How do I stop a program when an exception is raised in Python?
import sys try: print(“stuff”) except: sys.exit(1) # exiting with a non zero value is better for returning from an error
exception-handling
Why do Java people frequently consume exceptions silently?
I have always thought, that’s similar to the following scenario: “A man gets shot. He holds his breath and has enough strength to take a bus. 10 miles later the man gets off of the bus, walks a couple of blocks and dies.” When the police gets to the body, they don’t have a clue … Read more
Do you really need the ‘finally’ block
I know this is a very old question but I came across today and I was confused by the answers given. I mean, they are all correct but all answer on a theoretical or even philosophical level when there is a very straightforward practical answer to this question. If you put a return, break, continue … Read more
What destructors are run when the constructor throws an exception?
if a constructor throws an exception, what destructors are run? Destructors of all the objects completely created in that scope. Does it make any difference if the exception is during the initialization list or the body? All completed objects will be destructed. If constructor was never completely called object was never constructed and hence cannot … Read more
When to use throws in a Java method declaration?
If you are catching an exception type, you do not need to throw it, unless you are going to rethrow it. In the example you post, the developer should have done one or another, not both. Typically, if you are not going to do anything with the exception, you should not catch it. The most … Read more
When and how should I use exception handling?
Here’s quite comprehensive guide on exceptions that I think is a Must Read: Exceptions and error handling – C++ FAQ or C++ FAQ lite As a general rule of thumb, throw an exception when your program can identify an external problem that prevents execution. If you receive data from the server and that data is … Read more
What is a suppressed exception?
To clarify the quote in Jon’s answer, only one exception can be thrown by a method (per execution) but it is possible, in the case of a try-with-resources, for multiple exceptions to be thrown. For instance one might be thrown in the block and another might be thrown from the implicit finally provided by the … Read more
Use tryCatch skip to next value of loop upon error?
The key to using tryCatch is realising that it returns an object. If there was an error inside the tryCatch then this object will inherit from class error. You can test for class inheritance with the function inherit. x <- tryCatch(stop(“Error”), error = function(e) e) class(x) “simpleError” “error” “condition” Edit: What is the meaning of … Read more
Who is calling the Java Thread interrupt() method if I’m not?
The Thread interrupt mechanism is the preferred way to get a (cooperating) thread to respond a request to stop what it is doing. Any thread (including the thread itself I think) could call interrupt() on a Thread. In practice, the normal use-cases for interrupt() involve some kind of framework or manager telling some worker thread … Read more
Why does C# allow you to ‘throw null’?
Because the language specification expects an expression of type System.Exception there (therefore, null is a valid in that context) and doesn’t restrict this expression to be non-null. In general, there’s no way it could detect whether the value of that expression is null or not. It would have to solve the halting problem. The runtime … Read more