Today's visit to the forum found a very interesting question:
Who can give me an explanation of the result of this procedure is: 2. Instead of: 3
The code is as follows:class Test {public int aaa() {int x = 1;try {return ++x;} catch (Exception e) {} finally {++x;}return x;}public static void main(String[] args) {Test t = new Test();int y = t.aaa();System.out.println(y);}}
After seeing the problem, the following questions were drawn
Tag:js the use of Try catch, JS fault tolerant processingUser answer: Try{//Normal execution}Catch(E/ * The type of error you feel will be wrong * /){//Accidents may occur eg: User's own operation error or function less condition does not affect the following function execution //Sometimes used in such as focus () but nasty IE might have the first time without the focus event and let him do it again.
Http://wenwen.soso.com/z/q175197035.htm
Try{...} There are some code that you think may be going wrong, catch is what you think will be a problem, if the problem is exactly what you said in the catch, then he will follow your set, such as will print out, such as the Exit method, etc. ... Then proceed down to the code that executes later.
But if you do not need to try{}, no problem, very good, a problem, th
Try{ //normal execute }catch(e/* The type of error you feel will be wrong */) { //////////////////////////) {/////// c11>//can sometimes be used for example focus () but nasty ie may be the first time without the focus event and then let him do it again //Sometimes some bug is not bug on IE he asked for a catch even if an empty catch had encountered this on the IE8 The Egg JS problem } The use of try
, Checkedexception exception in the compilation of theIt is possible to know that there will be no exceptions, and if these exceptions are not thrown or caught, they cannot be compiled, such as when reading a file using Java IO, there may beIf the file being read does not exist, for such compile-time exceptions, they must be manually processed (captured or thrown).Otherwise, the compiler does not work correctly. andRuntimeException is the exception that occurs when you are running, and you canno
Java in the use of try,catch,finally, previously felt familiar, but see a Bovencai have a deeper understanding of the summary of the blog is as follows.How to combine Java exception handling:1.try+catchRun the process: Run into the try block, and if an exception is thrown, go to the catch block to process it. Then execute the statement after the catch block2.
The examples in this article describe the use of Try catch exception capture mechanisms in JavaScript. Share to everyone for your reference, specific as follows:
1. Like Java, JavaScript also has a try catch block, which is the mechanism for exception capture.
(1) A typical try Catch statement
try{
}
catch{
}
http://blog.csdn.net/kavensu/article/details/8067850
Conclusion:1, regardless of the occurrence of wood anomalies, finally block code will be implemented;2. Finally still executes when there is return in try and catch;3, finally is after the return of the expression after the operation (at this time, not returning the value of the operation, but first to return the value to save, pipe finally in the code, the return of the value will not change, is
To use an unmanaged resource type, you must implement the idisposable interface's dispose () method to precisely release system resources .. This rule in the. NET environment causes the release of resources.Source codeIs a type of user, rather than a type or system. Therefore, whenever you use a type with the dispose () method, you have the responsibility to call the dispose () method to release resources. The best way to ensure that dispose () is to use the using statement or
Try Catch. I believe everyone has used it! In fact, I often use it because recently when I was working on a sharepoint-related project, I did not return null when calling its object method, but throw an exception message, there are a lot of try catch in the relative project! I often hear and see that Try on the Forum affects efficiency! Over time, I think so too!
As in other languages, in Python, thetry/except statement is primarily used to handle some exceptions that occur during normal execution of a program , such as syntax errors (Python is not compiled as a scripting language, and syntax is detected during execution. Exception message after an error), data except 0 errors, values that have never been defined, and so on, while the try/finally statement is mainly used to perform some cleanup work whether or
the original logic, so it can cause poor code readability.Try...except ... Exception handlingA python-customized exception handling class with the following syntax:1 try:2 code block 3 except exception type: 4 If an exception is detected in a try, the logic of this position is executed if the exception is the same as the except marked exceptionExample 1: iterator stopiteration exception handlingPre
Self-summary, what is insufficient or good plan, hope that we give correct, grateful!Purpose: Try catch finaly in the order of execution, and everyone review it again.Method: Debug to confirm the order of execution. (need to introduce junit packages)Needless to say, Debug is the only standard for verifying the Order of code execution, haha ...Test One:New test class: Exceptiontest Packagecom.core.test007;Importorg.junit.Test; Public classexceptiontest
The code is as follows:public class Example039 {public static void main (string[] args) {Example039 example039 = new Example039 (); System.out.println (EXAMPLE039.OUTPUT1 ()); Example039.output2 ();} Boolean output1 () {try {//... return true;} finally {return false;}} void Output2 () {try {System.out.println ("executes the contents of a try statement, then exits
Let's take a look at an example
Note that:
AddEventListener and attachevent difference in the first argument the former is click the latter is the onclick
AddEventListener is running in the element scope where the element is located
Attachevent Run in global scope (This=window)
Try ... Catch statement
Try...catch can test errors in your code. The try
Turn from: http://blog.csdn.net/kavensu/article/details/8067850
Directory:
Conclusion Example Final conclusion
ConclusionsThe code executes in the finally block, regardless of the occurrence of the wood, and finally still executes when there is return in the try and catch, and finally is executed after the expression operation after returning (at which point no value is returned after the operation). Instead of saving the value to be returned, the co
This article describes how to use the extension method to simplify the try Catch finally statement block into the following invocation form: Public void Test1 () { new Employee (); = p.work ()) = handleexception (e)) = p.rest ()); While this doesn't seem to save too much code, it looks a bit more neat. Here's how to do this:A. Try P
Try-catch-finallySpeaker: Wang Shaohua QQ Group No.: 483773664Learning Goals1, Master try-catch-finally2, Master try-catch-finally respectively with System.exit (1) and return with the use of precautionsFirst, finally Execution Process
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public class Test2 {public static void main(String[] args) {Scann
Scala Data interactionScala uses a functional way to manipulate data interactions, including the entry and return values.
Option: Resolve null (NULL pointer) issues
Either: Resolve return value indeterminate (one of two values returned) issue
Try: Resolving a function may throw an exception problem
Use of Option/some/noneOption actually has 3 types: option, some and none,some, and none are the subtypes of option, som
Try{}catch (Exception e) {}finally{}Java exception handling is common in programming, where statements that may throw exceptions are placed in try{}, and if an exception is thrown, the statement after the exception statement that is thrown in try{} is no longer executed. catch (Exception e) {} Fetches the exception and processes it, and if there is no exception,
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