在Go中声明带有“ var”的新结构实例与使用“ new”有何不同？

问题描述：

The following code creates a usable instance of the struct, Car. How is this different than using new(Car)?

Example:

type Car struct {
  make string
}

func Main() {
  var car Car; // how is this different than "car := new(Car)"?

  car.make = "Honda"
}

以下代码创建了结构Car code>的可用实例。与使用 new（Car） code>有什么不同？ p>

示例： p>


  type Car struct {\  n生成字符串
} 
 
func Main（）{
 var car Car;  //这与“ car：= new（Car）”有何不同？
 
 car.make =“ Honda” 
} 
  code>  pre> 
  div>

答

One defines a Car variable, the other returns a pointer to a Car.

var car Car      // defines variable car is a Car
car2 := new(Car) // defines variable car2 is a *Car and assigns a Car to back it

car := new(Car) can be implemented in relation to var car Car like this:

var x Car
car := &x