Ruby笔记三（类、对象、属性）

凝望长空

Ruby笔记三（类、对象、属性）

1. class Person
   
2.   #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，
   
3.   #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   
   
4.   def initialize( name, age=18 )
   
5.     @name = name
   
6.     @age = age
   
7.     @motherland = "China"
   
8.   end #初始化方法结束
   
9.   
   
10.   def talk
    
11.     puts "my name is "+@name+", age is "+@age.to_s  #@age.to_s:将数@age转换为字符串。
    
12.     if @motherland == "China"
    
13.       puts "I am a Chinese."
    
14.     else
    
15.       puts "I am a foreigner."
    
16.     end
    
17.   end # talk方法结束
    
18.   attr_writer :motherland
    
19. =begin
    
20. attr_writer :motherland 相当于
    
21. def motherland=(value)
    
22.   return @motherland =value
    
23. end
    
24. 
    
25. attr_ reader :motherland 相当于
    
26. def motherland
    
27.   return @motherland
    
28. end  
    
29. 
    
30. attr_accessor :motherland 相当于
    
31. attr_reader:motherland;attr_writer :motherland
    
32. =end  
    
33. end # Person类结束
    
34. 
    
35. class Student < Person
    
36.   def talk
    
37.     puts "I am a student. my name is "+@name+", age is "+@age.to_s
    
38.   end # talk方法结束
    
39. end # Student类结束
    
40. 
    
41. p1=Person.new("kaichuan",20)
    
42. p1.talk #my name is kaichuan, age is 20 I am a Chinese.
    
43. 
    
44. p2=Person.new("Ben")
    
45. p2.motherland="ABC"
    
46. p2.talk #my name is Ben, age is 18 I am a foreigner.
    
47. p3=Student.new("kaichuan",25)
    
48. p3.talk #I am a student. my name is kaichuan, age is 25
    
49. 
    
50. p4=Student.new("Ben")
    
51. p4.talk #I am a student. my name is Ben, age is 18
    
52. 复制代码

复制代码

小鬼萌萌控

谢谢分享

yakczh

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