Here is some code: class Person def initialize(age) @age = age end def age @age end def age_difference_with(other_person) (self.age – other_person.age).abs end protected :age end What I want to know is the difference between using @age and self.age in age_difference_with method. 6 Answers 6
I read https://stackoverflow.com/questions/826734/when-do-ruby-instance-variables-get-set but I’m of two minds when to use class instance variables. Class variables are shared by all objects of a class, Instance variables belong to one object. There’s not much room left to use class instance variables if we have class variables. Could someone explain the difference between these two and when … Read more
Is there any advantage for either approach? Example 1: class A { B b = new B(); } Example 2: class A { B b; A() { b = new B(); } } 15 Answers 15
Suppose, I have a webserver which holds numerous servlets. For information passing among those servlets I am setting session and instance variables. Now, if 2 or more users send request to this server then what happens to the session variables? Will they all be common for all the users or they will be different for … Read more
Instance variable is the variable declared inside a class, but outside a method: something like: class IronMan { /** These are all instance variables **/ public String realName; public String[] superPowers; public int age; /** Getters and setters here **/ } Now this IronMan Class can be instantiated in another class to use these variables. … Read more
