1.ReentrantLock-Condition实现三个线程交替打印1-75
比如结果
* Thread[pool-1-thread-1,5,main]1
* Thread[pool-1-thread-2,5,main]2
* Thread[pool-1-thread-3,5,main]3
* Thread[pool-1-thread-1,5,main]4
* Thread[pool-1-thread-2,5,main]5
* Thread[pool-1-thread-3,5,main]6
* Thread[pool-1-thread-1,5,main]7
* Thread[pool-1-thread-2,5,main]8
* Thread[pool-1-thread-3,5,main]9
* ...
* Thread[pool-1-thread-1,5,main]73
* Thread[pool-1-thread-2,5,main]74
* Thread[pool-1-thread-3,5,main]75