Kotlin数据类可以具有多个构造函数吗? [英] Can Kotlin data class have more than one constructor?
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问题描述
我知道数据类就像是kotlin中的简单模型,默认情况下具有getter和setter,并且非常简单:
I know that data class are like simple models in kotlin with getters and setter by default and are as simple this:
data class User(val name: String, val age: Int)
是否可以为该数据类声明第二个构造函数?
Is it possible to declare a second constructor for that data class?
推荐答案
您可以像这样设置数据类
you can set the data class like this
data class User(val name: String? = null, val id: String? = null, val email: String? = null)
,您可以使用多个类似
val userId = User(id = "123456")
val userMail = User(email= "email@email.com")
val userName = User("Name")
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