|
||
|
Lesson 10
Objective
|
The finally keyword in Java
Code that uses the finally keyword. |
|
|
Determine the results of a block of code that uses the finally keyword.
Before we leave our topic of exceptions, we need to cover one tenacious keyword called finally.
The finally keyword is a strange animal. If you're used to a certain flow of control, get ready for a jolt when you use finally.
A finally block of code can be defined after a try, as in: try { // do something } finally { // always do this, no matter what! }
What do we mean by no matter what? Even if you break, return, or throw an exception in the try block, the finally code will always, and
we mean always, be executed. Here's some code that illustrates how you might define a finally block:
class Tenacious { public static void main(String[] args) { try { myMethod1(); myMethod2(); myMethod3(); } catch (Exception e) { System.out.println("Catching exception"); } } // ----- myMethod1() static void myMethod1() { try { return; } finally { System.out.println("Attempted Return"); } } // ----- myMethod2() static void myMethod2() { top: try { break top; } finally { System.out.println("Attempted break"); } // End Finally } // ----- myMethod3() static void myMethod3() throws Exception { try { throw(new Exception()); } finally { System.out.println("Attempted to throw an exception"); } } } we tried to return we tried to break we tried to throw an exception Catching exception
This quiz pertains to the finally keyword previously discussed.
Finally Keyword Quiz |
||
|
|
||
