设计模式--抽象工厂

任何可以产生对象的方法或者类都可以叫做工厂。

抽象工厂：一个超级工厂创建其他工厂

上图展示：

代码实现：

为形状创建一个接口

package com.dl.pattern.abstractFactory;

public interface Shape {
    public void drow();
}

创建实体类

package com.dl.pattern.abstractFactory;

public class Circle implements Shape {
    @Override
    public void drow() {
        System.out.println("画了一个圆");
    }
}

package com.dl.pattern.abstractFactory;

public class Rectangle implements Shape {
    @Override
    public void drow() {
        System.out.println("画了一个长方形");
    }
}

package com.dl.pattern.abstractFactory;

public class Square implements Shape{
    @Override
    public void drow() {
        System.out.println("画了一个正方形");
    }
}

创建颜色实体类

package com.dl.pattern.abstractFactory;

public interface Color {
    public void fill();
}

package com.dl.pattern.abstractFactory;

public class Blue implements Color {
    @Override
    public void fill() {
        System.out.println("填满蓝色");
    }
}

package com.dl.pattern.abstractFactory;

public class Green implements Color {
    @Override
    public void fill() {
        System.out.println("填满绿色");
    }
}

package com.dl.pattern.abstractFactory;

public class Red implements Color {
    @Override
    public void fill() {
        System.out.println("填满红色");
    }
}

为Color 和 Shape 对象创建抽象类来获取工厂。

public abstract class AbstractFactory {
    public abstract Color getColor(String color);
    public abstract Shape getShape(String shape);
}

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。

package com.dl.pattern.abstractFactory;

public class ColorFactory extends AbstractFactory{
    @Override
    public Color getColor(String color) {
        if (color==null){
            return null;
        }
        if (color.equalsIgnoreCase("red")){
            return new Red();
        }else if (color.equalsIgnoreCase("blue")){
            return new Blue();
        }else if (color.equalsIgnoreCase("green")){
            return new Green();
        }
        return null;
    }

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

package com.dl.pattern.abstractFactory;

/**
 * 创建一个工厂创造器，通过传递形状和颜色来获取工厂
 */
public class FactoryProduct {
    public static AbstractFactory getFactory(String choice){
        if (choice.equalsIgnoreCase("shape")){
            return new ShapeFactory();
        }else if (choice.equalsIgnoreCase("color")){
            return new ColorFactory();
        }
        return null;
    }
}

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。

/**
 * 创建一个工厂创造器，通过传递形状和颜色来获取工厂
 */
public class FactoryProduct {
    public static AbstractFactory getFactory(String choice){
        if (choice.equalsIgnoreCase("shape")){
            return new ShapeFactory();
        }else if (choice.equalsIgnoreCase("color")){
            return new ColorFactory();
        }
        return null;
    }
}

测试类

public class AbstractFactoryPatternTest {
    public static void main(String[] args) {
        //获取形状工厂
        AbstractFactory shareFactory = FactoryProduct.getFactory("shape");
        //获取形状为Circle的对象
        Shape circle = shareFactory.getShape("circle");
        circle.drow();
        Shape square = shareFactory.getShape("square");
        square.drow();
        Shape rectangle = shareFactory.getShape("rectangle");
        rectangle.drow();


        AbstractFactory colorFactory = FactoryProduct.getFactory("color");
        Color red = colorFactory.getColor("red");
        red.fill();
        Color blue = colorFactory.getColor("blue");
        blue.fill();
        Color green = colorFactory.getColor("green");
        green.fill();

    }
}