目录1. synchronized 锁2. ReentrantLock（可重入锁）3. ReadwriteLock（读写锁）4. StampedLock（Java 8+）5. 显式锁 vs 隐式锁6. 锁优化策略（JVM 对 synchronized 的优化）7.
I know this works: proc = Proc.new do puts self.hi + \' world\' end class Usa def hi \"Hello!\" end end Usa.new.instance_eval &proc
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