编写一个Java程序（包括一个主程序类，一个Thread类的子类）。在主程序中创建2个线程（用子类） ，将其中一个线程的优先级设为10，另一个线程的优先级设为6。

主程序类：

public class Main {

    public static void main(String[] args) {
        MyThread thread1 = new MyThread("Thread 1");
        MyThread thread2 = new MyThread("Thread 2");

        thread1.setPriority(10);
        thread2.setPriority(6);

        thread1.start();
        thread2.start();
    }
}

Thread类的子类：

public class MyThread extends Thread {

    public MyThread(String name) {
        super(name);
    }

    public void run() {
        for (int i = 1; i <= 10; i++) {
            System.out.println(getName() + ": " + i);
            try {
                sleep(500);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

输出：

Thread 1: 1
Thread 2: 1
Thread 1: 2
Thread 2: 2
Thread 1: 3
Thread 2: 3
Thread 1: 4
Thread 2: 4
Thread 1: 5
Thread 2: 5
Thread 1: 6
Thread 2: 6
Thread 1: 7
Thread 2: 7
Thread 1: 8
Thread 2: 8
Thread 1: 9
Thread 2: 9
Thread 1: 10
Thread 2: 10