How can I catch all the exceptions that will be thrown through reading and writing a file?
In Java, is there any way to get(catch) all exceptions instead of catch the exception individually?
exception-handling
Is it okay to throw NullPointerException programmatically?
I see no problem with throwing a NPE as early as possible before the JVM does it for you – in particular for null arguments. There seems to be some debate about this, but there are many examples in the Java SE libraries that does exactly this. I cannot see why NPE should be holy … Read more
Good way to encapsulate Integer.parseInt()
You could return an Integer instead of an int, returning null on parse failure. It’s a shame Java doesn’t provide a way of doing this without there being an exception thrown internally though – you can hide the exception (by catching it and returning null), but it could still be a performance issue if you’re parsing hundreds of thousands of … Read more
Good way to encapsulate Integer.parseInt()
You could return an Integer instead of an int, returning null on parse failure. It’s a shame Java doesn’t provide a way of doing this without there being an exception thrown internally though – you can hide the exception (by catching it and returning null), but it could still be a performance issue if you’re parsing hundreds of thousands of … Read more
Which exception to throw for invalid input which is valid from client perspective
The question is is throwing illegal argument exception the right thing to do? It depends on how you want / need to “frame” this condition; i.e. is it a bug, a user input error, or something that the program is supposed to be able to deal with? If the case of two lines not intersecting … Read more
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
Python FileNotFound
try block should be around open. Not around prompt.
Catch multiple exceptions in one line (except block)
From Python Documentation: An except clause may name multiple exceptions as a parenthesized tuple, for example Or, for Python 2 only: Separating the exception from the variable with a comma will still work in Python 2.6 and 2.7, but is now deprecated and does not work in Python 3; now you should be using as.
Python try-else
The statements in the else block are executed if execution falls off the bottom of the try – if there was no exception. Honestly, I’ve never found a need. However, Handling Exceptions notes: The use of the else clause is better than adding additional code to the try clause because it avoids accidentally catching an exception that wasn’t raised by the … Read more