Flow Control and Exception Handling - try-catch-finally

Syntax (JPL pg155)

try {
    statements;
} catch (exceptionType1 identifier1) {      // one or multiple
    statements;                 
} catch (exceptionType2 identifier2) {
    statements;
}    
...
} finally {                                 // one or none
    statements;
}

• must include either one catch clause or a finally clause
• can be multiple catch clauses but only one finally clause
• the try statements are executed until an exception is thrown or it completes successfully

• a compile-error occurs if the code included in the try statement will never throw one of the caught checked exceptions (runtime exceptions never need to be caught)
• if an exception is thrown, each catch clause is inspected in turn for a type to which the exception can be assigned; be sure to order them from most specific to least specific
• when a match is found, the exception object is assigned to the identifier and the catch statements are executed
• if no matching catch clause is found, the exception percolates up to any outer try block that may handle it
• a catch clause may throw another exception

• if a finally clause is included, it's statements are executed after all other try-catch processing is complete
• the finally clause executes wether or not an exception is thrown or a break or continue are encountered

Example Code

• Example code from Java 2 Certification
• Some other exception handling code
• Jaworski Exam Question 14, Chapter 5
• Jaworski Exam Question 15, Chapter 5