try-catch

问题 Fairly simple. I have a BIG class for my main project, and it became "unwieldy". SO today I decided to try making my own class , so I could simplify some of the code in the big class . So this is my "little" class , I used for the Data storage . The TRY/CATCH statement works when floating by itself in the BIG class. In the little class though, it throws an NPE. It seems the Try/Catch system isn't working when I make my own class . Any thoughts on why? file_in = openFileInput("array_saved");

问题 print("Welcome to Hangman! Guess the mystery word with less than 6 mistakes!") words= ['utopian','fairy','tree','monday','blue'] while True: try: i = int(input("Please enter an integer number (0<=number<10) to choose the word in the list: ")) break except ValueError: if(i!=int): print("Must be an integer input.") else: print("Empty input.") Getting into handling exceptions on my Hangman program and once again I've come across another problem. You can run this program and see where I went

问题 I know how to use try/catch block in case of database calls and know how to use "using" directive in context of using try/finally construction as well. But, can I mix them? I mean when I use "using" directive can I use try/catch construction as well because I still need to handle possible errors? 回答1: Of course you can do it: using (var con = new SomeConnection()) { try { // do some stuff } catch (SomeException ex) { // error handling } } using is translated by the compiler into a try.

问题 Inside a method, I use a Scanner to read text inside a file. This file doesn't always exist, and if it doesn't, I want simply to do nothing (i.e. no scan). Of course I could use a try/catch like this: String data = null; try { Scanner scan = new Scanner(new File(folder + "file.txt")); data=scan.nextLine(); scan.close(); } catch (FileNotFoundException ex) { } My question is what can I do to avoid the try/catch? Because I don't like local variable unused. I was thinking of something like:

问题 I've got a similar problem to this question: TRY CATCH with Linked Server in SQL Server 2005 Not Working I'm running this try catch: Declare @command nvarchar(100) SET @command = 'SELECT column FROM table' BEGIN TRY BEGIN TRY exec ' + @Server_Name + @DB_name + '.dbo.sp_executesql @command END TRY BEGIN CATCH PRINT EXCEPTION END CATCH I don't think I can use RAISEERROR because I'm not running my own stored procedure, I'm only running a simple select statement. I've tried using @@ERROR but that

问题 A coworker alerted me to this handy piece of VBA he found on the web, which unlocks a worksheet in Microsoft Excel without a password: Sub PasswordBreaker() 'Breaks worksheet password protection. Dim i As Integer, j As Integer, k As Integer Dim l As Integer, m As Integer, n As Integer Dim i1 As Integer, i2 As Integer, i3 As Integer Dim i4 As Integer, i5 As Integer, i6 As Integer On Error Resume Next For i = 65 To 66: For j = 65 To 66: For k = 65 To 66 For l = 65 To 66: For m = 65 To 66: For

问题 In the below code I am attempting to allow the program to catch an exception for an invalid input from user but still allow the program to loop back to the start of the method once exception has been caught. However in my example once there is an exception the program terminates. How can I rectify this? Thank a lot in advance! public static void add() { // Setting up random Random random = new Random(); // Declaring Integers int num1; int num2; int result; int input; input = 0; // Declaring

问题 The code below asks the user how many racers he/she would like. while (true) { // loops forever until break try { // checks code for exceptions System.out.println("How many racers should" + " participate in the race?"); amountRacers = in.nextInt(); break; // if no exceptions breaks out of loop } catch (InputMismatchException e) { // if an exception appears prints message below System.err.println("Please enter a number! " + e.getMessage()); continue; // continues to loop if exception is found

问题 if i try to run following code in sql server 2005 i get error BEGIN TRY SELECT 1/0; END TRY BEGIN CATCH SELECT ERROR_NUMBER() AS ErrorNumber ,ERROR_SEVERITY() AS ErrorSeverity ,ERROR_STATE() AS ErrorState ,ERROR_PROCEDURE() AS ErrorProcedure ,ERROR_LINE() AS ErrorLine ,ERROR_MESSAGE() AS ErrorMessage; END CATCH; GO Error: Line 1: Incorrect syntax near 'TRY'. Msg 156, Level 15, State 1, Line 4 Incorrect syntax near the keyword 'END'. Msg 195, Level 15, State 10, Line 7 'ERROR_NUMBER' is not a

问题 I am currently working on thousands of files (with .MOD extension) where I want to extract specific information from all these files. These information will then be collected into one excel sheet in such a way that each row represents information extracted from one .MOD file. I have managed to do this. However, there are lets say about 10-20 files (out of the tens of thousands) that do not contain information in the format that I want, and this therefore throws an error. I cannot of course