保持java线程间可见性的5种方式

Primitive Writes up to and including… ...are made visible to…

Object	the end of a synchronized block or method	a thread entering a synchronized block or method for the same object.
Volatile field	a write to a volatile field	any thread reading that volatile field.
Thread	a call to Thread.start	the newly started thread.
Thread	the final write made by a dying thread	any thread which successfully calls Thread.join on that thread.
Final field	the initialization of a final field (but only those writes affecting the field and any object it references)	any thread, provided that the constructor of the object containing the field doesn’t write the value of this anywhere eventually visible to other threads

  这些在《java并发编程实践》一书中已经有详细解释，特别是对于ReentrantLock、volatile域以及final域的讨论。今天在MenTaLguY的blog上看到这张表，摘录下。