使用 5 个多线程打印数字

Question

我想使用多线程打印一个数字列表

    class RunnableWorker implements Runnable{
    @Override
    public void run() {
        for (int i = 0; i <= 30000; i++) {
            System.out.println(Thread.currentThread().getName() + ": " + i);
        }
    }
    
}
public class RunnableFunctionalInterfaceDemo {
    public static void main(String[] args) {
        Runnable r3 = new RunnableWorker();     
        Thread t3 = new Thread(r3);
        t3.start();
    }
}

线程 1 线程 2 ...... 1 2

Answer 1

不确定你的问题是什么，但你只需要创建更多线程，如果这是你想要的。

 Runnable r3 = new RunnableWorker();
    Thread t0 = new Thread(r3);
    Thread t1 = new Thread(r3);
    Thread t2 = new Thread(r3);
    Thread t3 = new Thread(r3);
    Thread t4 = new Thread(r3);
    t0.start();
    t1.start();
    t2.start();
    t3.start();
    t4.start();

然而，这将为每个线程调用一个新的方法实例。

查看执行器池

class WorkerThread implements Runnable {
private String message;
public WorkerThread(String s){
    this.message=s;
}
public void run() {
    System.out.println(Thread.currentThread().getName()+" || Counter: "+message);
}

}

  import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;

    public class RunnableFunctionalInterfaceDemo {
    public static void main(String[] args) {
        ExecutorService executor = Executors.newFixedThreadPool(4);//creating a pool of 4 threads
        for (int i = 0; i < 1000; i++) {
            Runnable worker = new WorkerThread("" + i);
          executor.execute(worker);//calling execute method of ExecutorService
        }
        executor.shutdown();
    }
}