On my machine output of your code is: Before After Middle. If you want to print Middle before After you need to add t2.join() method call ... ... <看更多>

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System.out.println("Thread.sleep");. for (int i = 0; i < 100; i++) {. long start = System.nanoTime();. TimeUnit.MILLISECONDS.sleep(20);. long time = System. ... <看更多>

2. Awakening a sleeping thread again works by timed interrupts, typically generated by an interrupt clock, which is a hardware component ... ... <看更多>