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research:software:reflex:documentation:the_fibonacci_example [2007/07/30 01:55] – created adminresearch:software:reflex:documentation:the_fibonacci_example [2007/08/24 20:53] (current) – rtoledo
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 +====== The Fibonacci Example ======
  
 +As a base for the illustrations presented later in this chapter, we will use a simple utility class able to calculate fibonacci numbers.
 +
 +
 +The [[http://reflex.dcc.uchile.cl/svn/base/trunk/src/reflex/examples/fibonacci/app/Fibonacci.java|code]] of the class is:
 +
 +<code java>
 +  public class Fibonacci{
 +
 +      public Fibonacci(){ }
 +
 +      public long get(int n){
 +          if (n == 0 || n == 1){
 +              return (long) n;
 +          }
 +
 +          return get(n - 1) + get(n - 2);
 +      }
 +
 +      public static void main(String[] args){
 +          if (args.length == 0){
 +              System.out.println("Please specify which fibonacci number
 +              should be calculated.");
 +              System.exit(0);
 +          }
 +
 +          int theN = Integer.parseInt(args[0]);
 +
 +          long theFibonacciNumber = new Fibonacci().get(theN);
 +          System.out.println("The fibonacci[" + theN + "] is " + theFibonacciNumber);
 +
 +          System.out.println();
 +
 +          long theFibonacciNumberPlusOne = new Fibonacci().get(theN + 1);
 +          System.out.println("The fibonacci[" + (theN + 1) + "] is " +
 +                              theFibonacciNumberPlusOne);
 +      }
 +}
 +</code>
 +
 +This piece of code is pretty straightforward to read: there is one empty constructor to obtain Fibonacci objects references and one unique method to calculate a fibonacci number based on the parameter that represents the one we are interested on.