相同问题go语言与php的实现对比

sdfsdnfslk

　　一、面向对象
　　

　　php:
class Rectangle
{
    private $width;
    private $height;
    private $color;
    public function __construct($width, $height, $color)
    {
        $this->width  = $width;
        $this->height = $height;
        $this->color  = $color;
    }
    public function setColor($color)
    {
        $this->color = $color;
    }
    public function getColor()
    {
        return $this->color;
    }
    public function area()
    {
        return $this->width * $this->height;
    }

}
$r1 = new Rectangle(12, 2, "白色");
$r2 = new Rectangle(9, 4, "蓝色");
echo "Area of r1 is ". $r1->area()."\n";
echo "Area of r2 is ". $r2->area()."\n";
echo "Color of r2 is ". $r2->getColor()."\n";
echo "set new color\n";
$r2->setColor("绿色");
echo "Color of r2 is ". $r2->getColor()."\n";　　

　　go:
package main
import "fmt"
type Rectangle struct {
width, height float64
color         string
}
// 如果声明接收者为指定，当使用T类型来调用时，go会自动转换为*T，太TM聪明了
func (r *Rectangle) SetColor(color string) {
r.color = color
}
func (r Rectangle) area() float64 {
return r.width * r.height
}
func main() {
r1 := Rectangle{12, 2, "白色"}
r2 := Rectangle{9, 4, "蓝色"}
fmt.Println("Area of r1 is: ", r1.area())
fmt.Println("Area of r2 is: ", r2.area())
fmt.Println("Color of r2 is: ", r2.color)
fmt.Println("set new color")
r2.SetColor("绿色") // 等价于(&r2).SetColor("绿色"),这里r2不需要传地址，当然，传地址也不错，只是go会自动帮助转换，没有必要
fmt.Println("Color of r2 is: ", r2.color)
}