链接：https://snailclimb.gitee.io/javaguide/#/docs/java/jvm/GC%E8%B0%83%E4%BC%98%E5%8F%82%E6%95%B0?id=jvm-%e9%85%8d%e7%bd%ae%e5%b8%b8%e7%94%a8%e5%8f%82%e6%95%b0 
