Java定时器

• 构造方法

  public Timer()：构造一个定时器

• 成员方法

  public void schedule(TimerTask task,Date time);
  public void schedule(TimerTask task,long millis);
  public void schedule(TimerTask task,Date time,long period);
  public void schedule(TimerTask task,long millis,long period);

• 案例演示

　　

public class TestTimerDemo {
    public static void main(String[] args) {
        //1.创建定时器
        Timer timer = new Timer();
        //2.布置任务
        //一次性定时器
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                System.out.println("时间到了下课...");
            }
        },5000);

        Calendar cc = Calendar.getInstance();
        cc.add(Calendar.SECOND,5);
        Date time = cc.getTime();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                System.out.println("时间到了下课...");
            }
        },time);

        //周期定时器
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                System.out.println("时间到了下课...");
            }
        },5000,2000);

        Calendar cc1 = Calendar.getInstance();
        cc1.add(Calendar.SECOND,5);
        Date time1 = cc1.getTime();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                System.out.println("时间到了下课...");
            }
        },time1,1000);
    }
}