示例：

    1. public class ReentrantLockConditionDemo {
    3.     static ReentrantLock lock = new ReentrantLock(true);
    4.     static Condition condition = lock.newCondition();
    5.     public static void main(String[] args) {
    6.         new Thread() {
    7.             public void run() {
    8.                 lock.lock();
    9.                 System.out.println("第一个线程加锁");
    10.                 try {
    11.                     System.out.println("第一个线程释放锁并等待");
    12.                     condition.await();
    13.                     System.out.println("第一个线程重新获取锁");
    14.                 } catch (InterruptedException e) {
    15.                     e.printStackTrace();
    16.                 }
    17.                 lock.unlock();
    18.                 System.out.println("第一个线程释放锁");
    19.             };
    21.         }.start();
    23.         try {
    24.             Thread.sleep(1000);
    25.         } catch (InterruptedException e) {
    26.             e.printStackTrace();
    27.         }
    29.         new Thread() {
    31.             public void run() {
    32.                 lock.lock();
    33.                 System.out.println("第二个线程加锁");
    34.                 System.out.println("第二个线程唤醒第一个线程");
    35.                 condition.signal();
    36.                 lock.unlock();
    37.                 System.out.println("第二个线程释放锁");
    38.             };
    40.         }.start();
    41.     }
    42. }

    结果
    image.png