如何尽可能地使10个线程同时开始工作
在多线程编程中，我们很难控制线程的具体启动时间，调用线程的Start()只是启动一个线程，使其处于就绪阶段，至于什么时候CPU开始执行线程Run方法，这是操作系统调度决定的，在理论上，如果有多个CPU，操作系统的调度可能使的多个线程真正同时开始，但是在单CPU的机器上，是没法做到多个线程真正同时启动的。我们只能尽可能地使得线程之间的启动间隔很短，模拟多个线程同时启动。下面这个程序模拟一个有10辆赛车参加的赛车比赛，通过使用CountDownLatch来控制10辆赛车尽可能地同时启动。
?该程序的执行结果为：
Thread 1 start's time is :1304690372640Thread 9 start's time is :1304690372640Thread 8 start's time is :1304690372640Thread 10 start's time is :1304690372640Thread 12 start's time is :1304690372640Thread 11 start's time is :1304690372640Thread 13 start's time is :1304690372640Thread 18 start's time is :1304690372640Thread 19 start's time is :1304690372640Thread 14 start's time is :1304690372640Thread 42 start's time is :1304690372656Thread 46 start's time is :1304690372656Thread 47 start's time is :1304690372656Thread 49 start's time is :1304690372656Thread 51 start's time is :1304690372656Thread 53 start's time is :1304690372656Thread 54 start's time is :1304690372656Thread 61 start's time is :1304690372656Thread 67 start's time is :1304690372656Thread 69 start's time is :1304690372656Thread 71 start's time is :1304690372656Thread 73 start's time is :1304690372656Thread 75 start's time is :1304690372656Thread 77 start's time is :1304690372656Thread 74 start's time is :1304690372656Thread 76 start's time is :1304690372656Thread 82 start's time is :1304690372656Thread 68 start's time is :1304690372656Thread 16 start's time is :1304690372640Thread 15 start's time is :1304690372640Thread 102 start's time is :1304690372656Thread 103 start's time is :1304690372656Thread 96 start's time is :1304690372656Thread 99 start's time is :1304690372671Thread 44 start's time is :1304690372656Thread 100 start's time is :1304690372671Thread 101 start's time is :1304690372671Thread 45 start's time is :1304690372656Thread 104 start's time is :1304690372656Thread 105 start's time is :1304690372656Thread 97 start's time is :1304690372656Thread 106 start's time is :1304690372656Thread 107 start's time is :1304690372656Thread 43 start's time is :1304690372656Thread 94 start's time is :1304690372656Thread 93 start's time is :1304690372656Thread 95 start's time is :1304690372656Thread 92 start's time is :1304690372656Thread 89 start's time is :1304690372656Thread 91 start's time is :1304690372656Thread 87 start's time is :1304690372656Thread 90 start's time is :1304690372656Thread 88 start's time is :1304690372656Thread 84 start's time is :1304690372656Thread 86 start's time is :1304690372656Thread 85 start's time is :1304690372656Thread 80 start's time is :1304690372656Thread 83 start's time is :1304690372656Thread 78 start's time is :1304690372656Thread 70 start's time is :1304690372656Thread 72 start's time is :1304690372656Thread 81 start's time is :1304690372656Thread 79 start's time is :1304690372656Thread 66 start's time is :1304690372656Thread 64 start's time is :1304690372656Thread 65 start's time is :1304690372656Thread 63 start's time is :1304690372656Thread 62 start's time is :1304690372656Thread 60 start's time is :1304690372656Thread 59 start's time is :1304690372656Thread 58 start's time is :1304690372656Thread 57 start's time is :1304690372656Thread 56 start's time is :1304690372656Thread 55 start's time is :1304690372656Thread 52 start's time is :1304690372656Thread 50 start's time is :1304690372656Thread 48 start's time is :1304690372656Thread 28 start's time is :1304690372640Thread 27 start's time is :1304690372640Thread 41 start's time is :1304690372656Thread 40 start's time is :1304690372656Thread 34 start's time is :1304690372656Thread 39 start's time is :1304690372656Thread 38 start's time is :1304690372656Thread 37 start's time is :1304690372656Thread 36 start's time is :1304690372656Thread 35 start's time is :1304690372656Thread 26 start's time is :1304690372640Thread 33 start's time is :1304690372656Thread 32 start's time is :1304690372656Thread 31 start's time is :1304690372656Thread 30 start's time is :1304690372656Thread 29 start's time is :1304690372656Thread 25 start's time is :1304690372640Thread 23 start's time is :1304690372640Thread 24 start's time is :1304690372640Thread 20 start's time is :1304690372640Thread 21 start's time is :1304690372640Thread 22 start's time is :1304690372640Thread 17 start's time is :1304690372640Thread 98 start's time is :1304690372671。。。。省去了end time的打印??