2. public class ABCPrint extends Thread {
    3.     private final String str[] = {"A", "B", "C"};
    4.     private final static AtomicInteger atomCount = new AtomicInteger();
    6.     public ABCPrint(String name) {
    7.         this.setName(name);
    8.     }
    9.     @Override
    10.     public void run() {
    11.         while (true) {
    12.             // 循环满2轮退出打印
    13.             if (atomCount.get() / 3 == 2) {
    14.                 break;
    15.             }
    16.             synchronized (atomCount) {
    17.                 // 顺序打印A、B、C
    18.                 if (str[atomCount.get() % 3].equals(getName())) {
    19.                     atomCount.getAndIncrement();//自增
    20.                     System.out.println(getName());
    21.                     //表示一轮打印结束 方便观察打印下分隔符
    22.                     if ("C".equals(getName())) {
    23.                         System.out.println("================================");
    24.                     }
    25.                     // 当前线程打印打印完成后唤醒其它线程
    26.                     atomCount.notifyAll();
    27.                 } else {
    28.                     // 非顺序线程wait()
    29.                     try {
    30.                         atomCount.wait();
    31.                     } catch (InterruptedException e) {
    32.                         e.printStackTrace();
    33.                     }
    34.                 }
    35.             }
    36.         }
    37.     }
    38. }
    41.     public static void main(String[] args) {
    42.         new ABCPrint("A").start();
    43.         new ABCPrint("B").start();
    44.         new ABCPrint("C").start();
    46.     }