What happens if an exception does not have a matching catch clause?
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Exception Handling in JavaWhat is an Exception?An exception is an object that represents an error or an exceptional situation that has occurred
Exception categories in JavaJava has two primary kinds of exceptions
When to use Exceptions
How do you do exception handling?The process involves:
Claiming ExceptionsIn a Java method claim an exception with the keyword throws. This goes at the end of the method's prototype and before the definition. Multiple exceptions can be claimed, with a comma-separated list. Examples: public void myMethod() throws IOException public void yourMethod() throws IOException, AWTException, BobExceptionThrowing ExceptionsIn Java, use the keyword throw, along with the type of exception being thrown. An exception is an object, so it must be created with the new operator. It can be created within the throw statement or before it. Examples: throw new BadHairDayException(); MyException m = new MyException(); throw m; if (personOnPhone != bubba) throw new Exception("Stranger on the phone!!"); Note that this is different than the keyword throws, which is used in claiming exceptions.Catching ExceptionsKeywords: try, catch, finally
Trivial Example
Example Layout -- try, catch, finallytry { // lots of IO code opening and reading from/to files } catch (FileNotFoundException) { // tell the user and probably repeat try block } catch (EOFException) { // hit the End Of File marker early } catch (IOException) { // blanket catch for all other IO problems } finally { // make sure to close any files that might be open }What happens if an exception is not caught?
Instance methods in exception objectsException objects are created from classes, which can have instance methods. There are some special instance methods that all exception objects have (inherited from Throwable):
Deitel code examples in Chapter 13 folderException Handling in C++While the concepts are largely the same, the syntax differs a little
What happens if an exception does not have a matching catch clause?If an exception does not have a matching catch clause, the current method terminates and throws the exception to the next higher level. If there is no matching catch clause at any higher level, then the program terminates with an error. Your program can do anything with the exception object that it chooses to. What will happen if an exception is thrown for which no matching catch () block is defined?If there is no catch block at the current scope matching the thrown exception, the current scope is exited, and all automatic (local nonstatic) objects defined in that scope are destroyed. The surrounding scope (which might be function scope) is checked for a matching handler. What happens if an exception is thrown in a try block?If an exception is thrown inside the try-block, for instance from the divide method, the program flow of the calling method, callDivide, is interrupted just like the program flow inside divide. The program flow resumes at a catch-block in the call stack that can catch the thrown exception. What will happen if an exception is thrown and there is no catch block to deal with it in Java?if you don't handle exceptions When an exception occurred, if you don't handle it, the program terminates abruptly and the code past the line that caused the exception will not get executed. What happens with an exception which does not get caught?What happens if an exception is not caught? If an exception is not caught (with a catch block), the runtime system will abort the program (i.e. crash) and an exception message will print to the console.
What will happen if an exception is thrown for which no matching catch block is defined?If there is no catch block at the current scope matching the thrown exception, the current scope is exited, and all automatic (local nonstatic) objects defined in that scope are destroyed. The surrounding scope (which might be function scope) is checked for a matching handler.
When using try catch what happens when an exception is thrown but there is no matching catch for the exception?Each try must have at least one corresponding catch or finally block. If an exception is thrown and its current function scope has no catch block, the exception will "bubble up" the call stack to the calling function until it finds a matching catch block. All finally blocks it encounters along the way will be executed.
What happens if a try catch finally statement does not have a catch clause to handle an exception that is thrown within the body of the try statement?If an exception is thrown from the try block, even when there's no catch block to handle the exception, the finally block still executes, in which case the exception is still thrown immediately after the finally block finishes executing. The following example shows one use case for the finally -block.
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