String#intern
https://tech.meituan.com/2014/03/06/in-depth-understanding-string-intern.html
JVM
https://www.google.com/search?ei=NlblXLvoLZegvQSUlpnIDg&q=jdk8元区域&oq=jdk8元区域&gs_l=psy-ab.3...5916.7595..7931...0.0..0.181.326.0j2…0…1…gws-wiz.tGs9y2Y2m3Y
美团技术贴
https://tech.meituan.com/
