PBR/Light Transport
It's always a good deal when a TV drops to its best-ever price. For a limited time, the Samsung 55-inch QN80F Neo QLED 4K TV is $600 off. Yes, you read it right. As of Feb. 27, this impressive TV is on sale for its lowest-ever price, and the savings are big. This hefty discount takes the price down from $1,297.99 to $697.99, just shy of half off.，详情可参考heLLoword翻译官方下载
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正确做法： 用 java.util.concurrent.locks.ReentrantLock 代替 synchronized，因为 Lock 的等待可以被 JVM 处理为可卸载。