Ruby学习之undef_method

#父类的定义
class Base
        def meth
            puts "This is Base#meth"
        end
end

#继承类Derived的定义
class Derived < Base
        def meth
            puts "This is Derived#meth"
        end

        #Derived的实例方法obj2.meth没有定义
        undef_method(:meth)
end

#类Test1继承Derived
class Test < Derived
        def meth
            puts "This is Test1#meth"
        end

     #
        undef_method(:meth)
end

#Test的实例方法obj1.meth没有定义
obj1 = Test.new
obj2 = Derived.new
obj1.meth
obj2.meth