Ruby笔记三（类、对象、属性）
Ruby笔记三（类、对象、属性）class Person#initialize是初始化方法,相当于Java的构造器。参数age有一个缺省值18，
#可以在任何方法内使用缺省参数,而不仅仅是initialize。如果有缺省参数，参数表必须以有缺省值的参数结
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#@age.to_s:将数@age转换为字符串。
if @motherland == "China"
puts "I am a Chinese."
else
puts "I am a foreigner."
end
end # talk方法结束
attr_writer :motherland
=begin
attr_writer :motherland 相当于
def motherland=(value)
return @motherland =value
end
attr_ reader :motherland 相当于
def motherland
return @motherland
end
attr_accessor :motherland 相当于
attr_reader:motherland;attr_writer :motherland
=end
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
p1=Person.new("kaichuan",20)
p1.talk #my name is kaichuan, age is 20 I am a Chinese.
p2=Person.new("Ben")
p2.motherland="ABC"
p2.talk #my name is Ben, age is 18 I am a foreigner.
p3=Student.new("kaichuan",25)
p3.talk #I am a student. my name is kaichuan, age is 25
p4=Student.new("Ben")
p4.talk #I am a student. my name is Ben, age is 18
复制代码 谢谢分享 类成员变量散落在各个方法里，很难看出这个类封装了什么东西
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