Binding lock multiple conditions

Calls between multiple threads in order to achieve A → B → C three thread starts, the following:

2 AA printing, BB printed three times, four times the CC printing, printing two successive order.

class ShareResource {
    private int number = 1;
    private Lock lock = new ReentrantLock();
    private Condition c1 = lock.newCondition();
    private Condition c2 = lock.newCondition();
    private Condition c3 = lock.newCondition();

    public void print2() {
        lock.lock();
        try {
            while (number != 1) {
                c1.await();
            }
            for(int i = 1; i <= 2; i++) {
                System.out.println(Thread.currentThread().getName()+"\t" + i);
            }
            number = 2;
            c2.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void print3() {
        lock.lock();
        try {
            while (number != 2) {
                c2.await();
            }
            for(int i = 1; i <= 3; i++) {
                System.out.println(Thread.currentThread().getName()+"\t" + i);
            }
            number = 3;
            c3.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void print4() {
        lock.lock();
        try {
            while (number != 3) {
                c3.await();
            }
            for(int i = 1; i <= 4; i++) {
                System.out.println(Thread.currentThread().getName()+"\t" + i);
            }
            number = 1;
            c1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}

public class SyncAndReentrantLockDemo {
    public static void main(String[ ]args) {
        ShareResource shareResource = new ShareResource();
        new Thread(() ->{
            for(int i = 1; i <= 2;i++ ) {
                shareResource.print2();
            }
        },"AA").start();
        new Thread(() ->{
            for(int i = 1; i <= 2;i++ ) {
                shareResource.print3();
            }
        },"BB").start();
        new Thread(() ->{
            for(int i = 1; i <= 2;i++ ) {
                shareResource.print4();
            }
        },"CC").start();

        }
}
运行结果见下图：