August 2020
Intermediate to advanced
483 pages
11h 24m
Chinese
Content preview from Head First Kotlin程序设计
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100 第
4
章
Dog construction
现象背后：调用
Dog
构造函数
接下来，一起探讨在以下代码运行时会发生什么步骤：
var myDog = Dog("Fido", 70, "Mixed")
Dog
系统会为一个新的
Dog
对象分配空间
，
并且
Dog
构造函数会
被调用
。
2
Dog
name
val String
weight
var Int
breed
val String
Dog
构造函数定义了三个属性
：
名称
、
重量以及品种
。
在这个现象背后，每一个属性实际上是一个变量。对于构造函数中定义的每个属性，
都会有一个相应类型的变量被创建。
3
class Dog(val name: String,
var weight: Int,
val breed: String) {
}
系统会为每个传入
Dog
构造函数的参数创建一个对象
。
它会创建一个值为“
Fido
”的String，一个值为
70
的Int，以及一个值为“
Mixed
”
的String。
1
“Fido”
String
70
Int
“Mixed”
String
构造
Dog
你现在的位置 4 101
classes and objects
类和对象
让故事继续
相应的变量的引用将会被赋值给
Dog
的属性
。
例如，值为“
Fido
”的String将会被赋值给name属性。
4
var Dog
Dog
引用
myDog ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.