try-finally

问题 Will the following code: while True: try: print("waiting for 10 seconds...") continue print("never show this") finally: time.sleep(10) Always print the message "waiting for 10 seconds...", sleep for 10 seconds, and do it again? In other words, do statements in finally clauses run even when the loop is continue -ed? 回答1: From the python docs: When a return, break or continue statement is executed in the try suite of a try...finally statement, the finally clause is also executed ‘on the way out

问题 Will the following code: while True: try: print("waiting for 10 seconds...") continue print("never show this") finally: time.sleep(10) Always print the message "waiting for 10 seconds...", sleep for 10 seconds, and do it again? In other words, do statements in finally clauses run even when the loop is continue -ed? 回答1: From the python docs: When a return, break or continue statement is executed in the try suite of a try...finally statement, the finally clause is also executed ‘on the way out

问题 Will the following code: while True: try: print("waiting for 10 seconds...") continue print("never show this") finally: time.sleep(10) Always print the message "waiting for 10 seconds...", sleep for 10 seconds, and do it again? In other words, do statements in finally clauses run even when the loop is continue -ed? 回答1: From the python docs: When a return, break or continue statement is executed in the try suite of a try...finally statement, the finally clause is also executed ‘on the way out

问题 This question already has answers here : Why Dispose is not called even with using-statement? (1 answer) If I return out of a try/finally block in C# does the code in the finally always run? (4 answers) Closed last month . Are there guarantees in C# that the using statement won`t inherit the try + finally combinations issues? The question naturally follows the discussion from other here. According to the documentation: using (var font1 = new Font("Arial", 10.0f)) { byte charset = font1

问题 This question already has answers here : Why Dispose is not called even with using-statement? (1 answer) If I return out of a try/finally block in C# does the code in the finally always run? (4 answers) Closed last month . Are there guarantees in C# that the using statement won`t inherit the try + finally combinations issues? The question naturally follows the discussion from other here. According to the documentation: using (var font1 = new Font("Arial", 10.0f)) { byte charset = font1

问题 For a long time I thought that it allows me to free up all the resources in the finally block and I thought that if an exception happens in the try block, then the resources will still be free up in the finally block. But that seems not to be the case. I have the following piece of code: using System; public sealed class Program { public static void Main() { try { int zero = 0; int i = 1/zero; } finally { Console.WriteLine("divide by zero"); //the line is never called } } } I never reach the

问题 I'm writing a loop that ignored the Exception and it works well. for (; flag; ) { try { //do something ignore exception. Runnable r = queue.pollFirst(); r.run(); } catch (Exception ignored) { // ignored. } } But my question is: If I don't catch RuntimeException and force continue loop in finally block, what will happen to the Exception and returned value? Example: for (int i = 0; i < 10; i++) { try { System.out.println(i); throw new RuntimeException(); } finally { //what will happen to the

问题 I have code: class Test { public static void main(final String [] args) { System.out.println(foo()); } private static int foo() { int a = 0; try { ++a; return a; } finally { a = 10; } } } I can't uderstand why 1 is printed. 回答1: try { ++a; return a; // 1 is returned here } finally { a = 10; // a is assigned with 10 later. } The value of a is incremented and returned in the try block itself. Post this return , the value of a is re-assigned in the finally block. And that is the reason, why it

问题 Please explain why Exception comes in first program but not in second program. 1) without return statement in read method class Example { public static void read() { try { int i = 9/0; } finally { System.out.println("This proogram is giving exception"); } } public static void main(String[] fel) { read(); } } 2)with return statement in read method class Example { public static void read() { try { int i = 9/0; } finally { System.out.println("This proogram is not giving exception"); return; } }

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . Consider : public static void read(String filename) throws IOException { String charsetName = "UTF-8"; InputStream file = new