Java by API/java.util/Timer
Содержание
new Timer()
<source lang="java">
/*
* Output:
Timer task executed. Timer task executed. Timer task executed. Timer task executed. Timer task executed. */ import java.util.Timer; import java.util.TimerTask; class MyTimerTask extends TimerTask {
public void run() {
System.out.println("Timer task executed.");
}
} public class MainClass {
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();
}
}
</source>
Timer: cancel()
<source lang="java">
/* From http://java.sun.ru/docs/books/tutorial/index.html */ /*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* -Redistribution of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
* EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
import java.util.Timer; import java.util.TimerTask; /**
* Simple demo that uses java.util.Timer to schedule a task to execute once 5 * seconds have passed. */
public class Main {
Timer timer;
public Main(int seconds) {
timer = new Timer();
timer.schedule(new RemindTask(), seconds * 1000);
}
class RemindTask extends TimerTask {
public void run() {
System.out.println("Time"s up!");
timer.cancel(); //Terminate the timer thread
}
}
public static void main(String args[]) {
System.out.println("About to schedule task.");
new Main(5);
System.out.println("Task scheduled.");
}
}
</source>
Timer: scheduleAtFixedRate(TimerTask task, long delay, long period)
<source lang="java">
/* From http://java.sun.ru/docs/books/tutorial/index.html */ /*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* -Redistribution of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
* EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
import java.awt.Toolkit; import java.util.Timer; import java.util.TimerTask; /**
* Schedule a task that executes once every second. */
public class Main {
Toolkit toolkit;
Timer timer;
public Main() {
toolkit = Toolkit.getDefaultToolkit();
timer = new Timer();
timer.scheduleAtFixedRate(new RemindTask(), 0, //initial delay
1 * 1000); //subsequent rate
}
class RemindTask extends TimerTask {
int numWarningBeeps = 3;
public void run() {
if (numWarningBeeps-- > 0) {
long time = System.currentTimeMillis();
if (time - scheduledExecutionTime() > 5) {
return;
}
//If it"s not too late, beep.
toolkit.beep();
System.out.println("Beep!");
} else {
toolkit.beep();
System.out.println("Time"s up!");
//timer.cancel(); //Not necessary because we call System.exit
System.exit(0); //Stops the AWT thread (and everything else)
}
}
}
public static void main(String args[]) {
new Main();
}
}
</source>
Timer: schedule(TimerTask task, Date firstTime, long period)
<source lang="java">
/*
* Output:
Timer task executed. Timer task executed. Timer task executed. Timer task executed. Timer task executed. */ import java.util.Timer; import java.util.TimerTask; class MyTimerTask extends TimerTask {
public void run() {
System.out.println("Timer task executed.");
}
} public class MainClass {
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();
}
}
</source>
