task-所安排的任务 time-执行任务的时间
作用:在时间等于或者超过time的时候执行且仅执行一次
import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Timer; import java.util.TimerTask; public class MyTimerTask extends TimerTask { private Integer cout = 0; @Override public void run() { Calendar calendar = Calendar.getInstance(); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss"); System.out.println("Current Time:"+format.format(calendar.getTime()));//获取当前系统时间 System.out.println("NO.1"); } public static void main(String[] args) { MyTimerTask task = new MyTimerTask(); Calendar calendar = Calendar.getInstance(); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss"); System.out.println(format.format(calendar.getTime())); calendar.add(Calendar.SECOND,3);//获取距离当前时间3秒后的时间 Timer timer = new Timer(); timer.schedule(task,calendar.getTime()); } }
task-所要安排执行的任务 time-首次执行任务的时间 period-执行一次task的时间间隔,单位毫秒
作用:时间等于或者超过time首次执行task,之后每隔period毫秒重复执行一次任务
import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Timer; import java.util.TimerTask; public class MyTimerTask extends TimerTask { private Integer cout = 0; @Override public void run() { Calendar calendar = Calendar.getInstance(); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss"); System.out.println("Current Time:"+format.format(calendar.getTime()));//获取当前系统时间 System.out.println("NO.1"); } public static void main(String[] args) { MyTimerTask task = new MyTimerTask(); Calendar calendar= Calendar.getInstance(); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss"); System.out.println(format.format(calendar.getTime())); calendar.add(Calendar.SECOND,3);//获取距离当前时间3秒后的时间 Timer timer = new Timer(); //timer.schedule(task,calendar.getTime()); timer.schedule(task,calendar.getTime(),2000); } }
task-所要安排的任务 delay-执行任务前的延迟时间,单位毫秒
作用:等待delay毫秒后执行仅执行一次task
import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Timer; import java.util.TimerTask; public class MyTimerTask extends TimerTask { @Override public void run() { Calendar calendar = Calendar.getInstance(); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss"); System.out.println("Current Time:"+format.format(calendar.getTime()));//获取当前系统时间 System.out.println("NO.1"); } public static void main(String[] args) { MyTimerTask task = new MyTimerTask(); Calendar calendar = Calendar.getInstance(); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss"); System.out.println(format.format(calendar.getTime())); //calendar.add(Calendar.SECOND,3);//获取距离当前时间3秒后的时间 Timer timer = new Timer(); //timer.schedule(task,calendar.getTime()); //timer.schedule(task,calendar.getTime(),2000); timer.schedule(task,2000); } }
作用:在等待delay毫秒后首次执行task,每隔period毫秒重复执行task
import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Timer; import java.util.TimerTask; public class MyTimerTask extends TimerTask { @Override public void run() { Calendar calendar = Calendar.getInstance(); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss"); System.out.println("Current Time:"+format.format(calendar.getTime()));//获取当前系统时间 System.out.println("NO.1"); } public static void main(String[] args) { MyTimerTask task = new MyTimerTask(); Calendar calendar = Calendar.getInstance(); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss"); System.out.println(format.format(calendar.getTime())); //calendar.add(Calendar.SECOND,3);//获取距离当前时间3秒后的时间 Timer timer = new Timer(); //timer.schedule(task,calendar.getTime()); //timer.schedule(task,calendar.getTime(),2000); //timer.schedule(task,2000); timer.schedule(task,2000,3000); } }
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