抽象工厂模式

void draw();

}

步骤 2

创建实现接口的实体类。

Rectangle.java

public class Rectangle implements Shape {

@Override

public void draw() {

System.out.println("Inside Rectangle::draw() method.");

}

}

Square.java

public class Square implements Shape {

@Override

public void draw() {

System.out.println("Inside Square::draw() method.");

}

}

Circle.java

public class Circle implements Shape {

@Override

public void draw() {

System.out.println("Inside Circle::draw() method.");

}

}

步骤 3

为颜色创建一个接口。

Color.java

public interface Color {

void fill();

}

步骤 4

创建实现接口的实体类。

Red.java

public class Red implements Color {

@Override

public void fill() {

System.out.println("Inside Red::fille() method.");

}

}

Green.java

public class Green implements Color {

@Override

public void fill() {

System.out.println("Inside Green::fille() method.");

}

}

Blue.java

public class Blue implements Color {

@Override

public void fill() {

System.out.println("Inside Blue::fille() method.");

}

}

步骤 5

为 Color 和 Shape 对象创建抽象类来获取工厂。

AbstractFactory.java

public abstract class AbstractFactory {

abstract Shape getSh

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ape(String shape);

abstract Color getColor(String color);

}

步骤 6

创建扩展了 AbstractFactory 的工厂类，基于给定的信息生成实体类的对象。

ShapeFactory.java

public class ShapeFactory extends AbstractFactory {

@Override

Shape getShape(String shape) {

if (shape == null) {

return null;

}

shape = shape.toLowerCase();

switch (shape) {

case "circle":

return new Circle();

case "rectangle":

return new Rectangle();

case "square":

return new Square();

default:

return null;

}

}

@Override

Color getColor(String color) {

return null;

}

}

ColorFactory.java

public class ColorFactory extends AbstractFactory {

@Override

Shape getShape(String shape) {

return null;

}

@Override

Color getColor(String color) {

if (color == null) {

return null;

}

color = color.toLowerCase();

switch (color) {

case "red":

return new Red();

case "blue":

return new Blue();

case "green":

return new Green();

default:

return null;

}

}

}

步骤 7

创建一个工厂创造器/生成器类，通过传递形状或颜色信息来获取工厂。

FactoryProducer.java

public class FactoryProducer {

public static AbstractFactory getFactory(String choice) {

if (choice == null) {

return null;

}

if ("shape".equalsIgnoreCase(choice)) {

return new ShapeFactory();

} else if ("color".equalsIgnoreCase(choice)) {

return new ColorFactory();

} else {

return null;

}

}

}

步骤 8

使用 FactoryProducer 来获取 AbstractFactory，通过传递类型信息来获取实体类的对象。

AbstractFactoryPatternDemo.java