（2）虚拟线程开始执行 getCache()，执行到 Thread.sleep(50) 时，JVM 检测到这个操作会阻塞，于是：
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American singer-songwriter Neil Sedaka, who wrote and performed hits through the 1950s and 60s, including Oh! Carol, Breaking Up Is Hard To Do, Bad Blood, Laughter in the Rain and Calendar Girl, has died at the age of 86.，推荐阅读体育直播获取更多信息
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