相同问题go语言与php的实现对比

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) }

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