三个线程循环打印abc

为了实现三个线程循环打印ABC，可以使用Synchronized同步方法和Object的wait()和notify()方法。首先，创建三个线程A、B、C，并设置它们的打印次数为10。然后，通过使用三个对象锁a、b、c来控制线程的执行顺序。A线程首先获得c对象锁，打印A后释放c对象锁，并通过notify()方法唤醒B线程。B线程等待a对象锁，获取到a对象锁后打印B，并释放a对象锁，然后通过notify()方法唤醒C线程。C线程等待b对象锁，获取到b对象锁后打印C，并释放b对象锁，并通过notify()方法唤醒A线程。这样就实现了三个线程循环打印ABC的需求。

以下是一个示例代码：

class PrintThread implements Runnable {
    private static final Object a = new Object();
    private static final Object b = new Object();
    private static final Object c = new Object();
    private String name;
    
    public PrintThread(String name) {
        this.name = name;
    }
    
    @Override
    public void run() {
        for (int i = 0; i < 10; i++) {
            synchronized (name) {
                try {
                    switch (name) {
                        case "A":
                            synchronized (c) {
                                System.out.print("A");
                                c.notify();
                            }
                            name.wait();
                            break;
                        case "B":
                            synchronized (a) {
                                System.out.print("B");
                                a.notify();
                            }
                            name.wait();
                            break;
                        case "C":
                            synchronized (b) {
                                System.out.print("C");
                                b.notify();
                            }
                            name.wait();
                            break;
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Thread threadA = new Thread(new PrintThread("A"));
        Thread threadB = new Thread(new PrintThread("B"));
        Thread threadC = new Thread(new PrintThread("C"));
        
        threadA.start();
        threadB.start();
        threadC.start();
    }
}

通过以上代码，三个线程将按照ABCABCABC的顺序循环打印10次。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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