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Ruby筆記三（類、對(duì)象、屬性） [復(fù)制鏈接]

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發(fā)表于 2012-02-24 22:58 |只看該作者 |倒序?yàn)g覽

Ruby筆記三（類、對(duì)象、屬性）

class Person
#initialize是初始化方法,相當(dāng)于Java的構(gòu)造器。參數(shù)age有一個(gè)缺省值18，
#可以在任何方法內(nèi)使用缺省參數(shù),而不僅僅是initialize。如果有缺省參數(shù)，參數(shù)表必須以有缺省值的參數(shù)結(jié)
def initialize( name, age=18 )
@name = name
@age = age
@motherland = "China"
end #初始化方法結(jié)束
def talk
puts "my name is "+@name+", age is "+@age.to_s #@age.to_s:將數(shù)@age轉(zhuǎn)換為字符串。
if @motherland == "China"
puts "I am a Chinese."
else
puts "I am a foreigner."
end
end # talk方法結(jié)束
attr_writer :motherland
=begin
attr_writer :motherland 相當(dāng)于
def motherland=(value)
return @motherland =value
end
attr_ reader :motherland 相當(dāng)于
def motherland
return @motherland
end
attr_accessor :motherland 相當(dāng)于
attr_reader:motherland;attr_writer :motherland
=end
end # Person類結(jié)束
class Student < Person
def talk
puts "I am a student. my name is "+@name+", age is "+@age.to_s
end # talk方法結(jié)束
end # Student類結(jié)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
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發(fā)表于 2012-02-24 22:58 |只看該作者

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