本文介绍了在案例类中获取父类的属性的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如果我有一个案例类继承了这样的另一个类
If I have a case class that inherits another class like this
class Person(name: String) {
}
case class Male() extends Person("Jack") {
def f = super.name // Doesn't work
}
如何从Male类中获取name属性?
How to get the name property from Male class ?
推荐答案
class Person(name: String) {
在此声明中, name
不是类的字段,它只是构造函数参数.因此,可以在构造函数内部访问它,但不能在外部(包括子类中)访问它.您可以通过将其设置为 val
:
In this declaration, name
is not a field of the class, it is just a constructor parameter. So it is accessible inside the constructor, but not outside (including in a subclass). You can make it a field by making it a val
:
class Person(val name: String) {
令人困惑的是,即使没有 val
Confusingly, constructor parameters for a case class
are also fields even without val
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