相同问题go语言与php的实现对比

一、面向对象

php:

class聽Rectangle
{
聽聽聽聽private聽$width;
聽聽聽聽private聽$height;
聽聽聽聽private聽$color;

聽聽聽聽public聽function聽__construct($width,聽$height,聽$color)
聽聽聽聽{
聽聽聽聽聽聽聽聽$this->width聽聽=聽$width;
聽聽聽聽聽聽聽聽$this->height聽=聽$height;
聽聽聽聽聽聽聽聽$this->color聽聽=聽$color;
聽聽聽聽}

聽聽聽聽public聽function聽setColor($color)
聽聽聽聽{
聽聽聽聽聽聽聽聽$this->color聽=聽$color;
聽聽聽聽}

聽聽聽聽public聽function聽getColor()
聽聽聽聽{
聽聽聽聽聽聽聽聽return聽$this->color;
聽聽聽聽}

聽聽聽聽public聽function聽area()
聽聽聽聽{
聽聽聽聽聽聽聽聽return聽$this->width聽*聽$this->height;
聽聽聽聽}


}

$r1聽=聽new聽Rectangle(12,聽2,聽"白色");
$r2聽=聽new聽Rectangle(9,聽4,聽"蓝色");
echo聽"Area聽of聽r1聽is聽".聽$r1->area()."\n";
echo聽"Area聽of聽r2聽is聽".聽$r2->area()."\n";

echo聽"Color聽of聽r2聽is聽".聽$r2->getColor()."\n";

echo聽"set聽new聽color\n";
$r2->setColor("绿色");
echo聽"Color聽of聽r2聽is聽".聽$r2->getColor()."\n";

go:

package聽main

import聽"fmt"

type聽Rectangle聽struct聽{
	width,聽height聽float64
	color聽聽聽聽聽聽聽聽聽string
}

//聽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聽(r聽*Rectangle)聽SetColor(color聽string)聽{
	r.color聽=聽color
}

func聽(r聽Rectangle)聽area()聽float64聽{
	return聽r.width聽*聽r.height
}

func聽main()聽{
	r1聽:=聽Rectangle{12,聽2,聽"白色"}
	r2聽:=聽Rectangle{9,聽4,聽"蓝色"}

	fmt.Println("Area聽of聽r1聽is:聽",聽r1.area())
	fmt.Println("Area聽of聽r2聽is:聽",聽r2.area())

	fmt.Println("Color聽of聽r2聽is:聽",聽r2.color)
	fmt.Println("set聽new聽color")
	r2.SetColor("绿色")聽//聽等价于(&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聽of聽r2聽is:聽",聽r2.color)
}