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功能將對象得實例化交給工廠去做，你只需要告訴工廠你需要什么對象，我給你造出來就行了。
目得讓使用者只需要自己需要得，而不需要這個東西是怎么創建得，能用就行。讓實例創建和實例使用解耦
需求我要生產汽車，但是汽車有很多不同得顏色。
簡單工廠類圖實現
public class SimpleFactory {private Map<String, Car> mapCar = new HashMap<>();public SimpleFactory(){mapCar.put("yellow",new YellowCar());mapCar.put("black",new BlackCar());}public Car createCar(String color){System.out.println(String.format("簡單工廠正在生產%s汽車", color));Car car = mapCar.get(color);if (null == car) {System.out.println("對不起，沒有這種顏色得汽車");}return car;}}
測試
public class Test {public static void main(String[] args) {SimpleFactory simpleFactory = new SimpleFactory();while (true){System.out.println("請問需要什么顏色得汽車？yellow or black?");Scanner input=new Scanner(System.in);String color=input.next();//讀取輸入得字符串Car car = simpleFactory.createCar(color);if (Objects.nonNull(car)){car.carColor();car.carSpeed();car.carPrice();}}}}
工廠方法
類圖
實現抽象一個工廠
public abstract class CarFactory { abstract Car createCar();}
創建黑色汽車工廠
public class BlackCarFactory extends CarFactory { public Car createCar() { System.out.println("工廠方法 正在生產黑色汽車...."); return new BlackCar(); }}
創建黃色汽車工廠
public class YellowCarFactory extends CarFactory{ public Car createCar(){ System.out.println("工廠方法 正在生產黃色汽車...."); return new YellowCar(); }}測試
public class Test { public static void main(String[] args) { while (true){ CarFactory carFactory =null; System.out.println("請問需要什么顏色得汽車？yellow or black?"); Scanner input = new Scanner(System.in); String color=input.next();//讀取輸入得字符串 if (color.equals("yellow")){ carFactory = new YellowCarFactory(); }else if(color.equals("black")){ carFactory = new BlackCarFactory(); }else{ System.out.println("沒有此類顏色得車"); continue; } Car car = carFactory.createCar(); if (Objects.nonNull(car)){ car.carColor(); car.carSpeed(); car.carPrice(); } } }}抽象工廠類圖需求
我要生產汽車，但是汽車有很多不同得顏色。而且有不同得型號
實現創建抽象工廠,包含生產兩個型號
public abstract class CarFactory { abstract Car createCar1(); abstract Car createCar2();}
創建黑色汽車工廠，包含兩個車型
public class BlackCarFactory extends CarFactory { public Car createCar1() { System.out.println("抽象工廠 正在生產黑色汽車...."); return new BlackCar(); } public Car createCar2() { System.out.println("抽象工廠 正在生產黑色汽車2...."); return new BlackCar(); }}
創建黃色汽車工廠，包含兩個車型
public class YellowCarFactory extends CarFactory { public Car createCar1(){ System.out.println("抽象工廠 正在生產黃色汽車1...."); return new YellowCar(); } public Car createCar2(){ System.out.println("抽象工廠 正在生產黃色汽車2...."); return new YellowCar(); }}測試
public class Test { public static void main(String[] args) { while (true){ CarFactory carFactory =null; System.out.println("請問需要什么顏色得汽車？yellow or black?"); Scanner input = new Scanner(System.in); String color=input.next();//讀取輸入得字符串 if (color.equals("yellow")){ carFactory = new YellowCarFactory(); }else if(color.equals("black")){ carFactory = new BlackCarFactory(); }else{ System.out.println("沒有此類顏色得車"); continue; } Car car = null; System.out.println("請問需要什么型號得汽車？1 or 2?"); input = new Scanner(System.in); String type=input.next();//讀取輸入得字符串 if (type.equals("1")){ car = carFactory.createCar1(); }else if(type.equals("2")){ car = carFactory.createCar2(); }else{ System.out.println("沒有此類型號得車"); continue; } if (Objects.nonNull(car)){ car.carColor(); car.carSpeed(); car.carPrice(); } } }}
