Java线程:线程的调度-优先级
 
与线程休眠类似,线程的优先级仍然无法保障线程的执行次序。只不过,优先级高的线程获取CPU资源的概率较大,优先级低的并非没机会执行。
 
线程的优先级用1-10之间的整数表示,数值越大优先级越高,默认的优先级为5。
 
在一个线程中开启另外一个新线程,则新开线程称为该线程的子线程,子线程初始优先级与父线程相同。
 
/**
* Java线程:线程的调度-优先级
*
* @author leizhimin 2009-11-4 9:02:40
*/

public class Test {
        public static void main(String[] args) {
                Thread t1 = new MyThread1();
                Thread t2 = new Thread(new MyRunnable());
                t1.setPriority(10);
                t2.setPriority(1);

                t2.start();
                t1.start();
        }
}

class MyThread1 extends Thread {
        public void run() {
                for (int i = 0; i < 10; i++) {
                        System.out.println("线程1第" + i + "次执行!");
                        try {
                                Thread.sleep(100);
                        } catch (InterruptedException e) {
                                e.printStackTrace();
                        }
                }
        }
}

class MyRunnable implements Runnable {
        public void run() {
                for (int i = 0; i < 10; i++) {
                        System.out.println("线程2第" + i + "次执行!");
                        try {
                                Thread.sleep(100);
                        } catch (InterruptedException e) {
                                e.printStackTrace();
                        }
                }
        }
}
 
线程1第0次执行!
线程2第0次执行!
线程2第1次执行!
线程1第1次执行!
线程2第2次执行!
线程1第2次执行!
线程1第3次执行!
线程2第3次执行!
线程2第4次执行!
线程1第4次执行!
线程1第5次执行!
线程2第5次执行!
线程1第6次执行!
线程2第6次执行!
线程1第7次执行!
线程2第7次执行!
线程1第8次执行!
线程2第8次执行!
线程1第9次执行!
线程2第9次执行!

Process finished with exit code 0