finally

When try , finally combination is used, in try if there is a return statement.Why is finally block executed first? class Palindrome { public static void main(String args[]) { System.out.println(Palindrome.test()); } public static int test() { try { //return 0; return 100; } finally { System.out.println("finally trumps return."); } } } In the above code please tell me the flow of execution. I know that finally will be executed mandatorily after the try block.But in try block, return staatement will take the control to main class. In that case how will the control come to finally block? What do

Why does the exception in foo whizz by unnoticed, but the exception in bar is raised? def foo(): try: raise Exception('foo') finally: return def bar(): try: raise Exception('bar') finally: pass foo() bar() From the Python documentation : If the finally clause raises another exception or executes a return or break statement, the saved exception is lost. 来源： https://stackoverflow.com/questions/8574856/python-try-finally

Is it possible to determine if code is currently executing in the context of a finally handler as a result of an exception being thrown? I'm rather fond of using the IDisposable pattern to implement entry/exit scoping functionality, but one concern with this pattern is that you might not necessarily want the end-of-scope behavior to occur if an exception occurs in the body of the using . I'd be looking for something like this: public static class MyClass { public static void MyMethod() { using (var scope = MyScopedBehavior.Begin()) { //Do stuff with scope here } } } public sealed class

In my Angular.js application, I'm running some asynchronous operation. Before it starts I cover the application with a modal div, then once the operation is complete, I need to remove the div, whether the operation was successful or not. Currently I have this: LoadingOverlay.start(); Auth.initialize().then(function() { LoadingOverlay.stop(); }, function() { LoadingOverlay.stop(); // Code needs to be duplicated here }) It works well, however I would prefer to have something cleaner like this pseudo-code: LoadingOverlay.start(); Auth.initialize().finally(function() { // *pseudo-code* - some

结论 1、不管try,finally都会执行； 2、在try中return，在finally执行前会把结果保存起来，即使在finally中有修改也以try中保存的值为准，但如果是引用类型，修改的属性会以finally修改后的为准； 3、如果try/finally都有return，直接返回finally中的return。 来源： https://www.cnblogs.com/lovedaodao/p/11417262.html

Note: this is not a duplicate of Jeff's question . That question asked "Is an equivalent?" I know there isn't, and I want to know why! The reason I ask is that I've only just become clear on how important it is, and the conclusion seems very strange to me. The Exception Handling block of Microsoft's Enterprise Library advises us to use this pattern: catch (Exception x) { if (ExceptionPolicy.HandleException(x, ExceptionPolicies.MyPolicy)) throw; // recover from x somehow } The policy is defined in an XML file, so that means that if a customer has an issue, we can modify the policy to assist

会在 return 中间执行！ try 中的 return 语句调用的函数先于 finally 中调用的函数执行，也就是说 return 语句先执行， finally 语句后执行，但 return 并不是让函数马上返回，而是 return 语句执行后，将把返回结果放置进函数栈中，此时函数并不是马上返回，它要执行 finally 语句后才真正开始返回！但此时会出现两种情况： ① 、如果 finally 中也有 return ，则会直接返回并终止程序，函数栈中的 return 不会被完成！； ② 、如果 finally 中没有 return ，则在执行完 finally 中的代码之后，会将函数栈中的 try 中的 return 的内容返回并终止程序； catch 同 try; package com.test; public class Test1 { public static void main(String[] args) { try { System.out.println(new Test1().testname()); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } public String testname() throws Exception {

In Java, what purpose do the keywords final , finally and finalize fulfil? final final can be used to mark a variable "unchangeable" private final String name = "foo"; //the reference name can never change final can also make a method not "overrideable" public final String toString() { return "NULL"; } final can also make a class not "inheritable". i.e. the class can not be subclassed. public final class finalClass {...} public class classNotAllowed extends finalClass {...} // Not allowed finally finally is used in a try/catch statement to execute code "always" lock.lock(); try { //do stuff }

Everything I've read claims an abort on a thread will execute the finally block before ending from a ThreadAbortException. I wanted to confirm this so I can plan on how to handle some 3rd party code that can hang indefinitely. However the following test has me confused: public void runTest(DateTime deadline) { testThread = new Thread(() => { try { Console.WriteLine("test thread started at " + DateTime.Now.ToShortTimeString()); while (true) { } } finally { Console.WriteLine("test thread entered FINALLY at " + DateTime.Now.ToShortTimeString()); while (true) { } } }); testThread.Start(); while