Java How To Program, Late Objects, 11th Edition

... timeData = new TimeData();
59
60         System.out.printf("  Calculating fibonacci(%d)%n",  n);
61         timeData.start = Instant.now();
62         long fibonacciValue = fibonacci(n);
63         timeData.end = Instant.now();
64         displayResult(n, fibonacciValue, timeData);
65         return timeData;
66      }
67
68      // recursive method fibonacci; calculates nth Fibonacci number
69      private static long fibonacci(long n) {
70         if (n == 0 || n == 1) {
71            return n;
72         }
73         else {
74            return fibonacci(n - 1) + fibonacci(n - 2);
75         }
76      }
77
78      // display fibonacci calculation result and total calculation time
79      private static void displayResult(
80         int n, long value, TimeData timeData) {
81
82         System.out.printf("  fibonacci(%d) = %d%n",  n, value);
83         System.out.printf(
84            " Calculation time for fibonacci(%d) ...