dart try-catch
try { // ... } on SomeException catch(e) { //Handle exception of type SomeException } catch(e) { //Handle all other exceptions }
dart try-catch
try { // ... } on SomeException catch(e) { //Handle exception of type SomeException } catch(e) { //Handle all other exceptions }
dart try
HOW TO HANDLE EXCEPTIONS IN DART/FLUTTER! # ------------------------ CASE 1: --------------------------- # When you know the exception to be thrown, use ON Clause try { int result = 12 ~/ 0; print("The result is $result"); } on IntegerDivisionByZeroException { print("Cannot divide by Zero"); } # ------------------------ CASE 2: --------------------------- # When you do not know the exception use CATCH Clause try { int result = 12 ~/ 0; print("The result is $result"); } catch (e) { print("The exception thrown is $e"); } # ------------------------ CASE 3: --------------------------- # Using STACK TRACE to know the events that occurred before the Exception was thrown (trace and print the code steps after the error) try { int result = 12 ~/ 0; print("The result is $result"); } catch (e, s) { print("The exception thrown is $e"); print("STACK TRACE n $s"); } # ------------------------ CASE 4: --------------------------- # Whether there is an Exception or not, FINALLY Clause is always Executed try { int result = 12 ~/ 3; print("The result is $result"); } catch (e) { print("The exception thrown is $e"); } finally { print("This is FINALLY Clause and is always executed."); } # ------------------------ CASE 5: --------------------------- # Custom Exception.The throw keyword is used to explicitly raise an exception, and, in this case, that exception was defined by the following exemple: void main(){ try { depositMoney(-200); } catch (e) { print(e.errorMessage()); } finally { // Code } } class DepositException implements Exception { String errorMessage() { return "You cannot enter amount less than 0"; } } void depositMoney(int amount) { if (amount < 0) { throw new DepositException(); } }
dart try catch
try { breedMoreLlamas(); } on OutOfLlamasException { // A specific exception buyMoreLlamas(); } on Exception catch (e) { // Anything else that is an exception print('Unknown exception: $e'); } catch (e) { // No specified type, handles all print('Something really unknown: $e'); } finally { // Always clean up, even if case of exception cleanLlamaStalls(); }
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