exception-handling

问题 I know about unittest Python module. I know about assertRaises() method of TestCase class. I would like to write a test that succeeds when an exception is not raised. Any hints please? 回答1: The test runner will catch all exceptions you didn't assert would be raised. Thus: doStuff() self.assert_(True) This should work fine. You can leave out the self.assert_ call, since it doesn't really do anything. I like to put it there to document that I didn't forget an assertion. 回答2: def runTest(self):

问题 In the book "Oracle Certified Professional Java SE 7 Programmer Exams 1Z0-804 and 1Z0-805 A Comprehensive OCPJP 7 Certification Guide" by S G Ganesh and Tushar Sharma, it's stated "if a method is declared in 2 or more interfaces, and if that method declares to throw different exceptions in the throws clause, the implementation should list all these exceptions" (page 347) Well, then I've tried this public interface I1 { public void x() throws I1Exception; } public interface I2 { public void x(

问题 In the book "Oracle Certified Professional Java SE 7 Programmer Exams 1Z0-804 and 1Z0-805 A Comprehensive OCPJP 7 Certification Guide" by S G Ganesh and Tushar Sharma, it's stated "if a method is declared in 2 or more interfaces, and if that method declares to throw different exceptions in the throws clause, the implementation should list all these exceptions" (page 347) Well, then I've tried this public interface I1 { public void x() throws I1Exception; } public interface I2 { public void x(

问题 I am using a method getBitmap to display images. As I am using this as a method,if it returns bitmap display an image but if it returns null,catch an exception. But if url entered is wrong also, it should handle the FileNotFoundException. How to handle two exception and display in UI? public Bitmap getBitmap(final String src) { try { InputStream stream = null; URL url = new URL(src); java.net.URL url = new java.net.URL(src); URLConnection connection = url.openConnection(); InputStream input =

问题 I'm writing some codedUI tests in VS2010 to test a web application. I'd like to be able to open the browser once for the entire set of tests in the solution and then close it again when the tests finish. I've tried AssemblyInitialize attribute on a method, with my BrowserWindow.Launch in there, but it gives me the following exception when I run it: Assembly Initialization method OrdersGridTesting.SuiteSetup.Login threw exception. Microsoft.VisualStudio.TestTools.UITest.Extension

问题 I'm developing an application for Android OS. Since this is my first application, I think I've committed some programming mistakes cause I hardly can trace bugs back to their causes. Thus, I was guessing, while i'm trying to fix bugs, is there a way to catch ALL types of exception in my entire activity lifecycle with one try-catch? That would be awesome, i'm getting bored watching my galaxy S say :"Sorry the application App has stopped unexpectly" :( 回答1: I really, really don't recommend this

问题 I know if an exception is thrown in constructor, destructor will not be called(simple class, no inheritance). So if an exception is thrown in constructor and there is a chance some heap memory is not cleaned up. So what's best practice here? let's assume I have to call some function in constructor and it may throw exception. Shall I always use shared pointer in this case? What's the alternatives? Thank you! 回答1: I would stick to the RAII idiom. If you avoid "naked" resources (like operator

问题 Now that Control.Monad.Error is deprecated, and Control.Monad.Except reigns supreme, a lot of sources online haven't caught up, and still show examples of how to use Error . So how would I go about turning instance Error MyError where noMsg = ... strMsg = ... into something using Except . Just replacing Error with Except didn't work as Except expects additional type parameters I understand that those exact methods don't exist in Except , so what's the alternative? 回答1: Short answer is:

问题 Now that Control.Monad.Error is deprecated, and Control.Monad.Except reigns supreme, a lot of sources online haven't caught up, and still show examples of how to use Error . So how would I go about turning instance Error MyError where noMsg = ... strMsg = ... into something using Except . Just replacing Error with Except didn't work as Except expects additional type parameters I understand that those exact methods don't exist in Except , so what's the alternative? 回答1: Short answer is:

问题 Now that Control.Monad.Error is deprecated, and Control.Monad.Except reigns supreme, a lot of sources online haven't caught up, and still show examples of how to use Error . So how would I go about turning instance Error MyError where noMsg = ... strMsg = ... into something using Except . Just replacing Error with Except didn't work as Except expects additional type parameters I understand that those exact methods don't exist in Except , so what's the alternative? 回答1: Short answer is: