使用内在锁时，您将在线程转储中获得“等待锁”，而使用java.util.concurrent中的锁时，将获得“停放以等待”。考虑以下示例：
import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;public class LockTest { final Lock lock = new ReentrantLock(true); synchronized void intrinsicLock() { Thread th = new Thread(new Runnable() { public void run() { intrinsicLock(); } }, "My thread"); th.start(); try { th.join(); } catch (InterruptedException e) { } } void reentrantLock() { lock.lock(); Thread th = new Thread(new Runnable() { public void run() { reentrantLock(); } }, "My thread"); th.start(); try { th.join(); } catch (InterruptedException e) { } lock.unlock(); } public static void main(String[] args) { LockTest lockTest = new LockTest(); lockTest.intrinsicLock(); //lockTest.reentrantLock(); }}随着
lockTest.intrinsicLock()您将获得以下线程转储：
"My thread" prio=10 tid=0x00007fffec015800 nid=0x1775 waiting for monitor entry [0x00007ffff15e5000] java.lang.Thread.State: BLOCKED (on object monitor) at LockTest.intrinsicLock(LockTest.java:9) - waiting to lock <0x00000007d6a33b10> (a LockTest) at LockTest$1.run(LockTest.java:11) at java.lang.Thread.run(Thread.java:662)
同时
lockTest.reentrantLock()产生：
"My thread" prio=10 tid=0x00007fffec082800 nid=0x17e8 waiting on condition [0x00007ffff14eb000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000007d6a33d30> (a java.util.concurrent.locks.ReentrantLock$FairSync) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:842) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1178) at java.util.concurrent.locks.ReentrantLock$FairSync.lock(ReentrantLock.java:201) at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262) at LockTest.reentrantLock(LockTest.java:22) at LockTest$2.run(LockTest.java:25) at java.lang.Thread.run(Thread.java:662)
