抽象工厂模式（Abstract Factory Pattern）

最新推荐文章于 2022-05-10 10:24:29 发布

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本文深入解析抽象工厂模式，展示如何通过此模式创建一系列相关或相互依赖的对象，而无需指定它们具体的类。通过示例代码，详细说明了抽象工厂、具体工厂、产品接口及具体产品类的实现方式。

接口

package DesignPattern.AbstractFactoryPattern;
public interface Shape {
    void draw();
}

package DesignPattern.AbstractFactoryPattern;
public interface Color {
    void fill();
}

具体实现类

package DesignPattern.AbstractFactoryPattern;

public class Circle implements Shape{

    @Override
    public void draw() {
        System.out.println("Inside Circle::draw() method.");
    }
}

package DesignPattern.AbstractFactoryPattern;

public class Rectangle implements Shape {

    @Override
    public void draw() {
        System.out.println("Inside Rectangle::draw() method.");
    }
}

package DesignPattern.AbstractFactoryPattern;

public class Square implements Shape {

    @Override
    public void draw() {
        System.out.println("Inside Square::draw() method.");
    }
}

package DesignPattern.AbstractFactoryPattern;

public class Blue implements Color {

    @Override
    public void fill() {
        System.out.println("Inside Blue::fill() method.");
    }
}

package DesignPattern.AbstractFactoryPattern;

public class Green implements Color {

    @Override
    public void fill() {
        System.out.println("Inside Green::fill() method.");
    }
}

package DesignPattern.AbstractFactoryPattern;

public class Red implements Color {

    @Override
    public void fill() {
        System.out.println("Inside Red::fill() method.");
    }
}

抽象工厂类

package DesignPattern.AbstractFactoryPattern;

public abstract class AbstractFactory {

    public abstract Color getColor(String color);

    public abstract Shape getShape(String shape);
}

具体工厂类

package DesignPattern.AbstractFactoryPattern;

public class ShapeFactory extends AbstractFactory {

    @Override
    public Shape getShape(String shapeType) {
        if(shapeType == null){
            return null;
        }
        if(shapeType.equalsIgnoreCase("CIRCLE")){
            return new Circle();
        } else if(shapeType.equalsIgnoreCase("RECTANGLE")){
            return new Rectangle();
        } else if(shapeType.equalsIgnoreCase("SQUARE")){
            return new Square();
        }
        return null;
    }

    @Override
    public Color getColor(String color) {
        return null;
    }
}

package DesignPattern.AbstractFactoryPattern;

public class ColorFactory extends AbstractFactory {

    @Override
    public Shape getShape(String shape) {
        return null;
    }

    @Override
    public Color getColor(String color) {
        if(color == null){
            return null;
        }
        if(color.equalsIgnoreCase("RED")){
            return new Red();
        } else if(color.equalsIgnoreCase("GREEN")){
            return new Green();
        } else if(color.equalsIgnoreCase("BLUE")){
            return new Blue();
        }
        return null;
    }
}

工厂生产类

package DesignPattern.AbstractFactoryPattern;

public class FactoryProducer {

    public static AbstractFactory getFactory(String choice) {
        if (choice.equalsIgnoreCase("SHAPE")) {
            return new ShapeFactory();
        } else if (choice.equalsIgnoreCase("COLOR")) {
            return new ColorFactory();
        }
        return null;
    }
}

客户端

package DesignPattern.AbstractFactoryPattern;

public class AbstractFactoryPatternDemo {

    public static void main(String[] args) {
        AbstractFactory shapeFactory = FactoryProducer.getFactory("SHAPE");
        Shape shape1 = shapeFactory.getShape("CIRCLE");
        shape1.draw();

        Shape shape2 = shapeFactory.getShape("Rectangle");
        shape2.draw();
        Shape shape3 = shapeFactory.getShape("SQUARE");
        shape3.draw();

        //获取颜色工厂
        AbstractFactory colorFactory = FactoryProducer.getFactory("COLOR");
        //获取颜色为 Red 的对象
        Color color1 = colorFactory.getColor("RED");
        //调用 Red 的 fill 方法
        color1.fill();
        //获取颜色为 Green 的对象
        Color color2 = colorFactory.getColor("Green");
        //调用 Green 的 fill 方法
        color2.fill();
        //获取颜色为 Blue 的对象
        Color color3 = colorFactory.getColor("BLUE");
        //调用 Blue 的 fill 方法
        color3.fill();
    }
}