Scala中的自定义异常 [英] Custom Exception in scala

问题描述

我如何在Scala中创建扩展 Exception 类的自定义异常，并在异常发生时抛出它们并捕获它们。

how can i create custom exceptions in Scala extending Exception class and throw them when exception occurs as well as catch them.

java中的示例：

class CustomException extends Exception {

  public final static String _FAIL_TO_INSERT = "FAIL_TO_INSERT";

}

推荐答案

final case class CustomException(private val message: String = "", 
                           private val cause: Throwable = None.orNull)
                      extends Exception(message, cause) 

只需尝试捕获：

try {
    throw CustomException("optional")
} catch {
    case c: CustomException =>
          c.printStackTrace
}

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