Java Timer 对象创建后使用Timer更改其属性!!!

首先来个简单那的实例:

 

package cn.vicky;import java.util.Timer;import java.util.TimerTask;public class MyTimer {private int i = 1;private void change(long time){System.out.println("one : " + i);final Timer timer = new Timer();timer.schedule(new TimerTask(){@Overridepublic void run() {System.out.println("run " + i++);if (i != 5) {timer.cancel();}}}, 10000,1);System.out.println("two : " + i);}public static void main(String[] args) {MyTimer mytimer = new MyTimer();mytimer.change(0);}}

 

我们以一个实例思考,车站,每辆车只能停靠10分钟就必须出站.传统方式,我们是以车站为单位,通过多线程来控制每辆车的出站情况!

package cn.vicky;import java.util.Date;/** * * @author Vicky * 公交汽车 */public class Bus {private String name = "";private boolean inStation = true;/** * 公交汽车在车站中只可能呆10分钟,然后公交就开走,相对于公交车站,公交10分钟后就为空! */public Bus(String carName) {this.name = carName;System.out.println(new Date() + " : a car["+ name +"] into the bus station !");}public void setInStation(boolean inStation) {this.inStation = inStation;}public boolean isInStation() {return inStation;}public void setName(String name) {this.name = name;}public String getName() {return name;}@Overridepublic int hashCode() {final int prime = 31;int result = 1;result = prime * result + ((name == null) ? 0 : name.hashCode());return result;}@Overridepublic boolean equals(Object obj) {if (this == obj)return true;if (obj == null)return false;if (getClass() != obj.getClass())return false;final Bus other = (Bus) obj;if (name == null) {if (other.name != null)return false;} else if (!name.equals(other.name))return false;return true;}@Overridepublic String toString() {return "Bus [" + name + "] :: " + (inStation ? "in station !" : "out station !");}}

 

package cn.vicky;import java.util.ArrayList;import java.util.Date;import java.util.List;/** * * @author Vicky 公交车站 * */public class BusStation {private List<Bus> buses = new ArrayList<Bus>();public static void main(String[] args) {BusStation busstation = new BusStation();System.out.println("the bus station hava " + busstation.checkCars() + " cars !");busstation.addBus(new Bus("car01")); // 第一辆车进入try {Thread.sleep(4000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("the bus station hava " + busstation.checkCars() + " cars !");busstation.addBus(new Bus("car02")); // 第二辆车进入System.out.println("the bus station hava " + busstation.checkCars() + " cars !");try {Thread.sleep(6500);} catch (InterruptedException e) {e.printStackTrace();}busstation.addBus(new Bus("car03")); // 第三辆车进入System.out.println("the bus station hava " + busstation.checkCars() + " cars !");try {Thread.sleep(7000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("the bus station hava " + busstation.checkCars() + " cars !");}public void addBus(Bus bus){this.buses.add(bus);ChangeTask ct = new ChangeTask(bus);Thread thread = new Thread(ct);thread.start();}public List<Bus> getBuses() {return buses;}public void setBuses(List<Bus> buses) {this.buses = buses;}private int checkCars() {int i = 0;for (int j = 0; j < getBuses().size(); j++) {if (getBuses().get(j).isInStation()) {System.out.println(getBuses().get(j));i++;}}return i;}}class ChangeTask implements Runnable{private Bus bus;public ChangeTask(Bus bus) {super();this.bus = bus;}public void run() {try {Thread.sleep(10000);} catch (InterruptedException e) {e.printStackTrace();}bus.setInStation(false);System.out.println(new Date() + " : a car["+ bus.getName() +"] left the bus station !");}}

输出:

the bus station hava 0 cars !
Fri May 21 14:53:58 CST 2010 : a car[car01] into the bus station !
Bus [car01] :: in station !
the bus station hava 1 cars !
Fri May 21 14:54:02 CST 2010 : a car[car02] into the bus station !
Bus [car01] :: in station !
Bus [car02] :: in station !
the bus station hava 2 cars !
Fri May 21 14:54:08 CST 2010 : a car[car01] left the bus station !
Fri May 21 14:54:08 CST 2010 : a car[car03] into the bus station !
Bus [car02] :: in station !
Bus [car03] :: in station !
the bus station hava 2 cars !
Fri May 21 14:54:12 CST 2010 : a car[car02] left the bus station !
Bus [car03] :: in station !
the bus station hava 1 cars !
Fri May 21 14:54:18 CST 2010 : a car[car03] left the bus station !

 

 

现在我们可以使用Java Timer来从每辆车自身来处理!

package cn.vicky;import java.util.Date;import java.util.Timer;import java.util.TimerTask;/** * * @author Vicky * 公交汽车 */public class Bus {private String name = "";private boolean inStation = true;/** * 公交汽车在车站中只可能呆10分钟,然后公交就开走,相对于公交车站,公交10分钟后就为空! */public Bus(String carName) {this.name = carName;System.out.println(new Date() + " : a car["+ name +"] into the bus station !");final Timer timer = new Timer();timer.schedule(new TimerTask(){@Overridepublic void run() {setInStation(false);if (!inStation) {System.out.println(new Date() + " : a car["+ name +"] left the bus station !");timer.cancel();}}}, 10000, 1);}public void setInStation(boolean inStation) {this.inStation = inStation;}public boolean isInStation() {return inStation;}public void setName(String name) {this.name = name;}public String getName() {return name;}@Overridepublic int hashCode() {final int prime = 31;int result = 1;result = prime * result + ((name == null) ? 0 : name.hashCode());return result;}@Overridepublic boolean equals(Object obj) {if (this == obj)return true;if (obj == null)return false;if (getClass() != obj.getClass())return false;final Bus other = (Bus) obj;if (name == null) {if (other.name != null)return false;} else if (!name.equals(other.name))return false;return true;}@Overridepublic String toString() {return "Bus [" + name + "] :: " + (inStation ? "in station !" : "out station !");}}

 

package cn.vicky;import java.util.ArrayList;import java.util.List;/** * * @author Vicky 公交车站 * */public class BusStation {private List<Bus> buses = new ArrayList<Bus>();public static void main(String[] args) {BusStation busstation = new BusStation();System.out.println("the bus station hava " + busstation.checkCars() + " cars !");busstation.getBuses().add(new Bus("car01")); // 第一辆车进入try {Thread.sleep(4000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("the bus station hava " + busstation.checkCars() + " cars !");busstation.getBuses().add(new Bus("car02")); // 第二辆车进入System.out.println("the bus station hava " + busstation.checkCars() + " cars !");try {Thread.sleep(6500);} catch (InterruptedException e) {e.printStackTrace();}busstation.getBuses().add(new Bus("car03")); // 第三辆车进入System.out.println("the bus station hava " + busstation.checkCars() + " cars !");try {Thread.sleep(7000);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("the bus station hava " + busstation.checkCars() + " cars !");}public List<Bus> getBuses() {return buses;}public void setBuses(List<Bus> buses) {this.buses = buses;}private int checkCars() {int i = 0;for (int j = 0; j < getBuses().size(); j++) {if (getBuses().get(j).isInStation()) {System.out.println(getBuses().get(j));i++;}}return i;}}

 

打印:

the bus station hava 0 cars !
Fri May 21 14:57:11 CST 2010 : a car[car01] into the bus station !
Bus [car01] :: in station !
the bus station hava 1 cars !
Fri May 21 14:57:15 CST 2010 : a car[car02] into the bus station !
Bus [car01] :: in station !
Bus [car02] :: in station !
the bus station hava 2 cars !
Fri May 21 14:57:21 CST 2010 : a car[car01] left the bus station !
Fri May 21 14:57:21 CST 2010 : a car[car03] into the bus station !
Bus [car02] :: in station !
Bus [car03] :: in station !
the bus station hava 2 cars !
Fri May 21 14:57:25 CST 2010 : a car[car02] left the bus station !
Bus [car03] :: in station !
the bus station hava 1 cars !
Fri May 21 14:57:31 CST 2010 : a car[car03] left the bus station !

但仔细想想,其实这2种方式,是完全一致的!!!仅供参考!