java Task Scheduling Timing (Timer)

Timing task scheduling

By Timer and Timetask, we can achieve timing to start a thread.

java.util.Timer

      In this implementation, the Timer class action is an alarm clock function, i.e. the timing or trigger a thread at predetermined time intervals. In fact, Timer class itself is to achieve a thread, but that thread is used to implement calls to other threads.

java.util.TimerTask

      TimerTask class is an abstract class that implements the Runnable interface, multi-threading capabilities class has.

In this implementation, the class through inheritance TimerTask ability to obtain multi-threaded, multi-threaded code will be required to perform writing within the run method and then by performing the Timer class start threads.

java.util.Timer use

public  class TestTimer {
     public  static  void main (String [] args) { 
        the Timer T1 = new new the Timer (); // custom timer; 
        to MyTask Task1 = new new to MyTask (); // define the task; 
        t1.schedule (task1,3000) ;   // performed for 3 seconds;
         // t1.schedule (task1,5000,1000); // after 5 seconds executed once every second!
        // the GregorianCalendar Calendar1 the GregorianCalendar new new = (2010,0,5,14,36,57); 
         // t1.schedule (Task1, calendar1.getTime ()); // the specified execution timing of time; 
    } 
} 
 
classTo MyTask the extends TimerTask { // custom thread class inherits class TimerTask; 
    public  void RUN () {
         for ( int I = 0; I <10; I ++ ) { 
            System.out.println ( "Task. 1:" + I); 
        } 
    } 
}

The results shown in Figure:

 

 

When you run the above program, you can feel there is a significant delay (probably three seconds!) Before output. There are a few ways to try it myself!

In actual use, a Timer can be activated any number of threads TimerTask achieved, but there will be blocked between multiple threads. So if you need a completely separate words among multiple threads, it is best to start a TimerTask achieve a Timer.

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@Scheduled comment

https://www.jianshu.com/p/1defb0f22ed1

Springboot integrated asynchronous regular tasks

https://blog.csdn.net/qq_32447301/article/details/84668865

spring boot comes with regular tasks, time expressions representing some of the pit a few weeks. .

https://blog.csdn.net/z1040141848/article/details/96973459

springboot integrated quartz achieve dynamic regular tasks

The actual development, we can use open-source framework quanz, more convenient scheduling the timing of the realization of the task. In fact, the content quanz underlying principle is presented here.

https://blog.csdn.net/z291197968/article/details/82351471