请问下这个做用是什么？Condition用来干嘛的？

Question

private Lock lock = new ReentrantLock();
private Condition threadCond = lock.newCondition();

Answer 1

1、在某些情况下，当内部锁非常不灵活时，显式锁就可以派上用场。内部条件队列有一些缺陷，每个内部锁只能有一个与之相关联的条件队列。2、使用显式的Lock和Condition的实现类提供了一个比内部锁和条件队列更加灵活的选择。一个Condition和一个单独的Lock相关联，就像条件队列和单独的内部锁相关联一样。每个锁可以有多个等待集、中断性选择、基于时限、公平性选择等。public interface Condition{void await() throws InterruptedException;//相当于waitboolean await(long time,TimeUnit unit) throws InterruptedException;long awaitNanos(long nanosTimeout) throws InterruptedException;void awaitUninterruptibly();boolean awaitUntil(Date deadline) throws InterruptedException;void signal();//相当于notifyvoid signalAll();//相当于notifyall}调用与Condition相关联的Lock的Lock.newCondition方法，可创建一个Condition.3、有限缓存操作@ThreadSafepublic class ConditionBoundedBuffer<T>{protected final Lock lock=new ReentrantLock();private final Condition notFull=lock.newCondition();private final Condition notEmpty=lock.newCondition();@GuardBy("lock");private final T[] items=(T[]) new Object[BUFFER_SIZE];@GuardBy("lock") private int tail,head,count;public void put(T x) throws InterruptedExceptoin{lock.lock();try{while (count=items.lentgh)notFull.await();items[tail]=x;if (++tail=items.length)tail=0;++count;notEmpty.signal();}finally{lock.unlock();}}public T take() throws InterruptedException{lock.lock();try{while (count=items.lentgh)notEmpty.await();T x=items[head];items[head]=null;if (++head=items.length)head=0;--count;notFull.signal();return x;}finally{lock.unlock();}}}&nbsp;