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low cost jsp server Catching ExceptionsDo you remember this code?// This is the Hello program in Java class Hello { public static void main (String args[]) { /* Now let's say hello */ System.out.print("Hello "); System.out.println(args[0]); }}Do you remember what happened when you ran the program without giving it any command line arguments? The runtime system generated an exceptionException in thread "main" java.
low cost jsp server lang.ArrayIndexOutOfBoundsException at Hello.main(C:\javahtml\Hello.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.
low cost jsp server "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. 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.
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