内部类综合运用 温室的运作（策略模式）

事件的框架：

public abstract class Event

{

private long eventTime;

protected final long delayTime;

public Event(long delayTime)

{

this.delayTime = delayTime;

start();

}

public void start()

{

eventTime = System.nanoTime() + delayTime;

}

public boolean ready()

{

return System.nanoTime() >=eventTime;

}

public abstract void action();

}

控制器的类

import java.util.*;

public class Controller

{

private List<Event> eventList = new ArrayList<Event>();

public void addEvent(Event c)

{

eventList.add(c);

}

public void run()

{

while (eventList.size()>0)

{

for (Event e : new ArrayList<Event>(eventList) )

{

if (e.ready())

{

System.out.println(e);

e.action();

eventList.remove(e);

}

}

}

}

}

温室的控制类

public class GreenhouseControls extends Controller

{

//灯光系统部分

private boolean light = false;

//控制灯光系统的内部类

//开灯内部类

public class LightOn extends Event

{

public LightOn (long delayTime)

{

super(delayTime);

}

public void action()

{

//打开电灯

light = true;

}

public String toString()

{

return "Light is on";

}

}

//关灯内部类

public class LightOff extends Event

{

public LightOff (long delayTime)

{

super(delayTime);

}

public void action()

{

//关闭电灯

light = false;

}

public String toString()

{

return "Light is off";

}

}

//水利部分

private boolean water = false;

public class WaterOn extends Event

{

public WaterOn (long delayTime)

{

super(delayTime);

}

public void action()

{

water = true;

}

public String toString()

{

return "Water is on";

}

}

public class WaterOff extends Event

{

public WaterOff (long delayTime)

{

super(delayTime);

}

public void action()

{

water = false;

}

public String toString()

{

return "Water is off";

}

}

//温度控制

private String thermostat = "Day";

public class ThermostatNight extends Event

{

public ThermostatNight(long delayTime)

{

super(delayTime);

}

public void action()

{

thermostat = "Night";

}

public String toString()

{

return "Thermostat on night setting";

}



}

public class ThermostatDay extends Event

{

public ThermostatDay(long delayTime)

{

super(delayTime);

}

public void action()

{

thermostat = "Day";

}

public String toString()

{

return "Thermostat on Day setting";

}



}

//铃声系统

public class Bell extends Event

{

public Bell(long delayTime)

{

super(delayTime);

}

public void action()

{

addEvent(new Bell(delayTime));

}

public String toString()

{

return "Bing";

}

}

public class Restart extends Event

{

private Event[] eventList;

public Restart(long delayTime,Event [] eventList)

{

super(delayTime);

this.eventList = eventList;

for(Event e : eventList)

{

addEvent(e);

}

}

public void action()

{

for(Event e : eventList)

{

e.start();// Return each event

addEvent(e);

}

start();//Return this Event

addEvent(this);

}

public String toString()

{

return "Restarting system";

}

}

public static class Terminate extends Event

{

public Terminate(long delayTime)

{

super(delayTime);

}

public void action()

{

System.exit(0);

}

public String toString()

{

return "Terminating";

}

}



}

温室的启动类

public class GreenhouseController

{

public static void main(String args[])

{

GreenhouseControls gc = new GreenhouseControls();

gc.addEvent(gc.new Bell(900));

//让温室工作的时间列表

Event[] eventList =

{

gc.new ThermostatNight(0),

gc.new LightOn(200),

gc.new LightOff(400),

gc.new WaterOn(600),

gc.new WaterOff(800),

gc.new ThermostatDay(1400)

};

gc.addEvent(gc.new Restart(2000,eventList));

if(args.length == 1)

{

gc.addEvent(new GreenhouseControls.Terminate(new Integer(args[0])));



}

gc.run();

}

}



输出

Bing

Thermostat on night setting

Light is on

Light is off

Water is on

Water is off

Thermostat on Day setting

Restarting system

Terminating