众所周知，java编程语言的内容是极其丰富的，今天我们主要来了解一下java线程生命周期的状态有哪几种，并且展示一个源码实例。
首先，我们需要知道的是线程的任何生命周期，它在任何时刻都只能处于一种状态。同时线程的状态可以通过getState()方法获取，State是一个枚举类，它的位置在Thread中，有六种状态可以被称之为它的生命周期。
第一种是NEW: 它说明线程正处于新建状态，还没有调用start方法，线程生命周期第一个状态。
第二种是RUNNABLE: 可运行状态，在线程抢夺到了CPU时间片的情况下，才会执行，否则处于等待状态。
第三种是BLOCKED：被阻塞状态，主要是因为没有抢夺到synchronized的锁从而导致阻塞。
第四种是WAITING: 等待状态，比如调用了object.wait(),或者thread.join()导致的等待。
第五种是TIMED_WAITING: 计时等待，和上面的情况差不多，只是多了一个计时而已，在有效的时间结束后，线程会被激活。
第六种是TERMINATED: 被终止状态，它是线程生命周期最后的一个状态。
接下来用一个源码来展示。
public enum State
{
/**
* 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>
*
* <p>A thread in the waiting state is waiting for another thread to
* perform a particular action.
*
* For example, a thread that has called <tt>Object.wait()</tt>
* on an object is waiting for another thread to call
* <tt>Object.notify()</tt> or <tt>Object.notifyAll()</tt> on
* that object. A thread that has called <tt>Thread.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;
}以上这些内容都是java学习过程中需要了解的知识，想要了解更多关于java基础，敬请关注奇Q工具网。
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