text styles to text fields.
• Assuming base, ligature, height and scale were not instance variables of self but were, in fact, methods.
• Like Smalltalk, in Objective-C, the instance variables and methods are defined by an object's class.
• With non-fragile instance variables in Objective-C 2.0 it is the best alternative amongst actively supported.
• Ruby s design forces all instance variables to be private, but also provides a simple way to declare set and get methods.
• One possible solution is to make instance variables private to their defining class and force subclasses to use accessors to modify superclass states.
• The docstring for a "'class "'should summarize its behavior and list the public methods and instance variables.
• This differs from instance variables, which are implicitly initialized with default values ( which are 0 for numbers and null for objects ).