Questions related to the finally block in try-catch construct.
Questions tagged [finally]
278 questions
57
votes
7 answers
Multiple returns: Which one sets the final return value?
Given this code:
String test() {
try {
return "1";
} finally {
return "2";
}
}
Do the language specifications define the return value of a call to test()? In other words: Is it always the same in every JVM?
In the Sun…
Daniel Rikowski
- 71,375
- 57
- 251
- 329
47
votes
3 answers
Angular 6 / Rxjs - how to basics: observables success, error, finally
I'm building an architecture on latest Angular 6 and coming from AngularJS there's something I can't make peace about: the basic processing of an HTTP request.
So, for the sake of the question, let's say I…
Simon Peyou
- 693
- 1
- 6
- 13
46
votes
6 answers
What is the benefit to use "finally" after try-catch block in java?
The "finally" block is always executed when the try-catch ends, either in case of exception or not.
But also every line of code outside and after the try-catch is always executed.
So, why should I use the finally statement?
Example:
try {
…
Aarath
- 481
- 1
- 4
- 4
43
votes
7 answers
Why is `continue` not allowed in a `finally` clause in Python?
The following code raises a syntax error:
>>> for i in range(10):
... print i
... try:
... pass
... finally:
... continue
... print i
...
File "", line 6
SyntaxError: 'continue' not supported inside 'finally'…
ElenaT
- 2,600
- 4
- 24
- 41
43
votes
9 answers
'Finally' equivalent for If/Elif statements in Python
Does Python have a finally equivalent for its if/else statements, similar to its try/except/finally statements? Something that would allow us to simplify this:
if condition1:
do stuff
clean up
elif condition2:
do stuff
…
nobillygreen
- 1,548
- 5
- 19
- 27
40
votes
2 answers
Are resources closed before or after the finally?
In Java 7's try-with-resources, I don't know which order the finally block and the auto-closing happens. What's the order?
BaseResource b = new BaseResource(); // not auto-closeable; must be stop'ed
try(AdvancedResource a = new AdvancedResource(b))…
djechlin
- 59,258
- 35
- 162
- 290
38
votes
8 answers
Determine if executing in finally block due to exception being thrown
Is it possible to determine if code is currently executing in the context of a finally handler as a result of an exception being thrown? I'm rather fond of using the IDisposable pattern to implement entry/exit scoping functionality, but one concern…
Dan Bryant
- 27,329
- 4
- 56
- 102
36
votes
8 answers
java try finally block to close stream
I want to close my stream in the finally block, but it throws an IOException so it seems like I have to nest another try block in my finally block in order to close the stream. Is that the right way to do it? It seems a bit clunky.
Here's the code:
…
jhlu87
- 3,999
- 8
- 38
- 48
33
votes
3 answers
java: try finally blocks execution
I am confused about the try-finally execution when there exists return; in the try block. In my understanding, the finally block will always be executed, i.e. before returning to the calling method. While considering the following simple…
yifei
- 561
- 5
- 18
33
votes
10 answers
What is the purpose of "finally" in try/catch/finally
The syntax will change from language to language, but this is a general question.
What is the difference between this....
try
{
Console.WriteLine("Executing the try statement.");
throw new NullReferenceException();
}
catch…
Maxx
- 3,925
- 8
- 33
- 38
30
votes
6 answers
Why doesn't C# have support for first pass exception filtering?
Note: this is not a duplicate of Jeff's question.
That question asked "Is an equivalent?" I know there isn't, and I want to know why!
The reason I ask is that I've only just become clear on how important it is, and the conclusion seems very strange…
Daniel Earwicker
- 114,894
- 38
- 205
- 284
28
votes
4 answers
return eats exception
I found the following behavior at least weird:
def errors():
try:
ErrorErrorError
finally:
return 10
print errors()
# prints: 10
# It should raise: NameError: name 'ErrorErrorError' is not defined
The exception disappears…
nosklo
- 217,122
- 57
- 293
- 297
28
votes
2 answers
Correctly implement finally block using C++ lambda
I want to implement a finally block in my C++ program, and the language certainly has the tools to do it if not a native facility. I was wondering what the best way to do this is?
Potatoswatter
- 134,909
- 25
- 265
- 421
27
votes
5 answers
try-catch-finally with return after it
I know how try, catch & finally work (for most part), but I have one thing I was wondering: what happens with a return statement after a try-catch-finally, while we already had a return in the try (or catch)?
For example:
public boolean…
Kevin Cruijssen
- 9,153
- 9
- 61
- 135
26
votes
5 answers
Curious C# using statement expansion
I've run ildasm to find that this:
using(Simple simp = new Simple())
{
Console.WriteLine("here");
}
generates IL code that is equivalent to this:
Simple simp = new Simple();
try
{
Console.WriteLine("here");
…
Matthew
- 261
- 3
- 3