摘要：Single Responsibility CityPair CityPairConverter rather than add convert method inside CityPair Open for Extension, Closed for Modification Policy Nfd 阅读全文

摘要：background knowledge CallSite, a holder of MethodHandler, which is called its target. Field Descriptors: https://docs.oracle.com/javase/specs/jvms/se1 阅读全文

摘要：MethodHandle仅在创建时检查可访问性，Reflection在Runtime Java9支持bind，可以用来实现柯里化（Currying） 据某网友说，Reflection后续会使用MethodHandle重新实现(JDK18 or 19) 参考： https://www.baeldung 阅读全文