Without using finally, how can we execute any compulsory statement even after exception is thrown ?? Furthermore, the variables used or the method has scope only inside the try block. This question was asked by me in a interview. please suggest the answer.
try{ //........ statement 1 // ....... statement 2 might throw an Exception // ....... statement 3 - A compulsory statement needs to be executed even if exception is thrown. } catch { } This is really only academic - if you want a statement to be executed after an exception is thrown, you really should use finally. However, you could catch the exception in a try-catch-block, put your statement inside the catch clause, and then rethrow the exception. Emphasis on could, of course you should not.
/* * DO NOT DO THIS! (Even if you could.) */ try { //........ statement 1 Exception e = null; try { // ....... statement 2 might throw an Exception } catch (Exception e2) { e = e2; } // ....... statement 3 - A compulsory statement // needs to be executed even if exception is thrown. if (e!=null) { throw e; } } catch { } You could be wrapping the problematic part into another catch block and manually manage what finally would do
try{ //........ statement 1 Exception saved = null; try { // ....... statement 2 might throw an Exception } catch (Exception e) { saved = e; } // ....... statement 3 - A compulsory statement // needs to be executed even if exception is thrown. if (saved != null) throw saved; } catch { } That's kind of problematic though since you'd have to catch(Throwable) to get the same effect as finally, and Throwable is a checked exception meaning that you suddenly have to declare it or use dirty tricks: Java SneakyThrow of exceptions, type erasure
What about this:
boolean flag = true; int firstExecution = 0; while(flag){ try{ firstExecution++; if(firstExecution==1){ //........ statement 1 // ....... statement 2 might throw an Exception } // ....... statement 3 - A compulsory statement needs to be executed even if exception is thrown. flag=false; } catch {} } And if you want to try to execute statement 2 again and again then you can shift the bracket below statement 2 to above it.
VERY BAD EXAMPLE NEVER DO THIS. USE FINALLY. JAVA DEVELOPERS HAVE DONE SO MUCH TO PROVIDE YOU WITH FINALLY.
try {
// statement 1 try { // statement 2 ---- might throw an Exception } catch (Exception e) { } // Put your compulsory statement 3 here. } catch {
}
This is what i can suggest.
finallyis for...)finallyis there. Don't work there ;)