Error Handling

• Traditional approach: Method returns error code
• Problem: Forget to check for error code
  • Failure notification may go undetected
• Problem: Calling method may not be able to do anything about failure
  • Program must fail too and let its caller worry about it
  • Many method calls would need to be checked
• Instead of programming for success
  x.doSomething()
  you would always be programming for failure:
  if (!x.doSomething()) return false;