Timer

逃离我推掉我的手 2024-03-17 09:13 4阅读 0赞

public class MyTimer {
        
        private static int count = 1;
        private static List<String> userList = Arrays.asList("a", "b", "c", "d");
    
        /**
         * 每隔一段时间 发送一些数据
         */
        public static void main(String[] args) throws ParseException {
        
            System.out.println(Thread.currentThread().getName() + " → " + "预备开始" + new Date());
    
    
            Timer timer = new java.util.Timer();
            Date firstTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse("2023-05-21 13:25:00");
    
            timer.schedule(new TimerTask() {
        
                @Override
                public void run() {
        
                    System.out.println(Thread.currentThread().getName() + " → " + "第" + count++ + "次执开始行" + " Start Time = " + new Date());
    
                    for (int i = 0; i < userList.size(); i++) {
        
                        System.out.println(Thread.currentThread().getName() + "  给 " + userList.get(i) + " 发送一条消息: " + " 恭喜发财 " + new Date());
                    }
    
                    System.out.println(Thread.currentThread().getName() + " → " + "第" + count++ + "次执开始行" + " End   Time = " + new Date());
                }
            }, firstTime, 3000);
        }
    }

--------------------

### 执行结果分析 ###

<table> 
 <thead> 
  <tr> 
   <th align="left">执行结果</th> 
   <th>分析</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td align="left"><strong>前置条件：<code>2023-05-21 13:25:00</code>正式执行，周期<code>3</code>秒</strong></td> 
   <td></td> 
  </tr> 
  <tr> 
   <td align="left">main → 预备开始Sun May 21 13:24:38 CST 2023</td> 
   <td>启动程序</td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 → 第1次执开始行 Start Time = Sun May 21 13:25:00 CST 2023</td> 
   <td>第<code>1</code>次开始执行</td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 给 a 发送一条消息: 恭喜发财 Sun May 21 13:25:00 CST 2023</td> 
   <td></td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 给 b 发送一条消息: 恭喜发财 Sun May 21 13:25:00 CST 2023</td> 
   <td></td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 给 c 发送一条消息: 恭喜发财 Sun May 21 13:25:00 CST 2023</td> 
   <td></td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 给 d 发送一条消息: 恭喜发财 Sun May 21 13:25:00 CST 2023</td> 
   <td></td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 → 第2次执开始行 End Time = Sun May 21 13:25:00 CST 2023</td> 
   <td>第<code>1</code>次执行完毕</td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 → 第3次执开始行 Start Time = Sun May 21 13:25:03 CST 2023</td> 
   <td>第<code>2</code>次开始执行</td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 给 a 发送一条消息: 恭喜发财 Sun May 21 13:25:03 CST 2023</td> 
   <td></td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 给 b 发送一条消息: 恭喜发财 Sun May 21 13:25:03 CST 2023</td> 
   <td></td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 给 c 发送一条消息: 恭喜发财 Sun May 21 13:25:03 CST 2023</td> 
   <td></td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 给 d 发送一条消息: 恭喜发财 Sun May 21 13:25:03 CST 2023</td> 
   <td></td> 
  </tr> 
  <tr> 
   <td align="left">Timer-0 → 第4次执开始行 End Time = Sun May 21 13:25:03 CST 2023</td> 
   <td>第<code>2</code>次执行完毕</td> 
  </tr> 
 </tbody> 
</table>