#852 – How Exceptions Work

An exception is something that happens in your application at run-time that is unexpected and which requires special logic in order for the application to continue executing normally.

Here’s how exceptions work:

  • A particular piece of code calls a method, which in turn may call other methods
  • The call stack keeps track of the calling sequence that led to the currently executing method
  • At any given time, the code that is executing may decide to throw an exception, indicating that something unexpected happened
  • The method throwing an exception stops what it’s doing and control returns to the calling method
  • The calling method may decide to catch the exception, i.e. execute some code in response to it
  • If the calling method doesn’t catch the exception, control continues back up the stack until a method is found that does catch the exception
  • If no method catches the exception, it is unhandled

About Sean
Software developer in the Twin Cities area, passionate about software development and sailing.

2 Responses to #852 – How Exceptions Work

  1. Pingback: Dew Drop – May 28, 2013 (#1,555) | Alvin Ashcraft's Morning Dew

  2. I’d highly recommend exceptionless as an exception reporting service (http://exceptionless.com/). You can easily track and fix all of your applications exceptions.

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