设计模式实现：工厂方法与抽象工厂的应用实例-蒲公英云

设计模式实现：工厂方法与抽象工厂的应用实例

原创你的名字 2024-12-12 13:33 96阅读 0赞

工厂方法（Factory Method）和抽象工厂（Abstract Factory）是面向对象编程中两种常用的工厂模式。

工厂方法（Factory Method）实例：

简单工厂模式：

// 工厂接口
public interface ShapeFactory {
    Shape createShape(String shapeType);
}
// 简单工厂实现
class SimpleShapeFactory implements ShapeFactory {
    @Override
    public Shape createShape(String shapeType) {
        if (shapeType.equalsIgnoreCase("Circle")) {
            return new Circle();
        } else if (shapeType.equalsIgnoreCase("Rectangle")) {
            return new Rectangle();
        }
        return null; //非法形状类型
    }
}
// 使用工厂创建形状实例
public class ShapeDemo {
    public static void main(String[] args) {
        ShapeFactory shapeFactory = new SimpleShapeFactory();
        Shape circle = shapeFactory.createShape("Circle");
        if (circle != null) {
            System.out.println("Created Circle: " + circle);
        }
        Shape rectangle = shapeFactory.createShape("Rectangle");
        if (rectangle != null) {
            System.out.println("Created Rectangle: " + rectangle);
        }
    }

工厂方法的实现，可能在一个具体的类中：
```java
// 具体工厂类
class CircleFactory extends ShapeFactory {
@Override
public Shape createShape(String shapeType) {
```
 if (shapeType.equalsIgnoreCase("Circle")) {
     return new Circle();
 }
 return null; //非法形状类型
```
}
}

// 使用工厂创建具体形状实例
public class ShapeDemo {
public static void main(String[] args) {
ShapeFactory shapeFactory = new CircleFactory();

    Shape circle = shapeFactory.createShape("Circle");
    if (circle != null) {
        System.out.println("Created Circle: " + circle);
    }
    // 如果需要创建矩形，可以使用相同工厂
    Shape rectangle = shapeFactory.createShape("Rectangle");
    if (rectangle != null) {
        System.out.println("Created Rectangle: " + rectangle);
    }
}

}


**抽象工厂（Abstract Factory）实例：**
1. **多个具体工厂类的集合：**
```java
// 抽象工厂接口
public interface ShapeFactoryInterface {
    Shape createShape(String shapeType);
}
// 抽象工厂实现
abstract class AbstractShapeFactory implements ShapeFactoryInterface {
    @Override
    public Shape createShape(String shapeType) {
        // 实现不同形状的具体创建逻辑
        if (shapeType.equalsIgnoreCase("Circle")) {
            return new Circle();
        } else if (shapeType.equalsIgnoreCase("Rectangle")) {
            return new Rectangle();
        }
        return null; //非法形状类型
    }
}

使用抽象工厂创建具体形状实例：

// 使用抽象工厂创建具体形状实例
public class ShapeDemo {
 public static void main(String[] args) {
     ShapeFactoryInterface shapeFactory = new AbstractShapeFactory();
     Shape circle = shapeFactory.createShape("Circle");
     if (circle != null) {
         System.out.println("Created Circle: " + circle);
     }
     // 创建矩形形状，逻辑同上
     Shape rectangle = shapeFactory.createShape("Rectangle");
     if (rectangle != null) {
         System.out.println("Created Rectangle: " + rectangle);
     }
 }
}