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site studio site studio The runtime environment is responsible for moving from the regular program flow to the exception handlers when an exceptional condition arises.In practice what you do is write blocks of code that may generate exceptions inside try-catch blocks. You try the statements that generate the exceptions. Within your try block you are free to act as if nothing has or can go wrong. Then, within one or more catch blocks, you write the program logic that deals with all the special cases.

site studio Here's an example of exception handling in Java using the Hello World program above:// This is the Hello program in Java class ExceptionalHello { public static void main (String args[]) { /* Now let's say hello */ try { System.out.println("Hello " + args[0]); } catch (Exception e) { System.out.println("Hello whoever you are"); } }} Some exceptions need to be caught and dealt with while others are generally considered to be so horrific that the runtime system, just gives up.

site studio The compiler will complain if you write code that doesn't watch out for the not-too-dangerous exceptions, but you'll need to watch out for the really dangerous ones (like ArrayIndexOutOfBoundsExceptions) yourself.Sometimes catching an exception can feel like a little yippy dog that finally catches a car. Now that it's got hold of the bumper between its teeth, what is it going to do with it? Many times there may not be much you can do. Bad exceptions stop the program by default. This is at least preferable to unhandled exceptions in most programming languages where the entire system can come crashing down around your feet with a core dump or worse.

site studio Sometimes you may want to this too. In that case you can call the System.exit(int) method to halt your running program. Other times you may just break out of a loop you were in and continue with the rest of your code. This is most common when an exception isn't really unexpected or when it doesn't badly affect your program logic.

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