Fibonnaci.java.

Enterprise Java
Tag Libraries: JSPs in the Enterprise
by Dion Almaer
Listing 3. Fibonnaci.java.


package com.customware.fib;

public class Fibonnaci {

   // Method to calculate the fibonacci sequence
   public int calculateFibonacci( int num ) {

      if (num <= 0) return 0;
      if (num == 1) return 1;

      int previous1 = 1, previous2 = 0, fib = 0;

      for (int i=2; i <= num; i++) {
          // the fib is the answer of the previous two answers
          fib = previous1 + previous2;

          // reset the previous values
          previous2 = previous1;
          previous1 = fib;
      }

      return fib;
   }

   public int[] calculateFibonacciRange(int start, int stop) {
      int[] results = new int[stop + 1];

      for (int x=start; x <= stop; x++) {
          results[x] = this.calculateFibonacci( x );
      }
      return results;
   }
}

About the Author

Dion Almaer is a senior consultant for CustomWare in Boulder, CO. He can be reached at dion@customware.com.

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