java Runtime类 Time类

Runtime类
* Runtime类是一个单例类
*
Runtime r = Runtime.getRuntime();
//r.exec("shutdown -s -t 300"); //300秒后关机
r.exec("shutdown -a"); //取消关机

 

Timer
* Timer类:计时器

public class Demo5_Timer {
/**
* @param args
* 计时器
* @throws InterruptedException
*/
public static void main(String[] args) throws InterruptedException {
Timer t = new Timer();
t.schedule(new MyTimerTask(), new Date(114,9,15,10,54,20),3000);

while(true) {
System.out.println(new Date());
Thread.sleep(1000);
}
}
}
class MyTimerTask extends TimerTask {
@Override
public void run() {
System.out.println("起床背英语单词");
}

}