一、面向对象


php:

classRectangle{private$width;private$height;private$color;publicfunction__construct($width,$height,$color){$this->width=$width;$this->height=$height;$this->color=$color;}publicfunctionsetColor($color){$this->color=$color;}publicfunctiongetColor(){return$this->color;}publicfunctionarea(){return$this->width*$this->height;}}$r1=newRectangle(12,2,"白色");$r2=newRectangle(9,4,"蓝色");echo"Areaofr1is".$r1->area()."\n";echo"Areaofr2is".$r2->area()."\n";echo"Colorofr2is".$r2->getColor()."\n";echo"setnewcolor\n";$r2->setColor("绿色");echo"Colorofr2is".$r2->getColor()."\n";


go:

packagemainimport"fmt"typeRectanglestruct{width,heightfloat64colorstring}//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(colorstring){r.color=color}func(rRectangle)area()float64{returnr.width*r.height}funcmain(){r1:=Rectangle{12,2,"白色"}r2:=Rectangle{9,4,"蓝色"}fmt.Println("Areaofr1is:",r1.area())fmt.Println("Areaofr2is:",r2.area())fmt.Println("Colorofr2is:",r2.color)fmt.Println("setnewcolor")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("Colorofr2is:",r2.color)}