定时处理任务(Timer)

Timer类，是一种工具，可安排任务执行一次或者定期重复重复执行

public class OneTime {public static void main(String[] args) {Timer timer = new Timer();TimerTask task = new MyTimerTask();Date date = new Date(System.currentTimeMillis() + 3000);//过三秒之后执行任务timer.schedule(task, date);}}public class MyTimerTask extends TimerTask{@Overridepublic void run() {System.out.println("MyTimerTask");}}

public class RepeatDo { public static void main(String[] args) { Timer timer=new Timer(); //创建一个计时器过两秒后每隔3S 执行一次操作 timer.schedule(new MyTimerTask1(1,timer), 2000, 1L*3000); } } public class MyTimerTask1 extends TimerTask{int round_id;Timer timer;public MyTimerTask1(int round,Timer timer) {this.round_id = round;this.timer = timer;}@Overridepublic void run() {this.round_id++;System.out.println("repeat : " + this.round_id);//如果重复了4次之后就取消定时器if(this.round_id == 5){timer.cancel();}}}

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