Ruby Classes and methods

Ruby provides four types of variables

Local variable: Lowercase letter or _ Start

Instance variable: an instance variable can span a method of any particular instance or object, meaning that an instance variable from an object to an object is changed. The instance variable is preceded by the at sign @, followed by the variable name

Class variables: Class variables are available in a variety of different objects a class variable belongs to a class is a feature of the class they precede the symbol @@ followed by the class variable name

Global variables: Class variables cannot span classes if you want a single variable that can cross a class need to define a global variable before the global variable is always preceded by a dollar sign $

=end

=begin

Using the new method in Ruby to create an object object is an instance of a class

=end

Class Customer

@ @no_of_customers = 0 #使用类变量 @@ To determine the number of objects created

@no_of_wheels

def initialize #重写初始化方法

@no_of_wheels = "324243234"

End

DEF initialize (wheels) #自定义初始化方法 Incoming parameters Wheels

@no_of_wheels = Wheels

End

def hello

Puts "hello#{@ @no_of_customers}#{@no_of_wheels}"

End

End

#调用对象方法

Object = Customer.new ("Werrwerwrew")

Object.hello

Ruby Classes and methods