Refactor .gitignore and MyTransformer.java

- Refactor .gitignore to include Java and IntelliJ IDEA generated files, and miscellaneous files.
- Update MyTransformer.java to intercept the return value of the getAge() method in the Example class.

.gitignore

@@ -1,2 +1,9 @@
+# Compiled source
 **/out/
-**.jar
+# Java
+**.jar
+# Intellij idea generated files
+.idea
+*.iml
+# misc
+*.zip

agent/src/myagent/MyTransformer.java

@@ -18,14 +18,28 @@ public byte[] transform(ClassLoader loader,
             Class<?> classBeingRedefined,
             ProtectionDomain protectionDomain,
             byte[] classfileBuffer) throws IllegalClassFormatException {
-        if (className.equals("theapp/HelloWorld")) {
+        if (className.equals("theapp/Example")) {
             try {
                 ClassPool cp = ClassPool.getDefault();
-                CtClass cc = cp.makeClass(
-                    new ByteArrayInputStream(classfileBuffer)
-                );
-                CtMethod m = cc.getDeclaredMethod("main");
-                m.setBody("{ System.out.println(\"Bye, Bye! 🖐️\");}");
+                CtClass cc = cp.makeClass(new ByteArrayInputStream(classfileBuffer));
+                CtMethod getAgeMethod = cc.getDeclaredMethod("getAge");
+
+                // Add code to intercept the return value
+                getAgeMethod.insertBefore("{ System.out.println(\"Intercepted getAge()\"); }");
+                getAgeMethod.insertAfter("{ System.out.println(\"Return value: \" + $_); }");
+                // CtMethod m = cc.getDeclaredMethod("main");
+                // m.insertBefore("{ System.out.println(\"Hello, World! 🌍\");}");
+                // m.insertAfter("{ System.out.println(\"Bye, Bye! 🖐️🖐️\");}");
+                // classfileBuffer = cc.toBytecode();
+
+//                CtMethod myFunction = cc.getDeclaredMethod("myFunction");
+//                myFunction.insertBefore("{ System.out.println(\"Calling myFunction with third = \" + $3 ); }");
+//                myFunction.insertBefore("{ System.out.println(\"Calling myFunction with second = \" + $2 ); }");
+//                myFunction.insertBefore("{ System.out.println(\"Calling myFunction with first = \" + $1 ); }");
+//
+//                // Insert code after the original method call
+//                myFunction.insertAfter("{ System.out.println(\"Result: \" + $_); }");
+
                 classfileBuffer = cc.toBytecode();
             } catch (IOException e) {
                 e.printStackTrace();
@@ -37,6 +51,7 @@ public byte[] transform(ClassLoader loader,
                 e.printStackTrace();
             }
         }
+        System.out.println(className);
         return classfileBuffer;
     }
 }

helloworldapp/src/HelloWorld.java

@@ -1,7 +1,24 @@
 package theapp;
+class Example{
+    private final int age;
+    public Example(int age){
+        this.age = age;
+    }
 
+    public int getAge(){
+        return age;
+    }
+}
 class HelloWorld {
+
+    public static String myFunction(int x, int y, String z) {
+        return String.valueOf(x + y) + "_" + z;
+    }
+
     public static void main(String []args) {
         System.out.println("Hello World! 👀");
+        Example example = new Example(25);
+        int age = example.getAge();
+        System.out.println("Hi my Age is " + age);
     }
 }