英文:
Alternate constructor for a case class
问题
trait mobility {
def limit : Int
}
final case class Car {
brand : String,
manufacture : Int,
override val limit: Int
} extend mobility
object Car {
def apply(
brand : String,
manufacture : Int,
): Car = Car( brand , manufacture , 0)
}
编译错误 :
> 无法解析重载的方法 "Car"
我在这里做错了什么？
英文:
trait mobility {
def limit : Int
}
final case class Car {
brand : String,
manufacture : Int,
override val limit: Int
} extend mobility
object Car {
def apply(
brand : String,
manufacture : Int,
): Car = Car( brand , manufacture , 0)
}
Compilation error :
> Cannot resolve overloaded method "Car"
What am I doing incorrect here?
答案1
得分: 3
这段代码无法编译。在案例类的定义中存在语法错误。
final case class Car {
^
类的属性应该包含在括号内，而不是花括号。
另一个错误是继承类的保留字应该是 extends 而不是 extend。
} extends mobility
^^^^^^^
只需修复这些问题，代码就应该可以正常工作。
查看这个 scatsie 示例 ，使用建议的修复来运行您的代码。
英文:
That code will not compile. You have a syntax error in the definition of the case class
final case class Car {
^
The attributes of the class should be wrapped inside a parentheses instead of a curly braces.
Another error you have is that the reserved word to inherit a class is extends not extend
} extend mobility
^^^^^^
just fixing that, it should work.
Check this scatsie example using your code with the suggested fix
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