ruby - 1

class Greeter
    attr_reader :name;
    attr_writer :name;
    def initialize(name = "World")
        @name = name;
    end
    def sayhello
        puts "Hello #{@name}";
    end

    def saygoodbye
        puts "good bye #{@name}, come back soon."
    end
    def getname
        return @name;
    end
    def setname name
        @name = name;
    end
end
test = Greeter.new("ll");
test.sayhello;
#puts test.name; #无法访问,可以使用attr_accessor :name，这样，ruby就会自动建立2个方法：name和name=，分别对应getname
#和setname方法
puts test.name;
puts test.getname;
test.setname("liujun");
test.name = "liujun";
test.saygoodbye;
puts Greeter.instance_methods(false); #用户自定义方法
puts test.respond_to?("sayhello", true);
puts test.respond_to?("saygoodbye", false);
puts test.respond_to?("name=");