try-catch
try/catch block in Arduino
The Arduino reference is not listing try catch (for details of why see, for example, this related answer). And I assume, that implementing try catch on a µ-controller could be kind of difficult/impossible. Try catch in most languages is a quite expensive operation: The program stack get copied once for the try block and for … Read more
JAVA + try catch(FileNotFoundException e) going in catch(Exception e)?
It’s also possible that the specific issue you’re having isn’t a FileNotFoundException. By using the “Exception” in a catch block (which is the parent class to all Exceptions) this is effectively a “catch all”, since it will run if there is an `Exception or any of its subclasses thrown. Try the following change: This will … Read more
Ruby equivalent for Python’s “try”?
Use this as an example: The equivalent code in Python would be:
Multiple try codes in one block
You’ll have to make this separate try blocks: This assumes you want to run code c only if code b failed. If you need to run code c regardless, you need to put the try blocks one after the other: I’m using except ExplicitException here because it is never a good practice to blindly ignore … Read more
IsNumeric function in c#
I know it’s possible to check whether the value of a text box or variable is numeric using try/catch statements, but IsNumeric is so much simpler. One of my current projects requires recovering values from text boxes. Unfortunately, it is written in C#. I understand that there’s a way to enable the Visual Basic IsNumeric … Read more
unreported exception java.io.FileNotFoundException; must be caught or declared to be thrown
You need to put the file processing statements inside a method:
Can I catch multiple Java exceptions in the same catch clause?
This has been possible since Java 7. The syntax for a multi-catch block is: Remember, though, that if all the exceptions belong to the same class hierarchy, you can simply catch that base exception type. Also note that you cannot catch both ExceptionA and ExceptionB in the same block if ExceptionB is inherited, either directly or indirectly, from ExceptionA. The compiler will complain: … Read more
EOFException – how to handle?
While reading from the file, your are not terminating your loop. So its read all the values and correctly throws EOFException on the next iteration of the read at line below: If you read the documentation, it says: Throws: EOFException – if this input stream reaches the end before reading eight bytes. IOException – the stream has … Read more
What is the proper way to handle a NumberFormatException when it is expected?
Is there a method that I can call that will tell me if Integer.parseInt() will throw a NumberFormatException before calling it? Then I would have no problem logging this, since it should never happen. Sadly, no. At least not in the core Java API. It’s easy to write one, however – just modify the code … Read more