Ruby 类的创建

class Language 
　　def initialize(name, creator)
　　　　@name = name
　　　　@creator = creator
　　end

　　def description
　　　　puts "I‘m #{@name} and I was created by #{@creator}!"
　　end
end

ruby = Language.new("Ruby", "Yukihiro Matsumoto")
python = Language.new("Python", "Guido van Rossum")
javascript = Language.new("JavaScript", "Brendan Eich")

ruby.description
python.description
javascript.description

1. 类名首字母大写，NewClass (方法名首字母小写，多个单词用下划线连接)
2. 初始化函数 initialize, 参数为name, creator
3. 实例变量赋值@name = name (python self.name = name)
4. 创建实例 ruby = Language.new("Ruby", "Yukihiro Matsumoto")
5. 调用类函数 ruby.description
6. @关键字 + 变量名 表示该变量为实例变量