1、指定延遲時間+迴圈執行操作

public class TimerTest {
	String path = "C:\\Users\\Administrator\\Desktop\\";
	Timer timer;
	public TimerTest(int time){
		timer = new Timer();
		timer.schedule(new timeTaskTest() , time*1000, 2000);//timer.schedule(執行的方法，延遲多久執行(ms))
	}
	
	class timeTaskTest extends TimerTask{
		@Override
		public void run() {
			File dir = new File(path);
			File[] files = dir.listFiles();
			if (files != null) {
				for (File file : files) {
					if (!file.isDirectory()) {
						String fileName = file.getName();
						if (fileName.equals("false.txt")) {
							System.out.println("檔名：" + fileName + "，還存在！！！");
						}else if (fileName.equals("true.txt")) {
							System.out.println("檔案false.txt被修改！！！");
							timer.cancel();
							System.out.println("取消定時任務！！！");
						}
					}
				}
			}	
		}
	}
	
	public static void main(String[] args) {
		System.out.println("timer begin...");
		new TimerTest(3);
	}
}
 

2、指定時間執行操作

public class TimerTest1 {
	Timer timer;

	public TimerTest1() {
		Date date = getTime();
		System.out.println("指定時間：" + date);
		timer = new Timer();
		timer.schedule(new TimerTaskTest2(), date);// timer.schedule(執行的方法，要執行的時間)
	}

	public Date getTime() {
		Calendar calendar = Calendar.getInstance();
		calendar.set(Calendar.HOUR, 11);
		calendar.set(Calendar.MINUTE, 33);
		calendar.set(Calendar.SECOND, 00);
		Date date = calendar.getTime();
		return date;
	}

	class TimerTaskTest2 extends TimerTask {

		@Override
		public void run() {
			// TODO Auto-generated method stub
			System.out.println("指定時間執行執行緒任務...");
		}
	}

	public static void main(String[] args) {
		new TimerTest1();
	}

}