Kotlin中的var和val有什么区别？
我已经通过这个链接:
KotlinLang: Properties and Fields
如该链接所述:

The full syntax of a read-only property declaration differs from a mutable one in two ways: it starts with val instead of var and does not allow a setter.

fun copyAddress(address: Address): Address {
    val result = Address() // there's no 'new' keyword in Kotlin
    result.name = address.name // accessors are called
    result.street = address.street
    // ...
    return result
}

最佳答案

在您的代码中result不变，其var属性也在变化。请参阅以下评论:

fun copyAddress(address: Address): Address {
    val result = Address() // result is read only
    result.name = address.name // but not their properties.
    result.street = address.street
    // ...
    return result
}

https://stackoverflow.com/questions/44200075/