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 mainimport "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)}