java.util.Timer sample

Countdown을 설정하는 예제




Countdown.java 
import java.util.Timer;
import java.util.TimerTask;

public class Countdown {
    public static void main(final String args[]) {
        if (args.length != 1) {
            System.err.println("Usage: java Countdown <time in secs>");
            System.exit(1);
        }
        final Timer timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {
            int i = Integer.parseInt(args[0]);
            public void run() {
                System.out.println(i--);
                if (i< 0)
                    timer.cancel();
            }
        }, 0, 1000);
    }
}




C:\javaExample\util>javac Countdown.java
C:\javaExample\util>java Countdown 3
3
2
1
0

=========================================================

cancel()을 이용해 Timer 스레드 종료하기




TimerTest.java

import java.util.Timer;
import java.util.TimerTask;

public class TimerTest {
    Timer timer;
    public TimerTest(int seconds) {
        timer = new Timer();
        timer.schedule(new TimerTaskTest(), seconds*1000);
    }
    class TimerTaskTest extends TimerTask {
        public void run() {
            System.out.println("Time's up!");
            timer.cancel(); //timer thread 종료
        }
    }
    public static void main(String args[]) {
        System.out.println("About to schedule task.");
        new TimerTest(3);
        System.out.println("Task scheduled.");
    }
}




C:\javaExample\util>javac TimerTest.java
C:\javaExample\util>java TimerTest
About to schedule task.
Task scheduled.
Time's up!




프로그램을 실행시키면 3초 후에 자동으로 정지된다.


=========================================================

System.exit()을 이용해 Timer 스레드 종료하기 2




TimerTest1.java

import java.util.Timer;
import java.util.TimerTask;
import java.awt.Toolkit;
public class TimerTest1 {
   Toolkit toolkit;
   Timer timer;
   public TimerTest1(int seconds) {
        toolkit = Toolkit.getDefaultToolkit();
        timer = new Timer();
        timer.schedule(new TimerTaskTest1(), seconds*1000);
   }
   class TimerTaskTest1 extends TimerTask {
        public void run() {
            System.out.println("Time's up!");
            toolkit.beep();
            //timer.cancel();
            //System.exit()을 불러오기때문에에 필요없음
            System.exit(0);   //AWT thread 정지 
        }
   }
   public static void main(String args[]) {
        System.out.println("About to schedule task.");
        new TimerTest1(3);
        System.out.println("Task scheduled.");
   }
}




C:\javaExample\util>javac TimerTest1.java
C:\javaExample\util>java TimerTest1
About to schedule task.
Task scheduled.
Time's up!




프로그램을 실행시키면 3초 후에 소리를 내며 종료된다.


from:
http://ddoobb.com/programing/java.jsp