Ruby学习笔记(19)_继承

语法:

#class 子类名 < 父类名class SubClassName < ParentClassName

定义一个父类song

class Song    def to_s        "Song: #@name--#@artist (#@duration)"    endend

定义一个子类继承父类NewSong

class NewSong < Song    def initialize(name,artist,duration,lyrics)        super(@name,@artist,@duration)        @lyrics = lyrics    endend