forward-compatibility

Are FCM and GCM backward and forward compatible?

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问题 Google is deprecating Google Cloud messaging in favor of Firebase Cloud Messaging: Firebase Cloud Messaging (FCM) is the new version of GCM. It inherits the reliable and scalable GCM infrastructure, plus new features! See the FAQ to learn more. If you are integrating messaging in a new app, start with FCM. GCM users are strongly recommended to upgrade to FCM, in order to benefit from new FCM features today and in the future. From some tests I made on my servers, the FCM URL (https://fcm

Is JDK “upward” or “backward” compatible?

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Backward binary compatibility (or downward compatibility) - an ability of clients built with an old version of library API to run on a new one ( wiki ). Upward binary compatibility (or forward compatibility) - an ability of clients built with a new version of library API to run on old one ( wiki ). The general Sun's document about JDK Incompatibilities in J2SE 5.0 since 1.4.2 (and Java SE 6 compatibility with J2SE 5.0 too) describes the compatibility of JDK as following: JDK 5.0 is upwards binary-compatible with Java 2 SDK, v1.4.2 except for the incompatibilities listed below. This means that,

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