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13: } 14: 15: // More code here
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As before, execution starts at the first line of the try block, line 2. If there are no exceptions thrown in the try block, execution transfers to line 11, the first line of the finally block. On the other hand, if a MySecondException is thrown while the code in the try block is executing, execution transfers to the first line of that exception handler, line 8 in the catch clause. After all the code in the catch clause is executed, the program moves to line 11, the first line of the finally clause. Repeat after me: finally always runs ! OK, we ll have to refine that a little, but for now, start burning in the idea that finally always runs. If an exception is thrown, finally runs. If an exception is not thrown, finally runs. If the exception is caught, finally runs. If the exception is not caught, finally runs. Later we ll look at the few scenarios in which finally might not run or complete. finally clauses are not required. If you don t write one, your code will compile and run just fine. In fact, if you have no resources to clean up after your try block completes, you probably don t need a finally clause. Also, because the compiler doesn t even require catch clauses, sometimes you ll run across code that has a try block immediately followed by a finally block. Such code is useful when the exception is going to be passed back to the calling method, as explained in the next section. Using a finally block allows the cleanup code to execute even when there isn t a catch clause. The following legal code demonstrates a try with a finally but no catch:
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try { // do stuff } finally { //clean up }
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The following legal code demonstrates a try, catch, and finally:
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try { // do stuff } catch (SomeException ex) { // do exception handling } finally { // clean up }
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4: Flow Control, Exceptions, and Assertions
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The following illegal code demonstrates a try without catch or finally:
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try { // do stuff } System.out.println("out of try block"); // need a catch or finally here
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The following illegal code demonstrates a misplaced catch block:
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try { // do stuff } System.out.println("out of try block"); catch(Exception ex) { }
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// can't have code between try/catch
It is illegal to use a try clause without either a catch clause or a finally clause. A try clause by itself will result in a compiler error. Any catch clauses must immediately follow the try block. Any finally clauses must immediately follow the last catch clause. It is legal to omit either the catch clause or the finally clause, but not both. You can t sneak any code in between the try and catch (or try and finally) blocks. The following won t compile:
try { // do stuff } System.out.print( below the try ); catch(Exception ex) { }
//Illegal!
Propagating Uncaught Exceptions
Why aren t catch clauses required What happens to an exception that s thrown in a try block when there is no catch clause waiting for it Actually, there s no requirement that you code a catch clause for every possible exception that could be thrown from the corresponding try block. In fact, it s doubtful that you could accomplish such a feat! If a method doesn t provide a catch clause for a particular exception, that method is said to be ducking the exception (or passing the buck ).
Handling Exceptions (Exam Objectives 2.3 and 2.4)
So what happens to a ducked exception Before we discuss that, we need to briefly review the concept of the call stack. Most languages have the concept of a method stack or a call stack. Simply put, the call stack is the chain of methods that your program executes to get to the current method. If your program starts in method main() and main() calls method a(), which calls method b() that in turn calls method c(), the call stack consists of the following:
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