concurrency: notify vs signal

//---------------------------------
Object lock = new Object();
//Thread A:
synchronized(lock) {
 lock.notifyAll();
 runBeforeThreadBisNotified();
}
//-----
//Thread B:
synchronized(lock) {
 lock.wait();
 runOnNotificationFromThreadA();
}
//---------------------------------

 final Lock lock = new ReentrantLock();
 final Condition cond = lock.newCondition();
//Thread A:
 lock.lock();
 try {
  cond.signal();
  runWhenThreadBisFinished() ;
 } finally {
 lock.unlock();
 }
//-----
//Thread B:
 lock.lock();
 try {
  cond.await();
  runWhenSignaled() ;
 } finally {
 lock.unlock();
 }
//---------------------------------