scala - Scala中的自定义异常

Question

我如何在 Scala 扩展中创建自定义异常 Exception类并在发生异常时抛出它们并捕获它们。

java中的例子:

class CustomException extends Exception {

  public final static String _FAIL_TO_INSERT = "FAIL_TO_INSERT";

}

Answer 1

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

试试看:

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