Also if you’re using Java 7, you can use a try-with-resources statement: try(BufferedReader r = new BufferedReader(new InputStreamReader(address.openStream()))) { String inLine; while ((inLine = r.readLine()) != null) { System.out.println(inLine); } } catch(IOException readException) { readException.printStackTrace(); }
It’s not a question of which is faster, rather one of correctness. An exception is for circumstances which are exactly that, exceptional. If it is possible for n to be null as part of normal business logic, then use an if..else, else throw an exception.
You could use the following function and then use that to oneline your try/catch. It’s use would be limited and makes the code harder to maintain so i’ll never use it. var v = tc(MyTryFunc, MyCatchFunc); tc(function() { alert(‘try’); }, function(e) { alert(‘catch’); }); /// try/catch function tc(tryFunc, catchFunc) { var val; try { val … Read more
The means of accomplishing this that I’ve seen require an extra method: public static void MyMethod() { using (var scope = MyScopedBehavior.Begin()) { //Do stuff with scope here scope.Complete(); // Tells the scope that it’s good } } By doing this, your scope object can track whether it’s disposing because of an error, or a … Read more
Personally instead of polluting builtin objects I would go with a decorator technique: var makeSafe = function(fn){ return function(){ try{ return fn.apply(this, arguments); }catch(ex){ ErrorHandler.Exception(ex); } }; }; You can use it like that: function fnOriginal(a){ console.log(1/a); }; var fn2 = makeSafe(fnOriginal); fn2(1); fn2(0); fn2(“abracadabra!”); var obj = { method1: function(x){ /* do something */ … Read more
One way you can do is throwing your own errors on finding nil. With having this sort of your own error: enum MyError: Error { case FoundNil(String) } You can write something like this: do{ let xmlString = try String(contentsOf: accessURL, encoding: String.Encoding.utf8) guard let xmlDict = XMLDictionaryParser.sharedInstance().dictionary(with: xmlString) else { throw MyError.FoundNil(“xmlDict”) } guard … Read more
You use transactions when the set of database operations you are making needs to be atomic. That is – they all need to succeed or fail. Nothing in between. Transactions are to be used to ensure that the database is always in a consistent state. In general, unless there is a good reason not to … Read more