On Windows, exceptions are supported at the operating system level. Called Structured Exception Handling (SEH), they are the rough equivalent to Unix signals. Compilers that generate code for Windows typically take advantage of this, they use the SEH infrastructure to implement C++ exceptions. In keeping with the C++ standard, the throw and catch keywords only … Read more
On Linux we can have these as exceptions, too. Normally, when your program performs a segmentation fault, it is sent a SIGSEGV signal. You can set up your own handler for this signal and mitigate the consequences. Of course you should really be sure that you can recover from the situation. In your case, I … Read more
Because it’s declared in the try block. Local variables are declared in one block are inaccessible in other blocks except if contained in it, i.e., the variables go out of scope when their block ends. Do this: private void loadCommands(String fileName) { BufferedReader br = null; try { br = new BufferedReader(new FileReader(fileName)); while (br.ready()) … Read more
Why are Objects created within the try/catch block not in scope with the rest of the method? They are. Variables declared within the try/catch block are not in scope in the containing block, for the same reason that all other variable declarations are local to the scope in which they occur: That’s how the specification … Read more
Yes, you can install an interrupt handler using the module signal, and wait forever using a threading.Event: import signal import sys import time import threading def signal_handler(signal, frame): print(‘You pressed Ctrl+C!’) sys.exit(0) signal.signal(signal.SIGINT, signal_handler) print(‘Press Ctrl+C’) forever = threading.Event() forever.wait()
Never use Thread.sleep() when code is executing on the Event Dispatch Thread. Instead you should use a Swing Timer to schedule your animation. See the sections from the Swing tutorial on: Concurrency in Swing How to Use Timers Or if you don’t want to use a Timer, then you can use a SwingWorker (as described … Read more
You need to enclose your try-catch inside a while loop like this: – int count = 0; int maxTries = 3; while(true) { try { // Some Code // break out of loop, or return, on success } catch (SomeException e) { // handle exception if (++count == maxTries) throw e; } } I have … Read more
The main point of try-with-resources is to make sure resources are closed reliably without possibly losing information. When you don’t use try-with-resources there’s a potential pitfall called exception-masking. When code in a try block throws an exception, and the close method in the finally also throws an exception, the exception thrown by the try block … Read more
No it does not. It will always execute provided the application is still running (except during a FastFail exception, MSDN link, like others noted). It will execute when it exits the try/catch portion of the block. It will NOT execute if the application crashes: gets killed through a kill process command etc. This is highly … Read more
try has almost no expense at all. Instead of doing the work of setting up the try at runtime, the code’s metadata is structured at compile time such that when an exception is thrown, it now does a relatively expensive operation of walking up the stack and seeing if any try blocks exist that would … Read more