Multithreading_How to write several timers-javaTutorial-php.cn

1: Execute the task once after a fixed time: execute the task after 1000 milliseconds (execute only once)

2: Execute the task after 5000 milliseconds, and then execute the task again every 1000 milliseconds (infinite execution)

3: Alternate regeneration : The task is executed alternately in 2 seconds and 4 seconds (infinite execution),

4: Create two cyclic alternating tasks: after 2 seconds, task A is executed. A task B is created in task A and executed 4 seconds later, and a task A is created in task B and executed 2 seconds later, and so on.

1,2,3 codes:

import java.util.Date; import java.util.Timer; import java.util.TimerTask; /** * @author Administrator @zsw 2012-7-19 下午04:37:19 */ public class TraditionalTimer { public static void main(String[] args) { //1: // test1(); //2: // test2(); //3: test3(); //用于打印时间秒数 while (true) { System.out.println(new Date().getSeconds()); try { Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } //1:固定时间后执行一次任务：1000毫秒后执行任务(只执行一次) public static void test1() { new Timer().schedule(new TimerTask() { @Override public void run() { // TODO Auto-generated method stub System.out.println("bombing!"); } }, 1000); } // 2:5000毫秒后，执行任务，以后每隔1000毫秒再执行一次任务(无限执行) public static void test2() { new Timer().schedule(new TimerTask() { @Override public void run() { // TODO Auto-generated method stub System.out.println("bombing!"); } }, 5000, 1000); } //3:交替再生：任务2秒4秒交替的执行(无限执行)， static int count = 0; public static void test3() { class MyTimerTask extends TimerTask { @Override public void run() { count = (count + 1) % 2; System.out.println("bombing!"); new Timer().schedule(new MyTimerTask(), 2000 + count * 2000); } } new Timer().schedule(new MyTimerTask(), 2000); } }

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4 codes

import java.util.Date; import java.util.Timer; import java.util.TimerTask; /** * @author Administrator @zsw 2012-7-20 下午08:08:42 */ public class TraditionalTime2 { /* * 创建两个循环交替任务：2秒后，A任务执行。 * A任务里面创建一个B任务4秒后执行，B任务里面又创建一个A任务2秒后执行，，如此往复。 * */ public static void main(String[] args) { TraditionalTime2 t2=new TraditionalTime2(); new Timer().schedule(t2.new A(), 2000); //用于打印时间秒数 while (true) { System.out.println(new Date().getSeconds()); try { Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } class A extends TimerTask { @Override public void run() { System.out.println("A bombing!"); new Timer().schedule(new B(), 4000); } } class B extends TimerTask { @Override public void run() { System.out.println("B bombing!"); new Timer().schedule(new A(), 2000); } } }

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