链接：https://pan.baidu.com/s/1urGcuMtdWPMqq-X0w7gvZA 

提取码：uht6 

 

VM Overview • Compiler focus on object-oriented optimizations > Deep inlining > Class hierarchy analysis > Virtual call inlining > Dynamic deoptimization • No handles: direct object references, aka oops > Exact GC: Root set in globals, thread stacks,

machine registers, VM data structures • Reflection metadata stored in Java heap > Class, method objects become garbage when class is unloaded