Golang工厂模式创建对象详解

type Shape interface {
    Draw() string
}

type Circle struct{}

func (c *Circle) Draw() string {
    return "Drawing a circle"
}

type Rectangle struct{}

func (r *Rectangle) Draw() string {
    return "Drawing a rectangle"
}

func NewShape(shapeType string) Shape {
    switch shapeType {
    case "circle":
        return &Circle{}
    case "rectangle":
        return &Rectangle{}
    default:
        return nil
    }
}

func main() {
    shape1 := NewShape("circle")
    shape2 := NewShape("rectangle")

    if shape1 != nil {
        fmt.Println(shape1.Draw())
    }

    if shape2 != nil {
        fmt.Println(shape2.Draw())
    }
}

Drawing a circle
Drawing a rectangle