Java定时器通信协议管理模块Timer详解

//在当前时间往后delay个毫秒开始执行
public void schedule(TimerTask task, long delay) {...}
//在指定的time时间点执行
public void schedule(TimerTask task, Date time) {...}

public static void main(String[] args) {
    //定义一个Timer
    Timer timer = new Timer("test-timer");
    //定义一个TimerTask
    TimerTask task = new TimerTask() {
        @Override
        public void run() {
            System.out.println("任务执行时间：" + new Date() + "------------"
                               + "线程：" + Thread.currentThread().getName());
        }
    };
    long delay = 3000L;
    timer.schedule(task, delay);
    System.out.println("任务添加时间：" + new Date() + "------------"
                       + "线程：" + Thread.currentThread().getName());
}

public class Timer {
    //小顶堆，用来存放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();
}

//从当前时间开始delay个毫秒数开始定期执行，周期是period个毫秒数
public void schedule(TimerTask task, long delay, long period) {...}
////从指定的firstTime开始定期执行，往后每次执行的周期是period个毫秒数
public void schedule(TimerTask task, Date firstTime, long period){...}