I use this app # CSDN# found have technical content of the blog and friends to seek common to "a god put Java multi-thread, lock, JMM, JUC and high concurrent design mode will see", gathered together at https://blog.csdn.net/Javachichi/article/details/117200742? Utm_source=app& App_version=4.7.1 & amp; Code=app_1562916241 & amp; ULinkId=usr1mkqgl919blen