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site studio 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.lang.ArrayIndexOutOfBoundsException at Hello.
site studio 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."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.
site studio 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. 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.
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