class Apple

def initialize

# instance variable,

@color

end

# getter

def color

return @color

end

# setter

def color = color

@color = color

end

# private 下面是私有方法

private

def i_am_private

end

end

red_apple = Apple.new

red_apple.color = 'red'

puts "red_apple.color: #{red_apple.color}"

#下面是报错

test.rb:14: syntax error, unexpected '=', expecting ';' or '\n'

        def color = color

                   ^

test.rb:22: syntax error, unexpected keyword_end, expecting end-of-input