Ruby的访问控制public、protected、private
#Ruby的访问控制
public方法,可以被定义它的类和其子类访问,可以被类和子类的实例对象调用
protected方法,可以被定义它的类和其子类访问,不能被类和子类的实例对象直接调用,但是可以在类和子类中指定给实例对象
private方法,可以被定义它的类和其子类访问,私有方法不能指定对象。- class Person
- def speak
- puts "protected:speak."
- end
- def laugh
- puts "private:laugh."
- end
- protected :speak
- private :laugh
-
- def useSpeak(another)
- another.speak
- end
- def useLaugh(another)
- another.laugh
- end
- end
- p1=Person.new
- p2=Person.new
- p2.useSpeak(p1) #protected:speak
- #p2.useLaugh(p1) #E6.5-1.rb:21:in `useLaugh': private method `laugh' called for #<Person:0xb47188> (NoMethodError)
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复制代码 #Ruby语言的访问控制是动态的,是在程序运行时刻确立的
#可以根据自己的需要,在程序的不同位置,改变某个方法的访问控制级别- class Student
- def talk
- puts "i am a student."
- end
- private:talk
- end
- p=Student.new
- #p.talk #E6.5-1.rb:38:in `<main>': private method `talk' called for #<Student:0xb464b0> (NoMethodError)
- class Student
- public:talk
- end
- p=Student.new
- p.talk #i am a student
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