When to select ReentrantLock over synchronized

什么时候选择用 ReentrantLock 代替 synchronized

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Listing 1. Protecting a block of code with ReentrantLock.

清单1 .用ReentrantLock保护代码块。

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Or even rewrite our existing synchronized code in terms of ReentrantLock?

或者甚至用ReentrantLock重写我们现有的synchronized代码？

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