class Student < Person

最新推荐文章于 2024-04-23 09:17:09 发布

转载最新推荐文章于 2024-04-23 09:17:09 发布 · 757 阅读

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本文通过定义Person和Student类并实现talk方法，展示了在Ruby中如何使用继承及方法重写来定制不同子类的行为。同时介绍了如何设置默认属性值及如何使用attr_writer来提供setter方法。

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# encoding: utf-8
#E4.4-1.rb ，接着上一节的代码，添加如下：
class Person
def initialize( name, age=18 )
@name = name
@age = age
@motherland = "China"
end #初始化方法结束
def talk
puts "my name is "+@name+", age is "+@age.to_s
if @motherland == "China"
puts "I am a Chinese."
else
puts "I am a foreigner."
end
end # talk方法结束
attr_writer :motherland
end # Person类结束

class Student < Person
def talk
puts "I am a student. my name is "+@name+", age is "+@age.to_s
end # talk方法结束
end # Student类结束

p3=Student.new("kaichuan",25); p3.talk
p4=Student.new("Ben"); p4.talk

=begin
I am a student. my name is kaichuan, age is 25
I am a student. my name is Ben, age is 18
请按任意键继续. . .
=end