Go语言之“容器”
2017-12-29 本文已影响50人
夏夜星语
1.Struct体现的Go的优雅
1.代码如下，可细细体会struct的魅力
package main
import "fmt"
const(
WHITE = iota
BLACK
BLUE
RED
YELLOW
)
type Color byte
type Box struct{
width, height, depth float64
color Color
}
type BoxList []Box
func (b Box) Volume() float64 {
return b.width * b.height * b.depth
}
//change hthe parament, so here is a pointer
func (b *Box) SetColor(c Color) {
b.color = c
}
func (bl BoxList) BiggestColor() Color {
v := 0.00
k := Color(WHITE)
for _, b := range bl {
if bv := b.Volume(); bv > v {
v = bv
k = b.color
}
}
return k
}
func (bl BoxList) PaintItBlack() {
for i, _ := range bl {
bl[i].SetColor(BLACK)
}
}
func (c Color) String() string {
strings := []string {"WHITE", "BLACK", "BLUE", "RED", "YELLOW"}
return strings[c]
}
func main(){
boxes := BoxList{
Box{4, 4, 4, RED},
Box{10, 10, 1, YELLOW},
Box{1, 1, 20, BLACK},
Box{10, 10, 1, BLUE},
Box{10, 30, 1, WHITE},
Box{20, 20, 20, YELLOW},
}
fmt.Println("We have %d boxes in our set\n", len(boxes))
fmt.Println("The Volume of the first box is", boxes[0].Volume())
fmt.Println("The color of the last one is", boxes[len(boxes)-1].color)
fmt.Println("The biggest one is", boxes.BiggestColor().String())
fmt.Println("Let's paint them all black")
boxes.PaintItBlack()
fmt.Println("The color of the second one is", boxes[1].color.String())
fmt.Println("Obviously, now, the biggest one is", boxes.BiggestColor())
fmt.Println("I want to change the third color to YELLOW")
fmt.Println("Before changed, the color is", boxes[2].color.String())
boxes[2].SetColor(BLUE)
//直接打印color属性
fmt.Println("After changed, the color is", boxes[2].color)
//检测RED是否为数字3
fmt.Println(RED)
}
2.程序运行结果：
struct
