Replica Watches: 生成器设计模式（学习笔记）

2021-07-27

生成器设计模式（学习笔记）

　　1. 意图

　　5. 效果

package builder.builders;import builder.cars.CarType;import builder.cars.Manual;import builder.components.Engine;import builder.components.GPSNavigator;import builder.components.Transmission;import builder.components.TripComputer;/** * @author GaoMing * @date 2021/7/18 - 10:03 * Unlike other creational patterns, Builder can construct unrelated products, * which don't have the common interface. * In this case we build a user manual for a car, using the same steps as we * built a car. This allows to produce manuals for specific car models, * configured with different features. */public class CarManualBuilder implements Builder{ private CarType type; private int seats; private Engine engine; private Transmission transmission; private TripComputer tripComputer; private GPSNavigator gpsNavigator; @Override public void setCarType(CarType type) {  this.type = type; } @Override public void setSeats(int seats) {  this.seats = seats; } @Override public void setEngine(Engine engine) {  this.engine = engine; } @Override public void setTransmission(Transmission transmission) {  this.transmission = transmission; } @Override public void setTripComputer(TripComputer tripComputer) {  this.tripComputer = tripComputer; } @Override public void setGPSNavigator(GPSNavigator gpsNavigator) {  this.gpsNavigator = gpsNavigator; } public Manual getResult() {  return new Manual(type, seats, engine, transmission, tripComputer, gpsNavigator); }}

　　Cars

　　cars/Car.java: 汽车产品

package builder.cars;import builder.components.Engine;import builder.components.GPSNavigator;import builder.components.Transmission;import builder.components.TripComputer;/** * @author GaoMing * @date 2021/7/18 - 9:48 * Car is a product class */public class Car { private final CarType carType; private final int seats; private final Engine engine; private final Transmission transmission; private final TripComputer tripComputer; private final GPSNavigator gpsNavigator; private double fuel = 0; public Car(CarType carType, int seats, Engine engine, Transmission transmission,    TripComputer tripComputer, GPSNavigator gpsNavigator) {  this.carType = carType;  this.seats = seats;  this.engine = engine;  this.transmission = transmission;  this.tripComputer = tripComputer;  if (this.tripComputer != null) {   this.tripComputer.setCar(this);  }  this.gpsNavigator = gpsNavigator; } public CarType getCarType() {  return carType; } public double getFuel() {  return fuel; } public void setFuel(double fuel) {  this.fuel = fuel; } public int getSeats() {  return seats; } public Engine getEngine() {  return engine; } public Transmission getTransmission() {  return transmission; } public TripComputer getTripComputer() {  return tripComputer; } public GPSNavigator getGpsNavigator() {  return gpsNavigator; }}

　　cars/Manual.java: 手册产品

package builder.cars;import builder.components.Engine;import builder.components.GPSNavigator;import builder.components.Transmission;import builder.components.TripComputer;/** * @author GaoMing * @date 2021/7/18 - 9:56 * Car manual is another product. Note that it does not have the same ancestor as a Car. They are not related */public class Manual { private final CarType carType; private final int seats; private final Engine engine; private final Transmission transmission; private final TripComputer tripComputer; private final GPSNavigator gpsNavigator; public Manual(CarType carType, int seats, Engine engine, Transmission transmission,     TripComputer tripComputer, GPSNavigator gpsNavigator) {  this.carType = carType;  this.seats = seats;  this.engine = engine;  this.transmission = transmission;  this.tripComputer = tripComputer;  this.gpsNavigator = gpsNavigator; } public String print() {  String info = "";  info += "Type of car: " + carType + "\n";  info += "Count of seats: " + seats + "\n";  info += "Engine: volume - " + engine.getVolume() + "; mileage - " + engine.getMileage() + "\n";  info += "Transmission: " + transmission + "\n";  if (this.tripComputer != null) {   info += "Trip Computer: Functional" + "\n";  } else {   info += "Trip Computer: N/A" + "\n";  }  if (this.gpsNavigator != null) {   info += "GPS Navigator: Functional" + "\n";  } else {   info += "GPS Navigator: N/A" + "\n";  }  return info; }}

　　cars/CarType.java

package builder.cars;/** * @author GaoMing * @date 2021/7/18 - 9:51 */public enum CarType { CITY_CAR, SPORTS_CAR, SUV}

　　Components

　　components/Engine.java: 产品特征 1

package builder.components;/** * @author GaoMing * @date 2021/7/18 - 9:27 * feature of a car */public class Engine { private final double volume; private double mileage; private boolean started; public Engine(double volume, double mileage){  this.volume = volume;  this.mileage = mileage; } public void on(){  started = true; } public void off(){  started = false; } public boolean isStarted(){  return started; } public void go(double mileage){  if(started){   this.mileage += mileage;  }else {   System.err.println("Cannot go(), you must start engine first!");  } } public double getVolume(){  return volume; } public double getMileage(){  return mileage; }}

　　components/GPSNavigator.java: 产品特征 2

package builder.components;/** * @author GaoMing * @date 2021/7/18 - 9:33 * Another feature of a car */public class GPSNavigator { private String route; public GPSNavigator(){  this.route = "221b, Baker Street, London to Scotland Yard, 8-10 Broadway, London"; } public GPSNavigator(String manualRoute){  this.route = manualRoute; } public String getRoute(){  return route; }}

　　components/Transmission.java: 产品特征 3

package builder.components;/** * @author GaoMing * @date 2021/7/18 - 9:35 * Another feature of a car */public enum Transmission { SINGLE_SPEED, MANUAL, AUTOMATIC, SEMI_AUTOMATIC}

　　components/TripComputer.java: 产品特征 4　　

package builder.components;import builder.cars.Car;/** * @author GaoMing * @date 2021/7/18 - 9:48 * Another feature of a car */public class TripComputer { private Car car; public void setCar(Car car){  this.car = car; } public void showFuellevel(){  System.out.println("Fuel level: " + car.getFuel()); } public void showStatus(){  if(this.car.getEngine().isStarted()){   System.out.println("Car is started");  }else {   System.out.println("Car isn't started");  } }}

　　Director

　　director/Director.java: 主管控制生成器

package builder.director;import builder.cars.CarType;import builder.components.Engine;import builder.components.GPSNavigator;import builder.components.Transmission;import builder.components.TripComputer;import builder.builders.Builder;/** * @author GaoMing * @date 2021/7/18 - 10:08 * Director defines the order of building steps. It works with a builder object * through common Builder interface. Therefore it may not know what product is * being built. */public class Director { public void constructSportsCar(Builder builder) {  builder.setCarType(CarType.SPORTS_CAR);  builder.setSeats(2);  builder.setEngine(new Engine(3.0, 0));  builder.setTransmission(Transmission.SEMI_AUTOMATIC);  builder.setTripComputer(new TripComputer());  builder.setGPSNavigator(new GPSNavigator()); } public void constructCityCar(Builder builder) {  builder.setCarType(CarType.CITY_CAR);  builder.setSeats(2);  builder.setEngine(new Engine(1.2, 0));  builder.setTransmission(Transmission.AUTOMATIC);  builder.setTripComputer(new TripComputer(......原文转载：http://www.shaoqun.com/a/898405.html
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1.意图　　5.效果packagebuilder.builders;importbuilder.cars.CarType;importbuilder.cars.Manual;importbuilder.components.Engine;importbuilder.components.GPSNavigator;importbuilder.components.Transmission;impor
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