编写一个可以接受RuntimeException子类的scala方法

Question

我想编写一个scala方法，可以使用RuntimeException的任何子代。我有它但它不编译。代码有什么问题？

def testme(e: RuntimeException): String = {
    case e:BadRequestException=> "bad request"
    case e: IllegalArgumentException=>"illegal argument"
}

我收到以下错误

missing parameter type for expanded function
[error] The argument types of an anonymous function must be fully known. (SLS 8.5)
[error] Expected type was: String
[error]   def testme(e: RuntimeException): String = {
[error]                                             ^
[error] one error found
[error] (playWeb/compile:compileIncremental) Compilation failed
[error] Total time: 5 s, completed Sep 21, 2017 2:45:09 PM

Answer 1

您必须指定匹配的内容，例如添加def testme(e: RuntimeException): String = e match { case e:BadRequestException=> "bad request" case e: IllegalArgumentException=>"illegal argument" } ：

from ..parser.parser import Parser