实现Runnable接口 

另一种实现多线程的方式是实现Runnable接口，需要实现run()方法，并将实现了Runnable接口的对象传递给Thread类的构造函数。

public class RunnableDemo {
    public static void main(String[] args) {
        // 创建10个线程并启动
        for (int i = 0; i < 10; i++) {
            Runnable task = new MyTask(i);
            Thread thread = new Thread(task);
            thread.start();
        }
    }
}
 
class MyTask implements Runnable {
    private int id;
 
    public MyTask(int id) {
        this.id = id;
    }
 
    public void run() {
        System.out.println("Thread " + id + " is running");
        try {
            Thread.sleep(1000);  // 模拟任务执行时间
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}