Security Thread: reprint: https://mp.weixin.qq.com/s/WDeewsvWUEBIuabvVVhweA
Optimistic and pessimistic locking lock: Reproduced: https://mp.weixin.qq.com/s/WtAdXvaRuBZ-SXayIKu1mA
Concurrent face questions: https://mp.weixin.qq.com/s/cdHfTTvMpH60SwG2bjTMBw
Depth understanding of thread: https://mp.weixin.qq.com/s/PrUa0tFyu3UZllP2FRDyVA
