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java查询所有线程状态,linux查看java线程数

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java获取当前线程状态。

java线程的状态有下面几种状态:

/**

* Thread state for a thread which has not yet started.

*/

NEW,

/**

* Thread state for a runnable thread. A thread in the runnable

* state is executing in the Java virtual machine but it may

* be waiting for other resources from the operating system

* such as processor.

*/

RUNNABLE,

/**

* Thread state for a thread blocked waiting for a monitor lock.

* A thread in the blocked state is waiting for a monitor lock

* to enter a synchronized block/method or

* reenter a synchronized block/method after calling

* {@link Object#wait() Object.wait}.

*/

BLOCKED,

/**

* Thread state for a waiting thread.

* A thread is in the waiting state due to calling one of the

* following methods:

* ul

* li{@link Object#wait() Object.wait} with no timeout/li

* li{@link #join() Thread.join} with no timeout/li

* li{@link LockSupport#park() LockSupport.park}/li

* /ul

*

* pA thread in the waiting state is waiting for another thread to

* perform a particular action.

*

* For example, a thread that has called ttObject.wait()/tt

* on an object is waiting for another thread to call

* ttObject.notify()/tt or ttObject.notifyAll()/tt on

* that object. A thread that has called ttThread.join()/tt

* is waiting for a specified thread to terminate.

*/

WAITING,

/**

* Thread state for a waiting thread with a specified waiting time.

* A thread is in the timed waiting state due to calling one of

* the following methods with a specified positive waiting time:

* ul

* li{@link #sleep Thread.sleep}/li

* li{@link Object#wait(long) Object.wait} with timeout/li

* li{@link #join(long) Thread.join} with timeout/li

* li{@link LockSupport#parkNanos LockSupport.parkNanos}/li

* li{@link LockSupport#parkUntil LockSupport.parkUntil}/li

* /ul

*/

TIMED_WAITING,

/**

* Thread state for a terminated thread.

* The thread has completed execution.

*/

TERMINATED;

java多线程有哪些状态?

初始态:一个线程调用了new方法之后,并在调用start方法之前的所处状态。

就绪:一旦线程调用了start 方法,线程就转到Runnable 状态。

阻塞/ NonRunnable:线程处于阻塞/NonRunnable状态,这是由两种可能性造成的:要么是因挂起而暂停的,要么是由于某些原因而阻塞的,例如包括等待IO请求的完成。

停止/退出:线程转到退出状态,这有两种可能性,要么是run方法执行结束,要么是调用了stop方法。

如何查看一个java进程有多少个线程在工作?

理论上来说,如果你全用threadgroup来跑线程的话,有个叫enumerate的方法可以得到【该threadgroup下】所有active的(也就是你说的在工作的)线程以及子线程,但程序里面不一定是把线程放threadgroup里面的,有可能有人自己new一个出来run或者别的,所以不能完全依靠这个办法。我目前想到的办法,貌似得弄个全局的counter,开个守护线程,让这个线程去数监控所有线程的状态,依照线程是否Active去加减这个counter。

还有个懒点的,你看windows的taskmanager(假设你在win平台上的话),里面有一个column叫做thread count的,我没试过到底准不准,不过这个最省事了,右键点出来一看就知道了。