捕获在Scala中抛出的异常 - 不可达的catch块 [英] Catch in Java a exception thrown in Scala - unreachable catch block

问题描述

Scala 没有检查例外。但是，从java调用scala代码时，最好捕获scala抛出的异常。

Scala doesn't have checked exceptions. However, when calling scala code from java, it's desirable to catch exceptions thrown by scala.

Scala：

def f()=
    {
    //do something that throws SomeException
    }

Java：

try
    { f() }
catch (SomeException e)
    {}

javac不喜欢，并且抱怨这个异常从未从try语句体中抛出

javac doesn't like this, and complains that "this exception is never thrown from the try statement body"

有没有办法让scala声明它抛出一个被检查的异常？

Is there a way to make scala declare that it throws a checked exception?

推荐答案

使用 throws 注释：

@throws(classOf[SomeException])
def f()= {
    //do something that throws SomeException
    }

您也可以注释类构造函数：

class MyClass @throws(classOf[SomeException]) (arg1: Int) {
}

这是覆盖在Scala旅游

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