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CS-Notes/notes/设计模式.md
CyC2018 7e4d5152f7 auto commit
2018-02-22 14:47:22 +08:00

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<!-- GFM-TOC -->
* [?? 1 ?? ?????????](#??-1-??-?????????)
* [?? 2 ?? ???????](#??-2-??-???????)
* [?? 3 ?? ?????](#??-3-??-?????)
* [?? 4 ?? ??????](#??-4-??-??????)
* [4.1 ?????](#41-?????)
* [4.2 ??????????](#42-??????????)
* [4.3 ???????](#43-???????)
* [?? 5 ?? ??????](#??-5-??-??????)
* [?? 6 ?? ??????](#??-6-??-??????)
* [?? 7 ?? ???????????????](#??-7-??-???????????????)
* [7.1 ????????](#71-????????)
* [7.2 ?????](#72-?????)
* [?? 8 ?? ??Ùã????](#??-8-??-??Ùã????)
* [?? 9 ?? ?????????????](#??-9-??-?????????????)
* [9.1 ????????](#91-????????)
* [9.2 Java ??????????](#92-java-??????????)
* [9.3 ?????](#93-?????)
* [?? 10 ?? ????](#??-10-??-????)
* [?? 11 ?? ?????? // TODO](#??-11-??-??????--todo)
* [?? 12 ?? ??????](#??-12-??-??????)
* [12.1 MVC](#121-mvc)
* [12.1.1 ??? MVC](#1211-???-mvc)
* [12.1.2 Web ?§Ö? MVC](#1212-web-?§Ö?-mvc)
* [?? 13 ?? ?????????](#??-13-??-?????????)
* [?? 14 ?? ?????? // TODO](#??-14-??-??????--todo)
<!-- GFM-TOC -->
# ?? 1 ?? ?????????
**1. ?????????**
?????????????????????????????????§Ö?????????????????û`?¨¢?
????????????????????????????????????????????????????
**2. ????????**
???????????????§Ó???????????§Ù????
**3. ????????**
??¨¹?§Ö?????????????????????????????????????????????????????§Ù????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/144d28a0-1dc5-4aba-8961-ced5bc88428a.jpg)
**4. ??????**
**????<3F>£**??????<3F>£???????§Ü???§Ö?????????
**??????????????????????** ?????????????????????????????????????????§Ö????????????????????????????????????????????????????????????????
????????????§Ü???§Ö???????????????????????§Ü???§Ö???????????????????§Ü???§Ù????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/1c8ccf5c-7ecd-4b8a-b160-3f72a510ce26.png)
**???????????¨¹??** ???????? has-a ????????????????????????????????????????Íè???????????????????¨À?????§à??????????§»??????????????????????????
???????????? Duck ??????? FlyBehavior ?? QuackBehavior ??performQuack() ?? performFly() ??????§Ú???????????????????????????? Duck ??????????????????? FlyBehavior ?? QuackBehavior ???????????????????????§Ú??
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/29574e6f-295c-444e-83c7-b162e8a73a83.jpg)
**5. ????????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/e13833c8-e215-462e-855c-1d362bb8d4a0.jpg)
**6. ??????**
**??????** ???????????ÈÉ???????????????????????????<3F>I????????????<3F>£?????????????????
**7. ??????**
```java
public abstract class Duck {
FlyBehavior flyBehavior;
QuackBehavior quackBehavior;
public Duck(){
}
public void performFly(){
flyBehavior.fly();
}
public void setFlyBehavior(FlyBehavior fb){
flyBehavior = fb;
}
public void performQuack(){
quackBehavior.quack();
}
public void setQuackBehavior(QuackBehavior qb){
quackBehavior = qb;
}
}
```
```java
public class MallarDuck extends Duck{
public MallarDuck(){
flyBehavior = new FlyWithWings();
quackBehavior = new Quack();
}
}
```
```java
public interface FlyBehavior {
void fly();
}
```
```java
public class FlyNoWay implements FlyBehavior{
@Override
public void fly() {
System.out.println("FlyBehavior.FlyNoWay");
}
}
```
```java
public class FlyWithWings implements FlyBehavior{
@Override
public void fly() {
System.out.println("FlyBehavior.FlyWithWings");
}
}
```
```java
public interface QuackBehavior {
void quack();
}
```
```java
public class Quack implements QuackBehavior{
@Override
public void quack() {
System.out.println("QuackBehavior.Quack");
}
}
```
```java
public class MuteQuack implements QuackBehavior{
@Override
public void quack() {
System.out.println("QuackBehavior.MuteQuack");
}
}
```
```java
public class Squeak implements QuackBehavior{
@Override
public void quack() {
System.out.println("QuackBehavior.Squeak");
}
}
```
```java
public class MiniDuckSimulator {
public static void main(String[] args) {
Duck mallarDuck = new MallarDuck();
mallarDuck.performQuack();
mallarDuck.performFly();
mallarDuck.setFlyBehavior(new FlyNoWay());
mallarDuck.performFly();
}
}
```
??§ß??
```html
QuackBehavior.Quack
FlyBehavior.FlyWithWings
FlyBehavior.FlyNoWay
```
# ?? 2 ?? ???????
**1. ??????**
???????????????????????????????????????????????????????????????????????????Subject??????????????????????????Observer???????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/26cb5e7e-6fa3-44ad-854e-fe24d1a5278c.jpg)
**2. ?????**
?????§à??????????????????????????????????????????????????????§Ò????????§»???????
?????????????????????????????????????????????????§µ??????????????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/5c558190-fccd-4b5e-98ed-1896653fc97f.jpg)
**3. ????????**
???????????????????????????????????????????????§Ø???????????????????????
**4. ??????????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/760a5d63-d96d-4dd9-bf9a-c3d126b2f401.jpg)
**5. ??????**
**?????????????????????????** ????????????????????????????????????????????????????????????????????????ÒÔ????????????????????§Ö??????????<3F>£??
**6. ??????**
```java
public interface Subject {
public void resisterObserver(Observer o);
public void removeObserver(Observer o);
public void notifyObserver();
}
```
```java
import java.util.ArrayList;
import java.util.List;
public class WeatherData implements Subject {
private List<Observer> observers;
private float temperature;
private float humidity;
private float pressure;
public WeatherData() {
observers = new ArrayList<>();
}
@Override
public void resisterObserver(Observer o) {
observers.add(o);
}
@Override
public void removeObserver(Observer o) {
int i = observers.indexOf(o);
if (i >= 0) {
observers.remove(i);
}
}
@Override
public void notifyObserver() {
for (Observer o : observers) {
o.update(temperature, humidity, pressure);
}
}
public void setMeasurements(float temperature, float humidity, float pressure) {
this.temperature = temperature;
this.humidity = humidity;
this.pressure = pressure;
notifyObserver();
}
}
```
```java
public interface Observer {
public void update(float temp, float humidity, float pressure);
}
```
```java
public class CurrentConditionsDisplay implements Observer {
private Subject weatherData;
public CurrentConditionsDisplay(Subject weatherData) {
this.weatherData = weatherData;
weatherData.resisterObserver(this);
}
@Override
public void update(float temp, float humidity, float pressure) {
System.out.println("CurrentConditionsDisplay.update:" + temp + " " + humidity + " " + pressure);
}
}
```
```java
public class StatisticsDisplay implements Observer {
private Subject weatherData;
public StatisticsDisplay(Subject weatherData) {
this.weatherData = weatherData;
weatherData.resisterObserver(this);
}
@Override
public void update(float temp, float humidity, float pressure) {
System.out.println("StatisticsDisplay.update:" + temp + " " + humidity + " " + pressure);
}
}
```
```java
public class WeatherStation {
public static void main(String[] args) {
WeatherData weatherData = new WeatherData();
CurrentConditionsDisplay currentConditionsDisplay = new CurrentConditionsDisplay(weatherData);
StatisticsDisplay statisticsDisplay = new StatisticsDisplay(weatherData);
weatherData.setMeasurements(0, 0, 0);
weatherData.setMeasurements(1, 1, 1);
}
}
```
??§ß??
```html
CurrentConditionsDisplay.update:0.0 0.0 0.0
StatisticsDisplay.update:0.0 0.0 0.0
CurrentConditionsDisplay.update:1.0 1.0 1.0
StatisticsDisplay.update:1.0 1.0 1.0
```
# ?? 3 ?? ?????
**1. ????????**
?????????????????????????????????????????????????????????????????????
**2. ??????**
?????????¦È??????????????????????????????????§Ú??§Ö?????????????
????? DarkRoast ???? Mocha ??????Mocha ??????? Whip ??????????????????????????????? cost() ????????????????? cost() ??????????????????? cost() ???????????????? DarkRoast ????? Mocha??????????? Mocha ???? DarkRoast?????????? Whip ?????? Whip ???? Mocha???????? cost() ?????????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/41a4cb30-f393-4b3b-abe4-9941ccf8fa1f.jpg)
**3. ?????**
??????????????????????????????§à?????????????????????????????????????????????????????????????????????????????????????????¦Í??¦²?????????????????????¦Å??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????¦Â?¦Å??????????§à??????????????????????§Ú??????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/3dc454fb-efd4-4eb8-afde-785b2182caeb.jpg)
**4. ???????????????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/9c997ac5-c8a7-44fe-bf45-2c10eb773e53.jpg)
**5. ??????**
**??????????????????????**???????????????????????????????????§Ú??????????????????????????????????????????????????????????????????????????????????????????????????????????????§á??????????
**6. Java I/O ?§Ö????????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/2a40042a-03c8-4556-ad1f-72d89f8c555c.jpg)
**7. ???????**
```java
public interface Beverage {
public double cost();
}
```
```java
public class HouseBlend implements Beverage{
@Override
public double cost() {
return 1;
}
}
```
```java
public class DarkRoast implements Beverage{
@Override
public double cost() {
return 1;
}
}
```
```java
public abstract class CondimentDecorator implements Beverage{
protected Beverage beverage;
}
```
```java
public class Mocha extends CondimentDecorator {
public Mocha(Beverage beverage) {
this.beverage = beverage;
}
@Override
public double cost() {
return 1 + beverage.cost();
}
}
```
```java
public class Milk extends CondimentDecorator {
public Milk(Beverage beverage) {
this.beverage = beverage;
}
@Override
public double cost() {
return 1 + beverage.cost();
}
}
```
```java
public class StartbuzzCoffee {
public static void main(String[] args) {
Beverage beverage = new HouseBlend();
beverage = new Mocha(beverage);
beverage = new Milk(beverage);
System.out.println(beverage.cost());
}
}
```
???
```html
3.0
```
# ?? 4 ?? ??????
## 4.1 ?????
**1. ????????**
?§Ó???? Pizza??????????????¨°???????????????? Pizza ????
**2. ????**
?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????§µ??¨´????????????????????????????????????????????????????????????????????????????????§»????????????????????????????????§Ø???????????¨¹????????????§Ö????????????????????????????????????????????????????§Ö?????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/c470eb9b-fb05-45c5-8bb7-1057dc3c16de.jpg)
**3. ??????????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/dc3e704c-7c57-42b8-93ea-ddd068665964.jpg)
**4. ???????**
```java
public interface Pizza {
public void make();
}
```
```java
public class CheesePizza implements Pizza{
@Override
public void make() {
System.out.println("CheesePizza");
}
}
```
```java
public class GreekPizza implements Pizza{
@Override
public void make() {
System.out.println("GreekPizza");
}
}
```
```java
public class SimplePizzaFactory {
public Pizza createPizza(String type) {
if (type.equals("cheese")) {
return new CheesePizza();
} else if (type.equals("greek")) {
return new GreekPizza();
} else {
throw new UnsupportedOperationException();
}
}
}
```
```java
public class PizzaStore {
public static void main(String[] args) {
SimplePizzaFactory simplePizzaFactory = new SimplePizzaFactory();
Pizza pizza = simplePizzaFactory.createPizza("cheese");
pizza.make();
}
}
```
???§ß??
```java
CheesePizza
```
## 4.2 ??????????
**1. ????????**
????????? Pizza ???????????????????????????¦Æ?????????????????íà?????????????? cheese ????? Pizza ?????????????????? Pizza ???????
**2. ??????**
?????????????????????????????????????????????????????????????????????????????
**3. ?????**
???????§µ???????????????????????????????§µ???????????????????????????????????????????????????????????????????????????????????????????§Õ????????????????????????????????????????????????????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/903093ec-acc8-4f9b-bf2c-b990b9a5390c.jpg)
**4. ??????????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/664f8901-5dc7-4644-a072-dad88cc5133a.jpg)
**5. ???????**
```java
public interface Pizza {
public void make();
}
```
```java
public interface PizzaStore {
public Pizza orderPizza(String item);
}
```
```java
public class NYStyleCheesePizza implements Pizza{
@Override
public void make() {
System.out.println("NYStyleCheesePizza is making..");
}
}
```
```java
public class NYStyleVeggiePizza implements Pizza {
@Override
public void make() {
System.out.println("NYStyleVeggiePizza is making..");
}
}
```
```java
public class ChicagoStyleCheesePizza implements Pizza{
@Override
public void make() {
System.out.println("ChicagoStyleCheesePizza is making..");
}
}
```
```java
public class ChicagoStyleVeggiePizza implements Pizza{
@Override
public void make() {
System.out.println("ChicagoStyleVeggiePizza is making..");
}
}
```
```java
public class NYPizzaStore implements PizzaStore {
@Override
public Pizza orderPizza(String item) {
Pizza pizza = null;
if (item.equals("cheese")) {
pizza = new NYStyleCheesePizza();
} else if (item.equals("veggie")) {
pizza = new NYStyleVeggiePizza();
} else {
throw new UnsupportedOperationException();
}
pizza.make();
return pizza;
}
}
```
```java
public class ChicagoPizzaStore implements PizzaStore {
@Override
public Pizza orderPizza(String item) {
Pizza pizza = null;
if (item.equals("cheese")) {
pizza = new ChicagoStyleCheesePizza();
} else if (item.equals("veggie")) {
pizza = new ChicagoStyleVeggiePizza();
} else {
throw new UnsupportedOperationException();
}
pizza.make();
return pizza;
}
}
```
```java
public class PizzaTestDrive {
public static void main(String[] args) {
PizzaStore nyStore = new NYPizzaStore();
nyStore.orderPizza("cheese");
PizzaStore chicagoStore = new ChicagoPizzaStore();
chicagoStore.orderPizza("cheese");
}
}
```
???§ß??
```html
NYStyleCheesePizza is making..
ChicagoStyleCheesePizza is making..
```
## 4.3 ???????
**1. ??????**
**???????????**??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????íà????? PizzaStore ???????????????????????????? Pizza ?????????????????? Pizza ?????????????????¨´??? Pizza ????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/ddf72ca9-c0be-49d7-ab81-57a99a974c8e.jpg)
**2. ??????**
???????????????????????????????ÈÉ???????????????????
**3. ?????**
????????????????????ÈÉ???????????????????????????§»??????????????????????????????????????????????????????????????????§Ü?????????????????????????????????????????????????AbstractFactory ?§Ö? CreateProductA ?? CreateProductB ????????????????????????????????????????????????????????????????????‰^?????????????????????????? Client ?????Client ???? AbstractFactory ????????????????????????????????????????????????§Ü?????????Client ??????????????§¿??????????????????????????????????????? Cilent ????? AbstractFactory ????????????????§³?
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/d301774f-e0d2-41f3-95f4-bfe39859b52e.jpg)
**4. ??????????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/8785dabd-1285-4bd0-b3aa-b05cc060a24a.jpg)
**5. ???????**
```java
public interface Dough {
public String doughType();
}
```
```java
public class ThickCrustDough implements Dough{
@Override
public String doughType() {
return "ThickCrustDough";
}
}
```
```java
public class ThinCrustDough implements Dough {
@Override
public String doughType() {
return "ThinCrustDough";
}
}
```
```java
public interface Sauce {
public String sauceType();
}
```
```java
public class MarinaraSauce implements Sauce {
@Override
public String sauceType() {
return "MarinaraSauce";
}
}
```
```java
public class PlumTomatoSauce implements Sauce {
@Override
public String sauceType() {
return "PlumTomatoSauce";
}
}
```
```java
public interface PizzaIngredientFactory {
public Dough createDough();
public Sauce createSauce();
}
```
```java
public class NYPizzaIngredientFactory implements PizzaIngredientFactory{
@Override
public Dough createDough() {
return new ThickCrustDough();
}
@Override
public Sauce createSauce() {
return new MarinaraSauce();
}
}
```
```java
public class ChicagoPizzaIngredientFactory implements PizzaIngredientFactory{
@Override
public Dough createDough() {
return new ThinCrustDough();
}
@Override
public Sauce createSauce() {
return new PlumTomatoSauce();
}
}
```
```java
public class NYPizzaStore {
private PizzaIngredientFactory ingredientFactory;
public NYPizzaStore() {
ingredientFactory = new NYPizzaIngredientFactory();
}
public void makePizza() {
Dough dough = ingredientFactory.createDough();
Sauce sauce = ingredientFactory.createSauce();
System.out.println(dough.doughType());
System.out.println(sauce.sauceType());
}
}
```
```java
public class NYPizzaStoreTestDrive {
public static void main(String[] args) {
NYPizzaStore nyPizzaStore = new NYPizzaStore();
nyPizzaStore.makePizza();
}
}
```
???§ß??
```html
ThickCrustDough
MarinaraSauce
```
# ?? 5 ?? ??????
**1. ??????**
???????????????????????????????????
**2. ?????**
???????? Java ??????????§Û????????????§à???????????????§à?????????¨²?????????§Ò????????????????¨²?????????????????¦·?????§à????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/59aff6c1-8bc5-48e4-9e9c-082baeb2f274.jpg)
**3. ???????**
????????§µ???§à???????????????????????????????????????????????????????????§à??????????????????????????????????????????????????????????????? if(uniqueInstance == null) ??????ï…????????????? uniqueInstance ??§à????????
```java
public class Singleton {
private static Singleton uniqueInstance;
private Singleton() {
}
public static Singleton getUniqueInstance() {
if (uniqueInstance == null) {
uniqueInstance = new Singleton();
}
return uniqueInstance;
}
}
```
**4. ???????????????????**
?????? getUniqueInstance() ????????????????¡Â????????????????????????????? uniqueInstance ???????§Ø?????????????????????????????????????????????????????????????????
```java
public static synchronized Singleton getUniqueInstance() {
if (uniqueInstance == null) {
uniqueInstance = new Singleton();
}
return uniqueInstance;
}
```
**5. ????????????????????**
????????????????????????????
```java
private static Singleton uniqueInstance = new Singleton();
```
**6. ????????????????????**
????????????????????????? getUniqueInstance() ???????§Þ?????????????????? uniqueInstance = new Singleton(); ?????????????¨À??????????????????§Ø? uniqueInstance ???????????????????????????????????
```java
public class Singleton {
private volatile static Singleton uniqueInstance;
private Singleton() {
}
public static synchronized Singleton getUniqueInstance() {
if (uniqueInstance == null) {
synchronized (Singleton.class) {
if (uniqueInstance == null) {
uniqueInstance = new Singleton();
}
}
}
return uniqueInstance;
}
}
```
# ?? 6 ?? ??????
**1. ????????**
????????????????§Ü??????????????????????????????????????????????§Ù??????íà????????????³‡
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/7b8f0d8e-a4fa-4c9d-b9a0-3e6a11cb3e33.jpg)
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/c3ca36b2-8459-4cf1-98b0-cc95a0e94f20.jpg)
**2. ??????**
??????????????????¨°????????????????????????
**3. ?????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/1e09d75f-6268-4425-acf8-8ecd1b4a0ef3.jpg)
**4. ??????????**
Invoker ?????????????????????????????????????? execute() ??????Receiver ???????????????????????ConcreteCommand ?????????? Receiver ??????????????§Ú? Receiver ??????????????? LightOnCommand ????? excute ??????§Ú? Light ??????????Light ??????????? on() ??????????????Invoker ???? Client ??????????????????????? Invoker ?????????????????? Client ????????????§»??????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/5ef94f62-98ce-464d-a646-842d9c72c8b8.jpg)
**5. ???????**
```java
public interface Command {
public void execute();
}
```
```java
public class Light {
public void on() {
System.out.println("Light is on!");
}
public void off() {
System.out.println("Light is off!");
}
}
```
```java
public class LightOnCommand implements Command{
Light light;
public LightOnCommand(Light light) {
this.light = light;
}
@Override
public void execute() {
light.on();
}
}
```
```java
/**
* ???????
*/
public class SimpleRemoteControl {
Command slot;
public SimpleRemoteControl() {
}
public void setCommand(Command command) {
this.slot = command;
}
public void buttonWasPressed() {
slot.execute();
}
}
```
```java
public class RemoteLoader {
public static void main(String[] args) {
SimpleRemoteControl remote = new SimpleRemoteControl();
Light light = new Light();
LightOnCommand lightOnCommand = new LightOnCommand(light);
remote.setCommand(lightOnCommand);
remote.buttonWasPressed();
}
}
```
???
```html
Light is on!
```
# ?? 7 ?? ???????????????
## 7.1 ????????
**1. ??????**
??????????????????????????????????????????????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/8e8ba824-7a9e-4934-a212-e6a41dcc1602.jpg)
**2. ?????**
??????????????????????????????????????????????????????????????????????Adapter??????????????????Adaptee???????????????????§Ú??????????????????????§µ?Adapter ??????? Target ?? Adaptee ?????????????? Adaptee ??????????????? Adapter ????????????? Target ?????????? Client ?????????????? Target ???????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/253bd869-ea48-4092-9aed-6906ccb2f3b0.jpg)
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/a797959a-0ed5-475b-8d97-df157c672019.jpg)
**3. ????????**
??????Duck????????Turkey????Duck ?? quack() ???????? Turkey ??? gobble() ?????????????? Turkey ??? Duck ?? quack() ??????
**4. ??????????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/1a511c76-bb6b-40ab-b8aa-39eeb619d673.jpg)
**5. ???????**
```java
public interface Duck {
public void quack();
public void fly();
}
```
```java
public interface Turkey {
public void gobble();
public void fly();
}
```
```java
public class WildTurkey implements Turkey{
@Override
public void gobble() {
System.out.println("gobble!");
}
@Override
public void fly() {
System.out.println("fly!");
}
}
```
```java
public class TurkeyAdapter implements Duck{
Turkey turkey;
public TurkeyAdapter(Turkey turkey) {
this.turkey = turkey;
}
@Override
public void quack() {
turkey.gobble();
}
@Override
public void fly() {
turkey.fly();
}
}
```
```java
public class DuckTestDrive {
public static void main(String[] args) {
Turkey turkey = new WildTurkey();
Duck duck = new TurkeyAdapter(turkey);
duck.quack();
duck.fly();
}
}
```
???§ß??
```html
gobble!
fly!
```
## 7.2 ?????
**1. ??????**
???????????????????????????§Ö??????????????????????????????????????¨¢?
**2. ?????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/78f2314e-2643-41df-8f3d-b7e28294094b.jpg)
**3. ????????**
???????????????????????§Û???????????????????§Ó???????????§»????????¨¹???????????????????????????????????????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/106f5585-b2e7-4718-be5d-3b322d1ef42a.jpg)
**4. ??????????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/25387681-89f8-4365-a2fa-83b86449ee84.jpg)
**5. ??????**
**?????????**????????????????????????????????????????????????????????????
# ?? 8 ?? ??Ùã????
**1. ??????**
??????????§Ø??????????????????§»?????????????§³?
??Ùã????????????????????????????????????????§Ö??§»???ÒÂ
**2. ?????**
??Ùã?? templateMethod() ?????????????????? primitiveOperation1() ?? primitiveOperation2() ??????§Ö????? primitiveOperation1() ?? primitiveOperation2() ???????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/ed62f400-192c-4185-899b-187958201f0c.jpg)
**3. ????????**
?ÓÇ????õÂ?????????????????§»??????§Ö??????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/d8f873fc-00bc-41ee-a87c-c1b4c0172844.png)
**4. ??????????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/aa20c123-b6b5-432a-83d3-45dc39172192.jpg)
**5. ??????**
**?????????**??????????´Â????????????????????´Â??????????????????????????????????????????????????????????????????????????????Ùã?????????????§Ú???????????????????????
**6. ????**
?????hock?????§»????????????§á??§á????????????????????????????????????????Ùã?? templteMethod() ?§µ??????????????????????????????????????
**7. ???????**
```java
public abstract class CaffeineBeverage {
final void prepareRecipe(){
boilWater();
brew();
pourInCup();
addCondiments();
}
abstract void brew();
abstract void addCondiments();
void boilWater(){
System.out.println("boilWater");
}
void pourInCup(){
System.out.println("pourInCup");
}
}
```
```java
public class Coffee extends CaffeineBeverage{
@Override
void brew() {
System.out.println("Coffee.brew");
}
@Override
void addCondiments() {
System.out.println("Coffee.addCondiments");
}
}
```
```java
public class Tea extends CaffeineBeverage{
@Override
void brew() {
System.out.println("Tea.brew");
}
@Override
void addCondiments() {
System.out.println("Tea.addCondiments");
}
}
```
```java
public class CaffeineBeverageTestDrive {
public static void main(String[] args) {
CaffeineBeverage caffeineBeverage = new Coffee();
caffeineBeverage.prepareRecipe();
System.out.println("-----------");
caffeineBeverage = new Tea();
caffeineBeverage.prepareRecipe();
}
}
```
???§ß??
```html
boilWater
Coffee.brew
pourInCup
Coffee.addCondiments
-----------
boilWater
Tea.brew
pourInCup
Tea.addCondiments
```
# ?? 9 ?? ?????????????
## 9.1 ????????
**1. ??????**
?????????????????????§Ö????????????????????????????????
**2. ?????**
?????????????????????????????????????????????????????????????????????????????????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/439deca7-fed0-4c89-87e5-7088d10f1fdb.jpg)
**3. ???????**
```java
public class Aggregate {
private int[] items;
public Aggregate() {
items = new int[10];
for (int i = 0; i < items.length; i++) {
items[i] = i;
}
}
public Iterator createIterator() {
return new ConcreteIterator(items);
}
}
```
```java
public interface Iterator {
boolean hasNext();
int next();
}
```
```java
public class ConcreteIterator implements Iterator {
private int[] items;
private int position = 0;
public ConcreteIterator(int[] items) {
this.items = items;
}
@Override
public boolean hasNext() {
return position < items.length;
}
@Override
public int next() {
return items[position++];
}
}
```
```java
public class Client {
public static void main(String[] args) {
Aggregate aggregate = new Aggregate();
Iterator iterator = aggregate.createIterator();
while(iterator.hasNext()){
System.out.println(iterator.next());
}
}
}
```
???§ß??
```html
0
1
2
3
4
5
6
7
8
9
```
## 9.2 Java ??????????
**1. ?????**
Java ????????? Iterator ????????? Java ??????????????????? Iterable ????????????? iterator() ??????????? Iterator ??????? Java ??????????????????????????? foreach ????????????????§Ö????????
**2. ???????**
```java
import java.util.Iterator;
public class Aggregate implements Iterable<Integer>{
private int[] items;
public Aggregate() {
items = new int[10];
for (int i = 0; i < items.length; i++) {
items[i] = i;
}
}
@Override
public Iterator<Integer> iterator() {
return new ConcreteIterator(items);
}
}
```
```java
import java.util.Iterator;
public class ConcreteIterator implements Iterator<Integer> {
private int[] items;
private int position = 0;
public ConcreteIterator(int[] items) {
this.items = items;
}
@Override
public boolean hasNext() {
return position < items.length;
}
@Override
public Integer next() {
return items[position++];
}
}
```
```java
public class Client {
public static void main(String[] args) {
Aggregate aggregate = new Aggregate();
for (int item : aggregate) {
System.out.println(item);
}
}
}
```
## 9.3 ?????
**1. ??????**
????????????????????????
**2. ??????**
???????????????¦Í???????????? / ???????¦Í???
??????????????????????????????????????
**3. ?????**
????????Composite???????????????Component???????????????¦Ë?????¦Í????§Þ???????????????????????????????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/f99c019e-7e91-4c2e-b94d-b031c402dcb5.jpg)
**4. ???????**
```java
public abstract class Component {
protected String name;
public Component(String name) {
this.name = name;
}
abstract public void addChild(Component component);
public void print() {
print(0);
}
abstract protected void print(int level);
}
```
```java
public class Leaf extends Component {
public Leaf(String name) {
super(name);
}
@Override
public void addChild(Component component) {
throw new UnsupportedOperationException(); // ???????????????????? , ??????????????????????????
}
@Override
protected void print(int level) {
for (int i = 0; i < level; i++) {
System.out.print("--");
}
System.out.println("left:" + name);
}
}
```
```java
import java.util.ArrayList;
import java.util.List;
public class Composite extends Component {
private List<Component> childs;
public Composite(String name) {
super(name);
childs = new ArrayList<>();
}
@Override
public void addChild(Component component) {
childs.add(component);
}
@Override
protected void print(int level) {
for (int i = 0; i < level; i++) {
System.out.print("--");
}
System.out.println("Composite:" + name);
for (Component component : childs) {
component.print(level + 1);
}
}
}
```
```java
public class Client {
public static void main(String[] args) {
Composite root = new Composite("root");
Component node1 = new Leaf("1");
Component node2 = new Composite("2");
Component node3 = new Leaf("3");
root.addChild(node1);
root.addChild(node2);
root.addChild(node3);
Component node21 = new Leaf("21");
Component node22 = new Composite("22");
node2.addChild(node21);
node2.addChild(node22);
Component node221 = new Leaf("221");
node22.addChild(node221);
root.print();
}
}
```
???§ß??
```html
Composite:root
--left:1
--Composite:2
----left:21
----Composite:22
------left:221
--left:3
```
# ?? 10 ?? ????
**1. ??????**
?????????????????????????????????????????????????????
???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????íà????????????????????????????????????????????????§á???????????????????????§Ö???????????????????????????????????????????????????????????????????????
**2. ?????**
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/c28fd93a-0d55-4a19-810f-72652feee00d.jpg)
**3. ????????**
?????????§Ø????????????????????§Ó???????????????????????????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/f7d880c9-740a-4a16-ac6d-be502281b4b2.jpg)
**4. ?????????**
???????????????????????—¨?§Ø??????????????????????§Ó????????????????????????????????????????§Ö???????????????????????????????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/62ebbb63-8fd7-4488-a866-76a9dc911662.png)
**5. ???????????????**
??????????????????—¨???????????????????§Ú???????????????????????????????????¦Í????????
**6. ???????**
```java
public interface State {
/**
* ???25 ???
*/
void insertQuarter();
/**
* ???25 ???
*/
void ejectQuarter();
/**
* ???????
*/
void turnCrank();
/**
* ???????
*/
void dispense();
}
```
```java
public class HasQuarterState implements State{
private GumballMachine gumballMachine;
public HasQuarterState(GumballMachine gumballMachine){
this.gumballMachine = gumballMachine;
}
@Override
public void insertQuarter() {
System.out.println("You can't insert another quarter");
}
@Override
public void ejectQuarter() {
System.out.println("Quarter returned");
gumballMachine.setState(gumballMachine.getNoQuarterState());
}
@Override
public void turnCrank() {
System.out.println("You turned...");
gumballMachine.setState(gumballMachine.getSoldState());
}
@Override
public void dispense() {
System.out.println("No gumball dispensed");
}
}
```
```java
public class NoQuarterState implements State {
GumballMachine gumballMachine;
public NoQuarterState(GumballMachine gumballMachine) {
this.gumballMachine = gumballMachine;
}
@Override
public void insertQuarter() {
System.out.println("You insert a quarter");
gumballMachine.setState(gumballMachine.getHasQuarterState());
}
@Override
public void ejectQuarter() {
System.out.println("You haven't insert a quarter");
}
@Override
public void turnCrank() {
System.out.println("You turned, but there's no quarter");
}
@Override
public void dispense() {
System.out.println("You need to pay first");
}
}
```
```java
public class SoldOutState implements State {
GumballMachine gumballMachine;
public SoldOutState(GumballMachine gumballMachine) {
this.gumballMachine = gumballMachine;
}
@Override
public void insertQuarter() {
System.out.println("You can't insert a quarter, the machine is sold out");
}
@Override
public void ejectQuarter() {
System.out.println("You can't eject, you haven't inserted a quarter yet");
}
@Override
public void turnCrank() {
System.out.println("You turned, but there are no gumballs");
}
@Override
public void dispense() {
System.out.println("No gumball dispensed");
}
}
```
```java
public class SoldState implements State {
GumballMachine gumballMachine;
public SoldState(GumballMachine gumballMachine) {
this.gumballMachine = gumballMachine;
}
@Override
public void insertQuarter() {
System.out.println("Please wait, we're already giving you a gumball");
}
@Override
public void ejectQuarter() {
System.out.println("Sorry, you already turned the crank");
}
@Override
public void turnCrank() {
System.out.println("Turning twice doesn't get you another gumball!");
}
@Override
public void dispense() {
gumballMachine.releaseBall();
if(gumballMachine.getCount()>0){
gumballMachine.setState(gumballMachine.getNoQuarterState());
} else{
System.out.println("Oops, out of gumballs");
gumballMachine.setState(gumballMachine.getSoldOutState());
}
}
}
```
```java
public class GumballMachine {
private State soldOutState;
private State noQuarterState;
private State hasQuarterState;
private State soldState;
private State state;
private int count = 0;
public GumballMachine(int numberGumballs) {
count = numberGumballs;
soldOutState = new SoldOutState(this);
noQuarterState = new NoQuarterState(this);
hasQuarterState = new HasQuarterState(this);
soldState = new SoldState(this);
if (numberGumballs > 0) {
state = noQuarterState;
} else {
state = soldOutState;
}
}
public void insertQuarter() {
state.insertQuarter();
}
public void ejectQuarter() {
state.ejectQuarter();
}
public void turnCrank() {
state.turnCrank();
state.dispense();
}
public void setState(State state) {
this.state = state;
}
public void releaseBall() {
System.out.println("A gumball comes rolling out the slot...");
if (count != 0) {
count -= 1;
}
}
public State getSoldOutState() {
return soldOutState;
}
public State getNoQuarterState() {
return noQuarterState;
}
public State getHasQuarterState() {
return hasQuarterState;
}
public State getSoldState() {
return soldState;
}
public int getCount() {
return count;
}
}
```
```java
public class GumballMachineTestDrive {
public static void main(String[] args) {
GumballMachine gumballMachine = new GumballMachine(5);
gumballMachine.insertQuarter();
gumballMachine.turnCrank();
gumballMachine.insertQuarter();
gumballMachine.ejectQuarter();
gumballMachine.turnCrank();
gumballMachine.insertQuarter();
gumballMachine.turnCrank();
gumballMachine.insertQuarter();
gumballMachine.turnCrank();
gumballMachine.ejectQuarter();
gumballMachine.insertQuarter();
gumballMachine.insertQuarter();
gumballMachine.turnCrank();
gumballMachine.insertQuarter();
gumballMachine.turnCrank();
gumballMachine.insertQuarter();
gumballMachine.turnCrank();
}
}
```
???§ß??
```html
You insert a quarter
You turned...
A gumball comes rolling out the slot...
You insert a quarter
Quarter returned
You turned, but there's no quarter
You need to pay first
You insert a quarter
You turned...
A gumball comes rolling out the slot...
You insert a quarter
You turned...
A gumball comes rolling out the slot...
You haven't insert a quarter
You insert a quarter
You can't insert another quarter
You turned...
A gumball comes rolling out the slot...
You insert a quarter
You turned...
A gumball comes rolling out the slot...
Oops, out of gumballs
You can't insert a quarter, the machine is sold out
You turned, but there are no gumballs
No gumball dispensed
```
# ?? 11 ?? ?????? // TODO
# ?? 12 ?? ??????
## 12.1 MVC
### 12.1.1 ??? MVC
???????????????????????????????????????????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/4f67611d-492f-4958-9fa0-4948010e345f.jpg)
### 12.1.2 Web ?§Ö? MVC
????????¨´????????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/1dd56e61-2970-4d27-97c2-6e81cee86978.jpg)
# ?? 13 ?? ?????????
???‰Ø??? **??** ??????? **????** ????? **???????**??
?????????????????????????????????????????????????????????????????????????????????????
???????????????????????????????????????????ÖÎ??????§»?????????
??????
![](https://github.com/CyC2018/InterviewNotes/blob/master/pics/524a237c-ffd7-426f-99c2-929a6bf4c847.jpg)
# ?? 14 ?? ?????? // TODO
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