16 线程优先级

package ThreadDemo;

// 线程优先级 1--10  // 默认优先级5
 // 优先级高不代表一定先执行，概率变高而已
public class Test16_Priority {
    public static void main(String[] args) {
        System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority()); // 主线程的优先级

        // 子线程
        Thread t1 = new Thread(new PriorityDemo(), "t1");
        Thread t2 = new Thread(new PriorityDemo(), "t2");
        Thread t3 = new Thread(new PriorityDemo(), "t3");
        Thread t4 = new Thread(new PriorityDemo(), "t4");

        // 先设置优先级，再启动线程
        t1.setPriority(1);
        t1.start();
        t2.setPriority(5);
        t2.start();
        t3.setPriority(Thread.MAX_PRIORITY);  // 10
        t3.start();
        t4.setPriority(11); // 出错
        t4.start();


    }
}

class PriorityDemo implements Runnable{
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority());
    }  // 打印优先级
}