Golang – 常用设计 Factory Pattern

Factory Pattern 就是根据传入的param创建一个相对应的object

  1. 定义好基础单位和所有单位的样式
const (
	CircleType   = ShapeType("circle")
	TriangleType = ShapeType("triangle")
)

type ShapeType string

2. 定义好Factory和interface标准

type Shape interface {
	Draw() string
}

func NewShape(newShapeType ShapeType) Shape {
	switch newShapeType {
	case CircleType:
		return &Circle{}
	case TriangleType:
		return &Triangle{}
	default:
		return nil
	}
}

3. 定义好Circle Object

type Circle struct {
}

func (this *Circle) Draw() string {
	return "this is a circle"
}

4. 定义好Triangle Object

type Triangle struct {
}

func (this *Triangle) Draw() string {
	return "this is a triangle"
}

5. 使用案例

func main() {
	newShape := NewShape(TriangleType)
	if newShape != nil {
		checkType := newShape.Draw()
		fmt.Println(checkType)
	}
}

输出结果：

this is a triangle

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