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perl script perl script 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. 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.

perl script 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. This can include three to five parts. First is an optional access specifier which can be public, private or protected. A public method can be called from pretty much anywhere.

perl script A private method can only be used within the class where it is defined. A protected method can be used anywhere within the package in which it is defined. Methods that aren't specifically declared public or private are protected by default.Next we decide whether the method is or is not static. Static methods have only one instance per class rather than one instance per object.

perl script All objects of the same class share a single copy of a static method. By default methods are not static.Next we specify the return type. This is the value that will be sent back to the calling method when all calculations inside the method are finished. If the return type is int, for example, we can use the method anywhere we use a constant integer.

perl script

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perl script