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FIbonacci.java

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+class Fibonacci {
+    public int Fib(int n) {
+        if (n == 0) {
+            return 0;
+        } else if (n == 1) {
+            return 1;
+        }
+
+        int first = 0;
+        int second = 1;
+
+        for (int i = 2; i <= n; i++) {
+            int third = first + second;
+            first = second;
+            second = third;
+        }
+        return second;
+    }
+
+    public static void main(String[] args) {
+        Fibonacci f = new Fibonacci();
+        int result = f.Fib(5);
+        System.out.println("Fibonacci number : " + result);
+    }
+}