多个线程顺序打印不同字符abcdefg(利用线程池实现多线程)

/**
 * @author: rhyme
 * @date: 2019-08-17 14:39
 * @topic: "Runnable"
 * @description: "每个线程通过sign表示需要打印的字符数组下标，index表示将要打印的字符数组的下标"
 */
public class PrintRunnable implements Runnable {

    private final char[] chars;
    /**
     * 当前线程只能打印的那个字符对应数组的下标
     */
    private final int sign;
    /**
     * 当前将要打印的字符数组下标
     */
    private volatile static int index;

    public PrintRunnable(String chars, int sign) {
        this.chars = chars.toCharArray();
        this.sign = sign;
    }

    @Override
    public void run() {
        while (true) {
            // 为了结合线程池shutdownNow方法设置中断interrupt停止线程
            if (Thread.currentThread().isInterrupted()) {
                break;
            }

            synchronized (PrintRunnable.class) {
                if (index % chars.length == sign) {
                    System.out.printf("ThreadName : %s is printing (%c)\n", Thread.currentThread().getName(), chars[sign]);
                    index++;
                }
            }
        }
    }
}

import com.google.common.util.concurrent.ThreadFactoryBuilder;

import java.util.concurrent.*;

/**
 * @author: rhyme
 * @date: 2019-08-17 14:37
 * @topic: "多个线程打印"
 * @description: "多个线程有序打印abcdefg"
 */
public class MultiThreadPrintOrder {
    public static void main(String[] args) throws InterruptedException {
        String string = "abcdefg";

        ThreadFactory namedThreadFactory = new ThreadFactoryBuilder()
                .setNameFormat("order-pool-%d")
                .build();

        ExecutorService threadPoolExecutor =
                new ThreadPoolExecutor(
                        string.length(),
                        string.length(),
                        0L,
                        TimeUnit.SECONDS,
                        new ArrayBlockingQueue<>(1),
                        namedThreadFactory,
                        new ThreadPoolExecutor.AbortPolicy());

        for (int i = 0; i < string.length(); i++) {
            threadPoolExecutor.execute(new PrintRunnable(string, i));
        }

        // 3秒后线程池调用shutdownNow设置线程中的interrupt中断标志位
        TimeUnit.SECONDS.sleep(3);
        System.out.printf("ThreadName: (%s) Preparing call shutdownNow()...\n", Thread.currentThread().getName());
        threadPoolExecutor.shutdownNow();

    }
}