线程的状态

作者：可爱猪猪 - 帅锅一枚
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人生理想：在程序猿界混出点名堂！

A thread state. A thread can be in one of the following states:

NEW
A thread that has not yet started is in this state.
RUNNABLE
A thread executing in the Java virtual machine is in this state.
BLOCKED
A thread that is blocked waiting for a monitor lock is in this state.
WAITING
A thread that is waiting indefinitely for another thread to perform a particular action is in this state.
TIMED_WAITING
A thread that is waiting for another thread to perform an action for up to a specified waiting time is in this state.
TERMINATED
A thread that has exited is in this state.
如下图：

Java线程的状态.png

是什么导致会出现这六种状态，以及六种状态是如何切换的，如下图：

Java 线程状态变迁.png

为什么线程是RUNABLE而不是RUNNING呢？
个人理解：因为线程执行的任务跟JVM和操作系统有关，比如JVM可能在执行垃圾回收STOP THE WORLD，因此任务会暂停或者操作系统上多个线程资源抢占，可能任务并没有抢到时间片，因此线程也没有在运行，因此Runnable状态的命名还是比较准确。