Web Reference: Jul 6, 2009 · I have some questions regarding the usage and significance of the synchronized keyword. What is the significance of the synchronized keyword? When should methods be synchronized? What does it mean 3 Synchronized has two effects: First, it is not possible for two invocations of synchronized methods on the same object to interleave. When one thread is executing a synchronized method for an object, all other threads that invoke synchronized methods for the same object block (suspend execution) until the first thread is done with the object. 在 Java 中,"synchronized" 关键字的性能开销比较大,因为每个线程都需要获取锁才能访问被修饰的代码。 为了优化 "synchronized" 关键字的性能,Java 6 及之后的版本中引入了偏向锁、轻量级锁和重量级锁等优化策略。 偏向锁是一种针对单线程访问同步块的优化策略。
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