Ruby编程实践

class Person
def initialize(name,age=18)
    @name = name
    @age = age
    @motherland = "China"
end # initialize method
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 method
attr_writer:motherland
# attr_reader:motherland
end
p1 = Person.new("zhaosi",40)
p1.talk
p2 = Person.new("songxiaobao")
p2.motherland = "ABC"
p2.talk
# p2.motherland #open attr_reader:motherland


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

p3 = Student.new("xiaoshenyang",38)
p3.talk
p4 = Student.new("Ben")
p4.talk

class Person
    def talk
        puts "I am worker"
    end
end
p1 = Person.new
p1.talk

class Person
    def talk
        puts "I am #@stu"
    end
attr_accessor:stu
end
p2 = Person.new
p2.stu = "Student"
p2.talk

class Person
undef:talk
end
p3 = Person.new
p3.talk