BAEL-3635 Intro to Alibaba Arthas

Adding a case study to show Arthas.

libraries-3/src/main/java/com/baeldung/arthas/FibonacciGenerator.java

@@ -0,0 +1,25 @@
+package com.baeldung.arthas;
+
+import java.io.IOException;
+
+import static java.lang.String.format;
+
+public class FibonacciGenerator {
+
+    public static void main(String[] args) throws IOException {
+        System.out.println("Press a key to continue");
+        System.in.read();
+        for (int i = 0; i < 100; i++) {
+            long result = fibonacci(i);
+            System.out.println(format("fib(%d): %d", i, result));
+        }
+    }
+
+    public static long fibonacci(int n) {
+        if (n == 0 || n == 1) {
+            return 1L;
+        } else {
+            return fibonacci(n - 1) + fibonacci(n - 2);
+        }
+    }
+}