Mô hình thực hiện của giao diện ServletContext. Có thể được sử dụng để thử nghiệm các servlet. Mô hình thực hiện của giao diện RequestDispatcher. Có thể được sử dụng để kiểm tra các servlet và các bộ điều khiển. Thực hiện mô hình của các | 22 Part I Introduction to C Programming After you reedit your source code file you have to recompile to re-create the program file. That is how you fix an error or modify the program. If you re programming in an IDE Integrated Development Environment such as Dev-C or Microsoft Visual C you may need to use a Rebuild or Rebuild All command to create a new program after modifying your source code. If you see any errors after recompiling you must re-reedit your source code and then re-recompile again. You only reedit and recompile no sense in getting re-happy. Dealing with the Heartbreak of Errors Errors happen. Even the best of programmers get errors from the innocent code-writing cog at Microsoft to the sneering snooty Linux programmer whose only contact with humanity is the pizza guy they all get errors. Every day. Errors are nothing to be embarrassed about. Consider them learning tools or gentle reminders. That s because the compiler tells you with uncanny accuracy just what the error is and where it is. Contrast this with your most nightmarish math class The wicked pedant would write only WRONG next to your calculations no matter how innocent a mistake you made. Yes computers can be forgiving and this can even teach you something. Yikes An error But before you shoot yourself. Here is a new program . Note the optimism in its name. It s a flawed C program one that contains an error albeit an on-purpose error include int main printfCThis program will err. n return 0 Type the source code exactly as it appears here. Do not use the source code as a base start over here with a clean editor window. When you re done entering the source code save it to disk as . Compile it and then. __Chapter 2 C of Sorrow C of Woe 23 Unfortunately when you compile this program it produces an error. The next section provides the autopsy. Pay careful attention as you type Each little oddball character and nutty .
