無門面模式時:
有門面模式時:
package pattern.facade;
/**
* 門面模式/外觀模式:Facade Pattern
*
* 保安系統:
* 一個保安系統由兩個錄像機、一個感應器和一個報警器組成。
* 由保安操作儀器的啟動和關閉:沒有使用門面模式時，保安必須親自啟動每個儀器。
* @version 2009-6-15
* @author Winty(wintys@gmail.com)
*/
public class FacadeTest{
public static void main(String[] args){
//無門面模式
Camera camera1,camera2;
camera1 = new Camera();
camera2 = new Camera();
Sensor sensor;
sensor = new Sensor();
Alarm alarm;
alarm = new Alarm();
//啟動儀器
camera1.turnOn();
camera2.turnOn();
sensor.activate();
alarm.activate();
System.out.println("");
/////////////////////////////////
//使用門面模式
SecurityFacade security = new SecurityFacade();
security.start();
}
}
/**
* 門面:Facade
*/
class SecurityFacade{
private Camera camera1;
private Camera camera2;
private Sensor sensor;
private Alarm alarm;
public SecurityFacade(){
camera1 = new Camera();
camera2 = new Camera();
sensor = new Sensor();
alarm = new Alarm();
}
//啟動
public void start(){
camera1.turnOn();
camera2.turnOn();
sensor.activate();
alarm.activate();
}
//停止
public void stop(){
camera1.turnOff();
camera2.turnOff();
sensor.deactivate();
alarm.deactivate();
}
}
class Camera{
public void turnOn(){
System.out.println("turn on the Camera.");
}
public void turnOff(){
System.out.println("turn off the Camera.");
}
//轉動
public void rotate(){
System.out.println("rotate the Camera.");
}
}
class Sensor{
public void activate(){
System.out.println("activate the sensor.");
}
public void deactivate(){
System.out.println("deactivate the sensor.");
}
//觸發感應器
public void trigger(){
System.out.println("trigger the sensor.");
}
}
class Alarm{
public void activate(){
System.out.println("activate the alarm.");
}
public void deactivate(){
System.out.println("deactivate the alarm.");
}
//拉響報警器
public void ring(){
System.out.println("ring the alarm.");
}
}
運行結果:
turn on the Camera.
turn on the Camera.
activate the sensor.
activate the alarm.
turn on the Camera.
turn on the Camera.
activate the sensor.
activate the alarm.