Java线程的几种状态(基于Oracle jdk 1.8)

Java中线程的状态定义在java.lang.Thread类中的一个枚举中。

 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;
     }

NEW ： 该状态线程对象被创建，但还未调用start方法。
RUNNABLE : 线程运行在虚拟机上，但是可能正在等待操作系统的资源
BLOCKED：处于该状态的线程正在等待获取一个监视器锁进入同步代码或方法；也可能是在调用了Object.wait后等待一个监视器锁重新进入同步代码或方法。
WAITING：线程处于等待状态；处于该状态的线程可能是因为调用了Object#wait()，Thread#join，LockSupport#park()中的某一个方法；处于该状态的线程正在等待其他线程完成一些特定的操作。
TIMED_WAITING：线程处于`定时`等待状态，这个等待是有具有指定时间的；处于这个状态的线程可能是调用了具有指定时间的Thread.sleep/Object#wait(long)/#join(long)/LockSupport#parkNanos/LockSupport#parkUntil
TERMINATED：执行完毕