本文探讨了多线程环境下共享可变数据时所面临的挑战，强调了同步操作的重要性，并提出了避免使用Thread.stop的方法，建议采用布尔变量来控制线程。此外，文章还提到了在同步方法或代码块内不要将控制权交给客户端，以防出现活锁和安全性问题。
- confine mutable data to a single thread.
- when multiple threads share mutable data, each thread that reads or writes the data must perform synchronization.
- synchronization has no effect unless both read and write
- operations are synchronized。
- Do not use Thread.stop. use boolean control the thread.
- To avoid liveness and safety failures, never cede control to the client within a synchronized method or block.
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