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Tip of the Day
Language: Java
Expertise: Beginner
Feb 20, 2002

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


How to Schedule a Task


Here are three alternatives to scheduling a task run repeatedly without using threads:

1.Using loop construct:
  
boolean temp=true;
 While (temp) {
  for (int i = 0; i < 999999999; i++) {
	 i=i;
     }
 //  our code
}

2. Using Timer and TimerTask classes (java.util.*):
 
 int initTime = 10000; // start after 10 seconds
 int Time = 5000;      // repeat every 5 seconds
 Timer timer = new Timer();
 TimerTask task = new TimerTask() {
   public void run() {
     //  our code
   }
 };
timer.scheduleAtFixedRate(task, initTime, Time);

3. Using The Timer class (java.swing.*):
 
  int Time = 5000; // repeat every 5 seconds
  Timer timer = new Timer(Time, new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
             //  our code
            }
  });
  timer.start();

Swing and utility timer classes provide the same functionality. The main difference between the two classes is that each java.util.Timer object creates one thread. Swing Timer class uses a single private thread to schedule ALL timers. The first variant creates a delay by keeping the CPU busy.
Sergejs Svitnevs
 
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