HeadFirst设计模式之门面模式

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mob604756f9eb4d 2016-03-09 17:02:00

一、

1.The Facade Pattern provides a unifi ed interface to a set of interfaces in a subsytem. Facade defi nes a higher-level interface that makes the subsystem easier to use.

2.Facades and adapters may wrap multiple classes, but a facade’s intent is to simplify, while an adapter’s is to convert

the interface to something different.

HeadFirst设计模式之门面模式_ide

二、

实现家庭影院

 1 package headfirst.designpatterns.facade.hometheater;
 2 
 3 public class HomeTheaterFacade {
 4     Amplifier amp;
 5     Tuner tuner;
 6     DvdPlayer dvd;
 7     CdPlayer cd;
 8     Projector projector;
 9     TheaterLights lights;
10     Screen screen;
11     PopcornPopper popper;
12  
13     public HomeTheaterFacade(Amplifier amp, 
14                  Tuner tuner, 
15                  DvdPlayer dvd, 
16                  CdPlayer cd, 
17                  Projector projector, 
18                  Screen screen,
19                  TheaterLights lights,
20                  PopcornPopper popper) {
21  
22         this.amp = amp;
23         this.tuner = tuner;
24         this.dvd = dvd;
25         this.cd = cd;
26         this.projector = projector;
27         this.screen = screen;
28         this.lights = lights;
29         this.popper = popper;
30     }
31  
32     public void watchMovie(String movie) {
33         System.out.println("Get ready to watch a movie...");
34         popper.on();
35         popper.pop();
36         lights.dim(10);
37         screen.down();
38         projector.on();
39         projector.wideScreenMode();
40         amp.on();
41         amp.setDvd(dvd);
42         amp.setSurroundSound();
43         amp.setVolume(5);
44         dvd.on();
45         dvd.play(movie);
46     }
47  
48  
49     public void endMovie() {
50         System.out.println("Shutting movie theater down...");
51         popper.off();
52         lights.on();
53         screen.up();
54         projector.off();
55         amp.off();
56         dvd.stop();
57         dvd.eject();
58         dvd.off();
59     }
60 
61     public void listenToCd(String cdTitle) {
62         System.out.println("Get ready for an audiopile experence...");
63         lights.on();
64         amp.on();
65         amp.setVolume(5);
66         amp.setCd(cd);
67         amp.setStereoSound();
68         cd.on();
69         cd.play(cdTitle);
70     }
71 
72     public void endCd() {
73         System.out.println("Shutting down CD...");
74         amp.off();
75         amp.setCd(cd);
76         cd.eject();
77         cd.off();
78     }
79 
80     public void listenToRadio(double frequency) {
81         System.out.println("Tuning in the airwaves...");
82         tuner.on();
83         tuner.setFrequency(frequency);
84         amp.on();
85         amp.setVolume(5);
86         amp.setTuner(tuner);
87     }
88 
89     public void endRadio() {
90         System.out.println("Shutting down the tuner...");
91         tuner.off();
92         amp.off();
93     }
94 }

 1 package headfirst.designpatterns.facade.hometheater;
 2 
 3 public class HomeTheaterTestDrive {
 4     public static void main(String[] args) {
 5         Amplifier amp = new Amplifier("Top-O-Line Amplifier");
 6         Tuner tuner = new Tuner("Top-O-Line AM/FM Tuner", amp);
 7         DvdPlayer dvd = new DvdPlayer("Top-O-Line DVD Player", amp);
 8         CdPlayer cd = new CdPlayer("Top-O-Line CD Player", amp);
 9         Projector projector = new Projector("Top-O-Line Projector", dvd);
10         TheaterLights lights = new TheaterLights("Theater Ceiling Lights");
11         Screen screen = new Screen("Theater Screen");
12         PopcornPopper popper = new PopcornPopper("Popcorn Popper");
13  
14         HomeTheaterFacade homeTheater = 
15                 new HomeTheaterFacade(amp, tuner, dvd, cd, 
16                         projector, screen, lights, popper);
17  
18         homeTheater.watchMovie("Raiders of the Lost Ark");
19         homeTheater.endMovie();
20     }
21 }

 1 package headfirst.designpatterns.facade.hometheater;
 2 
 3 public class Amplifier {
 4     String description;
 5     Tuner tuner;
 6     DvdPlayer dvd;
 7     CdPlayer cd;
 8     
 9     public Amplifier(String description) {
10         this.description = description;
11     }
12  
13     public void on() {
14         System.out.println(description + " on");
15     }
16  
17     public void off() {
18         System.out.println(description + " off");
19     }
20  
21     public void setStereoSound() {
22         System.out.println(description + " stereo mode on");
23     }
24  
25     public void setSurroundSound() {
26         System.out.println(description + " surround sound on (5 speakers, 1 subwoofer)");
27     }
28  
29     public void setVolume(int level) {
30         System.out.println(description + " setting volume to " + level);
31     }
32 
33     public void setTuner(Tuner tuner) {
34         System.out.println(description + " setting tuner to " + dvd);
35         this.tuner = tuner;
36     }
37   
38     public void setDvd(DvdPlayer dvd) {
39         System.out.println(description + " setting DVD player to " + dvd);
40         this.dvd = dvd;
41     }
42  
43     public void setCd(CdPlayer cd) {
44         System.out.println(description + " setting CD player to " + cd);
45         this.cd = cd;
46     }
47  
48     public String toString() {
49         return description;
50     }
51 }

 1 package headfirst.designpatterns.facade.hometheater;
 2 
 3 public class Tuner {
 4     String description;
 5     Amplifier amplifier;
 6     double frequency;
 7 
 8     public Tuner(String description, Amplifier amplifier) {
 9         this.description = description;
10     }
11 
12     public void on() {
13         System.out.println(description + " on");
14     }
15 
16     public void off() {
17         System.out.println(description + " off");
18     }
19 
20     public void setFrequency(double frequency) {
21         System.out.println(description + " setting frequency to " + frequency);
22         this.frequency = frequency;
23     }
24 
25     public void setAm() {
26         System.out.println(description + " setting AM mode");
27     }
28 
29     public void setFm() {
30         System.out.println(description + " setting FM mode");
31     }
32 
33     public String toString() {
34         return description;
35     }
36 }