//在當(dāng)前時間往后delay個毫秒開始執(zhí)行
public void schedule(TimerTask task, long delay) {...}
//在指定的time時間點(diǎn)執(zhí)行
public void schedule(TimerTask task, Date time) {...}

public static void main(String[] args) {
    //定義一個Timer
    Timer timer = new Timer("test-timer");
    //定義一個TimerTask
    TimerTask task = new TimerTask() {
        @Override
        public void run() {
            System.out.println("任務(wù)執(zhí)行時間：" + new Date() + "------------"
                               + "線程：" + Thread.currentThread().getName());
        }
    };
    long delay = 3000L;
    timer.schedule(task, delay);
    System.out.println("任務(wù)添加時間：" + new Date() + "------------"
                       + "線程：" + Thread.currentThread().getName());
}

public class Timer {
    //小頂堆，用來存放timeTask
    private final TaskQueue queue = new TaskQueue();
    
    private final TimerThread thread = new TimerThread(queue);
    
    public Timer(String name) {
        thread.setName(name);
        thread.start();
    }
}
public abstract class TimerTask implements Runnable {
    long nextExecutionTime;
    long period = 0;
    public abstract void run();
}

//從當(dāng)前時間開始delay個毫秒數(shù)開始定期執(zhí)行，周期是period個毫秒數(shù)
public void schedule(TimerTask task, long delay, long period) {...}
////從指定的firstTime開始定期執(zhí)行，往后每次執(zhí)行的周期是period個毫秒數(shù)
public void schedule(TimerTask task, Date firstTime, long period){...}