相同问题go语言与php的实现对比

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";

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)
}