public class test30 {public static void main(String[] args){Thread xc11=new Thread(new Xc41());Thread xc12=new Thread(new Xc42());xc11.setPriority(Thread.NORM_PRIORITY+3);//数字越大，优先级越高，默认为5xc11.start();xc12.start();}
}
class Xc41 extends Thread {public void run(){for (int i=0;i<20;i++){System.out.println("第一个线程在被执行"+i);}}
}
class Xc42 extends Thread {public void run(){for (int i=0;i<20;i++){System.out.println("i线程"+i);}}
}

运行结果