线程的状态转换

o.wait()t.join()LockSupport.park()

new

NEW

线程被挂起

等待进入同步代码块的锁

线程的几种状态：创建、就绪、运行、阻塞、死亡

Blocked

start

o.notify()o.notifyAll()LockSupport.unpark()

Ready

Waiting

获得锁

Running

TimedWaiting

时间结束

Teminated

线程被调度器选中执行

Thread.yield

o.sleep(time)t.join(time)LockSupport.parkNanos()LockSupport.parkUnit()