final或val函数参数还是在Kotlin中? [英] final or val function parameter or in Kotlin?

问题描述

为什么Kotlin删除了在Java中非常有用的final或val函数参数?

Why does Kotlin removed the final or val function parameter which is very useful in Java?

fun say(val msg: String = "Hello World") {
    msg = "Hello To Me" // would give an error here since msg is val    
                        //or final
    ...
    ...
    ...
}

推荐答案

Kotlin函数参数为最终参数.没有val或final关键字，因为这是默认关键字(无法更改).

Kotlin function parameters are final. There is no val or final keyword because that's the default (and can't be changed).

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