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使用重入锁 ReentrantLock先来获得,.newCondition对象，Condition 可以用来指定队列，唤醒指定队列中的线程，这样在多线程环境下会有更高的效率；

package morning;import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;//4.三个线程交替输出A B C ，输出20遍。public class Lock_Condition_ABC {    private static Lock lock = new ReentrantLock();    private static Condition A = lock.newCondition();    private static Condition B = lock.newCondition();    private static Condition C = lock.newCondition();    private static int count = 0;    private  static int sum=1;    static class ThreadA extends Thread {        @Override        public void run() {            try {                lock.lock();                for (int i = 0; i < 10; i++) {                    while (count % 3 != 0){//注意这里是不等于0，也就是说没轮到该线程执行，之前一直等待状态                        A.await(); //该线程A将会释放lock锁，构造成节点加入等待队列并进入等待状态                    }                    System.out.println("-------第"+sum+"次--------");                    System.out.println("A");                    count++;                    B.signal(); // A执行完唤醒B线程                }            } catch (InterruptedException e) {                e.printStackTrace();            } finally {                lock.unlock();            }        }    }    static class ThreadB extends Thread {        @Override        public void run() {            try {                lock.lock();                for (int i = 0; i < 10; i++) {                    while (count % 3 != 1)                        B.await();// B释放lock锁，当前面A线程执行后会通过B.signal()唤醒该线程                    System.out.println("B");                    count++;                    C.signal();// B执行完唤醒C线程                }            } catch (InterruptedException e) {                e.printStackTrace();            } finally {                lock.unlock();            }        }    }    static class ThreadC extends Thread {        @Override        public void run() {            try {                lock.lock();                for (int i = 0; i < 10; i++) {                    while (count % 3 != 2)                        C.await();// C释放lock锁                    System.out.println("C");                    count++;                    sum++;                    A.signal();// C执行完唤醒A线程                }            } catch (InterruptedException e) {                e.printStackTrace();            } finally {                lock.unlock();            }        }    }    public static void main(String[] args) throws InterruptedException {        new ThreadA().start();        new ThreadB().start();        new ThreadC().start();    }}

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