class Model
  def initialize()   
       puts "Model initialize\n"
  end

  def see
       puts " table is  " + @table
  end

  def add(u)
       puts "insert into " + @table+ "values " +u
   end

end
-------------------------------------------
class User < Model
  def initialize    
     @table='user'  
     puts "User Initalize"
  end  

  def log
     print @table
   end
end


a=User.new
a.see
u="xxx"
a.add(u)
a.log

如果只看父类，会不会觉得这个@table变量不知道是从哪冒出来的