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web site web site java:7)What happened was that since we didn't give Hello any command line arguments there wasn't anything in args[0]. Therefore Java kicked back this not too friendly error message about an "ArrayIndexOutOfBoundsException."Previously we fixed this problem by testing the length of the array before we tried to access its first element. This worked well in this simple case, but this is far from the only such potential problem. If you were to check for every possible error condition in each line of code, you would find your code becoming bloated with more error checking than actual code.

web site Moreover you then have to start checking for errors in the error conditions. In older languages like C, Basic and Fortran you sooner or later you find yourself resorting to goto or longjmp or other such ingredients in the recipe for illegible Spaghetti CodeThe goal of exception handling is to be able to define the regular flow of the program in part of the code without worrying about all the special cases. Then, in a separate block of code, you cover the exceptional cases. This produces more legible code since you don't need to interrupt the flow of the algorithm to check and respond to every possible strange condition. The runtime environment is responsible for moving from the regular program flow to the exception handlers when an exceptional condition arises.

web site 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.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.

web site 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. 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.

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