Thread.join() 的使用和例子执行结果：counter 0 sleep 93 mscounter 2 sleep 864 mscounter 1 sleep 3193
Thread.join() 的使用和例子
执行结果：counter 0 sleep 93 mscounter 2 sleep 864 mscounter 1 sleep 3193 msall time = 3969 msresult = 15counter 3 sleep 3639 mscounter 4 sleep 4806 ms