Java GC日志可以通过 +PrintGCDetails开启 以ParallelGC为例 YoungGC日志解释如下（图片源地址：这里） ： FullGC（图片源地址：这里）： 一目了然，一图胜千言

Every developer who uses Java knows that Java bytecode runs in a JRE (Java Runtime Environment). The most important element of the JRE is Java Virtual Machine (JVM), which analyzes and executes Java