create a web server

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create a web server create a web server println() method.You can write and call your own methods too. Let's look at a simple example. Java has no built-in factorial method so we'll write one. The following is a simple program that requests a number from the user and then calculates the factorial of that number.

create a web server We'll use two methods in the program, one that checks to see if the user has in fact entered a valid positive integer, and another that calculates the factorial. However we'll start by writing the main method of the program:class Factorial { public static void main(String args[]) { int n; while ((n = getNextInteger()) >= 0) { System.out.println(factorial(n)); } } // main ends here}Among other things this code demonstrates that methods make it possible to design the flow of a program without getting bogged down in the details. We've simply named two methods, getNextInteger() and factorial() without worrying about their exact implementations.

create a web server We can add the rest of the code in smaller, easier-to-understand pieces. Let's write the factorial method first.long factorial (long n) { int i; long result=1; for (i=1; i <= n; i++) { result *= i; } return result;} // factorial ends here We could have included this code in our main method, but the algorithm is much easier to understand by breaking the code into smaller, more manageable pieces. It's also easier to test and debug. We can write a simple program that lets us test the factorial method before we worry ourselves with the much harder problem of accepting and validating user input.

create a web server Here's the test program:class FactorialTest { public static void main(String args[]) { int n; int i; long result; for (i=1; i <=10; i++) { result = factorial(i); System.out.println(result); } } // main ends here static long factorial (int n) { int i; long result=1; for (i=1; i <= n; i++) { result *= i; } return result;} // factorial ends here } C++ programmers should take note that both methods are defined inside the class definition. Once again we see that in Java everything belongs to a class.Let's take a closer look at the syntax of a method: static long factorial (int n) { int i; long result=1; for (i=1; i <= n; i++) { result *= i; } return result;}Methods begin with a declaration.

create a web server

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create a web server