Schedule a task after a specific interval in Java

Question

I've got a class

class A {
     int a=0;
     public int getVal() {
         return a;
     }
}

and I've to execute the function getVal periodically. How do I do it from another class b? Thanks.

Answer 1

Old Way

java.util.Timer

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New (and preferred) Way

java.util.concurrent.Executors

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Implementation

More specifically, use the ScheduledExecutorService class.

Answer 2

Various potential problems with java.util.Timer are listed in section 6.2.5 of "Java Concurrency in Practice." For example:

• Timer behaves poorly if a TimerTask takes too long to run.
• Timer behaves poorly if a TimerTask throws an unchecked exception.

The authors of that book concluded that "there is little reason to use Timer in Java 5.0 or later."

Instead, they recommend using a ScheduledExecutorService . You can construct one either via the ScheduledThreadPoolExecutor constructor or via the newScheduledThreadPool factory methods in Executors . The later option is better.

Answer 3

Check out the Timer class.

http://download.oracle.com/javase/1.4.2/docs/api/java/util/Timer.html

Answer 4

Simply just give a look on Threads in java. you can make this class runnable, and execute the function periodically, and the delay can be generated using the sleep() function. Otherwise you can make the calling function runnable.