Questions containing 'exceptions', answered by Jon Skeet

list of exceptions

I am looking for a list of possible exceptions in c#, c++, vb.net, j# and jscript. The problem is that some sites show me a list of 20 exceptions whereas some other site shows me...

There are loads of exceptions declared by the .NET framework - and other code (including your own) can create more. There are certainly more than 39.... look at the documentation for System.Exception and you'll see near the bottom a list... more

Can constructors throw exceptions in Java?

Are constructors allowed to throw exceptions?

Yes, constructors can throw exceptions. Usually this means that the new object is immediately eligible for garbage collection (although it may not be collected for some time, of course). It's possible for the "half-constructed" object to... more

How slow are .NET exceptions?

I don't want a discussion about when to and not to throw exceptions. I wish to resolve a simple issue. 99% of the time the argument for not throwing exceptions revolves around...

I'm on the "not slow" side. I've written two short articles about this. There are criticisms of the benchmark aspect, which are mostly down to "in real life there'd be more stack to go through, so you'd blow the cache etc" - but using... more

How to work with unchecked exceptions?

Java has compiler checked exceptions. When I made transition to C++, I learned it doesn't feature checked exceptions. At first, I kept using exception handling, because it's a...

When I first started using C# I was scared by this too. Then I found that actually, it doesn't matter very often. I very rarely find that I can catch an exception and so something useful with it anyway... almost all my exceptions bubble up... more

Errors and Exceptions

I am using JDK1.6_14. This is a generic question though. When to go for error handling and when to go for exception handling? For example, when I carry a division operation out,...

In general, avoid provoking an exception which you could easily have avoided by execution-time testing and which could be a problem for reasons other than a bug elsewhere in your code. If you're going to divide by something and you have... more

Catching exceptions in Java

There are certain predefined exceptions in Java, which, if thrown, report that something serious has happened and you'd better improve your code, than catching them in a catch...

No, there's nothing wrong with catching IOException and FileNotFoundException - if you can genuinely handle those exceptions. That's the important bit - can you really proceed in the face of that exception? Sometimes you can - very often... more

Is it possible to handle exceptions within LINQ queries?

Example: myEnumerable.Select(a => ThisMethodMayThrowExceptions(a)); How to make it work even if it throws exceptions? Like a try catch block with a default value case an...

Call a projection which has that try/catch: myEnumerable.Select(a => TryThisMethod(a)); ... public static Bar TryThisMethod(Foo a) { try { return ThisMethodMayThrowExceptions(a); } ... more

Example of chained exceptions stack

I do not know much about these technologies, and was not very successful at finding how an exception stack is displayed. Therefore, several basic questions: how are 2...

It's pretty easy to try this for yourself. For example: using System; class Test { static void Main(string[] args) { try { Top(); } catch (Exception e) { ... more

On Asserts and Exceptions; Java

In this specific scenarios, are asserts more appropriate then exceptions? It is my understanding that assert should be used when program is FUBAR to a degree where it can not...

Personally I'm not keen on using assertions for this sort of thing, simply because they can be turned off. Some places use assertions when running tests, but then disable them for production for the sake of speed. To me this is like taking... more

java throwing checked exceptions?

I am pretty sure that this worked before, but eclipse says there is error with it in throw line. try{} }catch(Exception e){ throw e; } In my old student project I...

Presumably your method is declared to throw UnsupportedAddressTypeException but not SQLException and ClassNotFoundException. Checked exceptions can only be thrown (including rethrowing an existing one) from methods which declare that they... more