多线程顺序输出

之前面试被坑过，填坑

public class PrintSorted {
    

    private static final List<MyLock> myLocks = new ArrayList<>();

    public static class MyLock {
    
        public String awakeThreadName = "";

        public MyLock(String awakeThreadName) {
    
            this.awakeThreadName = awakeThreadName;
        }
    }

    public static void main(String[] args) {
    
        print(10);
        synchronized (myLocks.get(0)) {
    
            myLocks.get(0).notifyAll();
        }
    }

    public static void print(int threadNum) {
    
        List<Thread> threads = new ArrayList<>(threadNum);

        for (int i = 0; i < threadNum; ++i) {
    
            MyLock myLock = new MyLock("thread-" + i);
            myLocks.add(myLock);
        }

        for (int i = 0; i < threadNum; ++i) {
    

            final int x = i;
            threads.add(new Thread() {
    
                @Override
                public void run() {
    
                    while (true) {
    
                        synchronized (myLocks.get(x)) {
    
                            try {
    
                                myLocks.get(x).wait();
                            } catch (InterruptedException e) {
    
                                e.printStackTrace();
                            }
                        }
                        System.out.println("Thread - " + x);
                        synchronized (myLocks.get((x + 1) % threadNum)) {
    
                            myLocks.get((x + 1) % threadNum).notifyAll();
                        }
                    }
                }
            });
        }

        for (int i = 0; i < threadNum; ++i) {
    
            threads.get(i).start();
        }
    }

}