线程学习笔记【2】---Timer(定时器)
入门
public class Time01 {public static void main(String[] args) {// Timer timer01=new Timer();// timer01.schedule(new TimerTask(){//// @Override// public void run() {//// System.out.println("bombing");// }}, 1000);new Timer().schedule(new TimerTask() { @Overridepublic void run() { System.out.println("bombing"); } }, 10000);while (true) { System.out.println(new Date().getSeconds());try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } }}运行结果
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bombing
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连续执行
public class Time02 {public static void main(String[] args) {new Timer().schedule(new TimerTask() { @Overridepublic void run() { System.out.println("bombing"); } }, 10000,3000); //每隔3秒执行 while (true) { System.out.println(new Date().getSeconds());try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } }}运行结果:
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bombing
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bombing
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bombing
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提高
?匿名内部类是临时的
?整数分为奇数和偶数,所以可以按照奇偶操作完成
/** *一个2秒执行,另一个4秒执行,交替循环往复 **/public class Time03 {static int i = 0; // 静态变量可以记录类创建的对象数量public static void main(String[] args) {class MyTimerTask extends TimerTask {//内部类内部不能生成静态变量 public void run() { i=(i+1)%2; System.out.println("bombing");new Timer().schedule(new MyTimerTask(), 2000+2000*i); } }new Timer().schedule(new MyTimerTask(), 2000);while (true) {try { System.out.println(new Date().getSeconds()); Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } }}?运行结果:
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bombing
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bombing
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bombing
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bombing
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/** * 每天在指定的时间执行操作 * 提供调度需求的开源框架Quartz在这方面处理能力很强*/public class Timer04 {public static void main(String[] args) { String str = "2011-08-28 08:39:00"; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Timer timer = new Timer();try { timer.schedule(new TimerTask() { @Overridepublic void run() { System.out.println("timer"); } }, sdf.parse(str), 24 * 60 * 1000); } catch (ParseException e) { e.printStackTrace(); }while (true) { System.out.println(new Date().getSeconds());try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } }/** * 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 * 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 timer 0 1 2 3 4 5*/}?
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