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imap email out.println() method actually requires quite a lot of code, but it is all stored for us in the System libraries. Thus rather than including that code every time we need to print, we just call the System.out.println() method.

imap email 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. 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.

imap email 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. We can add the rest of the code in smaller, easier-to-understand pieces.

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