方法schedule(TimerTask task,Date time)

该方法的作用就是在指定日期执行一次某任务。

package multiply.com.test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class Run1 {private static Timer timer = new Timer();public static void main(String[] args) throws ParseException {TimerTask task = new TimerTask() {@Overridepublic void run() {System.out.println("运行了，时间为：" + new Date());}};SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String dateString = "2021-10-31 17:57:00";Date date = sdf.parse(dateString);System.out.println("dateString : " + date.toLocaleString() + " CurrentDate : " + new Date().toLocaleString());timer.schedule(task, date);}
}

package multiply.com.test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class Run1TimerIsDaemon {private static Timer timer = new Timer(true);public static void main(String[] args) throws ParseException {TimerTask task = new TimerTask() {@Overridepublic void run() {System.out.println("运行了，时间为：" + new Date());}};SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String dateString = "2021-10-31 17:55:00";Date date = sdf.parse(dateString);System.out.println("dateString : " + date.toLocaleString() + " CurrentDate : " + new Date().toLocaleString());timer.schedule(task, date);}
}

dateString : 2021 Oct 31 18:00:20 CurrentDate : 2021 Oct 31 18:00:10

方法schedule(TimerTask task,Date firstTime,long period)

该方法是在指定日期后，按照指定的间隔周期性地无限循环地执行某一任务。

package multiply.com.test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class Run {public static void main(String[] args) throws ParseException {TimerTask task = new TimerTask() {@Overridepublic void run() {System.out.println("运行了，时间为：" + new Date());}};Timer timer = new Timer();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String dateString = "2021-11-1 10:21:00";Date date = sdf.parse(dateString);System.out.println("dateString : " + date.toLocaleString() + " CurrentDate : " + new Date().toLocaleString());timer.schedule(task, date, 4000);}
}

package multiply.com.test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class Run2_1 {public static void main(String[] args) throws ParseException {TimerTask task = new TimerTask() {@Overridepublic void run() {System.out.println("A运行了，时间为: " + new Date());try {Thread.sleep(5000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("A结束了，时间为: " + new Date());}};Timer timer = new Timer();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String dateString = "2021-11-1 10:28:00";Date date = sdf.parse(dateString);System.out.println("dateString : " + date.toLocaleString() + " CurrentDate : " + new Date().toLocaleString());timer.schedule(task, date,4000);}
}

package multiply.com.test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class Run2 {public static void main(String[] args) throws ParseException {Timer timer = new Timer();TimerTask task1 = new TimerTask() {private int count = 0;@Overridepublic void run() {System.out.println("A运行了，时间为: " + new Date());count++;if (count == 5) {this.cancel();}}};TimerTask task2 = new TimerTask() {@Overridepublic void run() {System.out.println("B运行了，时间为: " + new Date());}};SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String dateString = "2021-11-1 10:38:00";Date date = sdf.parse(dateString);System.out.println("dateString : " + date.toLocaleString() + " CurrentDate : " + new Date().toLocaleString());timer.schedule(task1, date, 4000);timer.schedule(task2, date, 4000);}
}

方法schedule(TimerTask task,long delay)

方法schedule(TimerTask task,long delay,long period)

方法scheduleAtFixedRate(TimerTask task,Date firstTime,long period)

package multiply.com.test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class Run3 {public static void main(String[] args) throws ParseException {Timer timer = new Timer();TimerTask task = new TimerTask() {private int count = 0;@Overridepublic void run() {System.out.println("1 Begin 运行了，时间为：" + new Date());try {Thread.sleep(2000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("1   End 运行了，时间为：" + new Date());count++;if (count == 5) {timer.cancel();}}};SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String dateString1 = "2021-11-1 11:04:00";Date date1 = sdf.parse(dateString1);System.out.println("dateString 1 : " + date1.toLocaleString() + " CurrentDate : " + new Date().toLocaleString());timer.scheduleAtFixedRate(task, date1, 3000);        }
}

package multiply.com.test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class Run4 {public static void main(String[] args) throws ParseException {Timer timer = new Timer();TimerTask task = new TimerTask() {private int count = 0;@Overridepublic void run() {System.out.println("1 Begin 运行了，时间为：" + new Date());try {Thread.sleep(3000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("1   End 运行了，时间为：" + new Date());count++;if (count == 5) {timer.cancel();}}};SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String dateString1 = "2021-11-1 11:08:00";Date date1 = sdf.parse(dateString1);System.out.println("dateString 1 : " + date1.toLocaleString() + " CurrentDate : " + new Date().toLocaleString());        timer.scheduleAtFixedRate(task, date1, 2000);}
}