Job Scheduling in Java using Timer API

import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

public class ReportGenerator extends TimerTask {

  public void run() {
    System.out.println("Generating report");
    //TODO generate report
  }

}

class MainApplication {

  public static void main(String[] args) {
    Timer timer  new Timer();
    Calendar date = Calendar.getInstance();
    date.set(
      Calendar.DAY_OF_WEEK,
      Calendar.SUNDAY
    );
    date.set(Calendar.HOUR, 0);
    date.set(Calendar.MINUTE, 0);
    date.set(Calendar.SECOND, 0);
    date.set(Calendar.MILLISECOND, 0);
    // Schedule to run every Sunday in midnight
    timer.schedule(
      new ReportGenerator(),
      date.getTime(),
      1000 * 60 * 60 * 24 * 7
    );
  }
}

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Demonstrate Timer and TimerTask

Here is a Java Program to Demonstrate Timer and TimerTask.

import java.util.*;

class MyTimerTask extends TimerTask {
  public void run() {
    System.out.println("Timer task executed.");
  }
}

class TTest {
  public static void main(String args[]) {
    MyTimerTask myTask = new MyTimerTask();
    Timer myTimer = new Timer();

    /* Set an initial delay of 1 second,
       then repeat every half second.
    */
    myTimer.schedule(myTask, 1000, 500);
    
    try {
      Thread.sleep(5000);
    } catch (InterruptedException exc) {}

    myTimer.cancel();
  }
}

Output of Above Java Program
Timer task executed.
Timer task executed.
Timer task executed.
Timer task executed.
Timer task executed.
Timer task executed.
Timer task executed.
Timer task executed.
Timer task executed.

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