java - 如何用四线打印 1 到 10

Question

如何使用 4 个线程打印 1 到 10，并且当打印数字 10 时，线程通知所有其他线程终止。我想要这样的输出

t1 -1
 t2 -2
 t3 -3
 t4 -4
 t1 -5
 t2 -6
 t3 -7
 t4 -8 
 t1-9       
 t2 -10
 all thread stop

我尝试过这个，但我知道这不是正确的方法，谁能告诉我正确的方法，我在互联网上找不到任何正确的答案，如果有人告诉我正确的方法，那将是一个很大的帮助

public class NumberGame {
    public static void main(String[] args) {

        PrintSequenceRunnable.startFrom("T1");

        new Thread(new PrintSequenceRunnable("T1", "T2")).start();
        new Thread(new PrintSequenceRunnable("T2", "T3")).start();
        new Thread(new PrintSequenceRunnable("T3", "T1")).start();
    }
}

class PrintSequenceRunnable implements Runnable {

    private final String name;
    private final String next;

    private static String moveTo;

    private static int value = 1;

    PrintSequenceRunnable(String name, String next) {
        this.name = name;
        this.next = next;
    }

    static void startFrom(String start) {
        moveTo = start;
    }



    @Override
    public void run() {
        do {
            synchronized (moveTo) {
                if (name.equals(moveTo)) {
                    System.out.println(name + "-" + (value++));
                    moveTo = next;
                } else {
                    uselessCounter++;
                }
            }
        } while (value < 10);

    }

}

Answer 1

首先，如果您使用并发搜索线程安全变量、对象等。永远不要使用这样的东西 private static int value = 1; 使用原子变量，例如 private static AtomicInteger value = new AtomicInteger(0); 做好你的工作，直到达到你的目标任务完成。如果作业完成，则中断线程。我有这段代码

类 PrintSequenceRunnable 实现 Runnable {

private final String name;
private final String next;

private static String moveTo;

private static AtomicInteger value = new AtomicInteger(0);

PrintSequenceRunnable(String name, String next) {
    this.name = name;
    this.next = next;
}

static void startFrom(String start) {
    moveTo = start;
}



@Override
public void run() {
    do {
            if (name.equals(moveTo) && value.get() < 10) {
                System.out.println(name + "-" + (value.incrementAndGet()));
                moveTo = next;
            }
    } while (value.get() < 10);
}

}

public static void main (String[] args) {
    PrintSequenceRunnable.startFrom("T1");

    new Thread(new PrintSequenceRunnable("T1", "T2")).start();
    new Thread(new PrintSequenceRunnable("T2" , "T3")).start();
    new Thread(new PrintSequenceRunnable("T3", "T4")).start();
    new Thread(new PrintSequenceRunnable("T4", "T1")).start();
}

输出:

T1-1
T2-2
T3-3
T4-4
T1-5
T2-6
T3-7
T4-8
T1-9
T2-10