diff --git a/java/src/main/java/it/tug/Main/AskResult.java b/java/src/main/java/it/tug/Main/AskResult.java
new file mode 100644
index 0000000..6eec8e0
--- /dev/null
+++ b/java/src/main/java/it/tug/Main/AskResult.java
@@ -0,0 +1,11 @@
+package it.tug.Main;
+
+public abstract class AskResult {
+  public AskResult onOk(PermissionAction action) {
+    return this;
+  }
+
+  public AskResult onFail(PermissionAction action) {
+    return this;
+  }
+}
diff --git a/java/src/main/java/it/tug/Main/FailAskResult.java b/java/src/main/java/it/tug/Main/FailAskResult.java
new file mode 100644
index 0000000..06b2eac
--- /dev/null
+++ b/java/src/main/java/it/tug/Main/FailAskResult.java
@@ -0,0 +1,9 @@
+package it.tug.Main;
+
+public class FailAskResult extends AskResult {
+  @Override
+  public AskResult onFail(PermissionAction action){
+    action.execute();
+    return this;
+  }
+}
diff --git a/java/src/main/java/it/tug/Main/Formatter.java b/java/src/main/java/it/tug/Main/Formatter.java
index 92d91c6..8d59090 100644
--- a/java/src/main/java/it/tug/Main/Formatter.java
+++ b/java/src/main/java/it/tug/Main/Formatter.java
@@ -3,20 +3,26 @@
 public class Formatter {
 
     private Service service;
+    private String doTheJobResult;
 
     public Formatter(Service service) {
         this.service = service;
     }
 
     public String doTheJob(String theInput) {
-        String response = service.askForPermission();
-        switch (response) {
-            case "FAIL":
-                return "error";
-            case "OK":
-                return String.format("%s%s", theInput, theInput);
-            default:
-                return null;
-        }
+        final String localInput = theInput;
+        service
+          .askForPermission()
+          .onFail(new PermissionAction() {
+            public void execute(){
+              doTheJobResult = "error";
+            }
+          })
+          .onOk(new PermissionAction() {
+            public void execute(){
+              doTheJobResult = String.format("%s%s", localInput, localInput);
+            }
+          });
+        return doTheJobResult;
     }
 }
diff --git a/java/src/main/java/it/tug/Main/OkAskResult.java b/java/src/main/java/it/tug/Main/OkAskResult.java
new file mode 100644
index 0000000..b8ffd84
--- /dev/null
+++ b/java/src/main/java/it/tug/Main/OkAskResult.java
@@ -0,0 +1,9 @@
+package it.tug.Main;
+
+public class OkAskResult extends AskResult {
+  @Override
+  public AskResult onOk(PermissionAction action) {
+    action.execute();
+    return this;
+  }
+}
diff --git a/java/src/main/java/it/tug/Main/PermissionAction.java b/java/src/main/java/it/tug/Main/PermissionAction.java
new file mode 100644
index 0000000..3c510e5
--- /dev/null
+++ b/java/src/main/java/it/tug/Main/PermissionAction.java
@@ -0,0 +1,5 @@
+package it.tug.Main;
+
+public interface PermissionAction {
+  void execute();
+}
diff --git a/java/src/main/java/it/tug/Main/Service.java b/java/src/main/java/it/tug/Main/Service.java
index 8845681..7ab6b25 100644
--- a/java/src/main/java/it/tug/Main/Service.java
+++ b/java/src/main/java/it/tug/Main/Service.java
@@ -1,5 +1,5 @@
 package it.tug.Main;
 
 public interface Service {
-    String askForPermission();
+  AskResult askForPermission();
 }
diff --git a/java/src/test/java/it/tug/FormatterTest.java b/java/src/test/java/it/tug/FormatterTest.java
index e568f67..ede3c33 100644
--- a/java/src/test/java/it/tug/FormatterTest.java
+++ b/java/src/test/java/it/tug/FormatterTest.java
@@ -3,8 +3,7 @@
 import static org.junit.Assert.assertEquals;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
-import it.tug.Main.Formatter;
-import it.tug.Main.Service;
+import it.tug.Main.*;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -19,31 +18,34 @@ public void setup() {
         service = mock(Service.class);
         sut = new Formatter(service);
     }
-    
+
     @Test
     public void shouldReturnAnErrorMessageIfServiceReturnsNull() {
-        when(this.service.askForPermission()).thenReturn("FAIL");
-        
+        when(this.service.askForPermission())
+          .thenReturn(new FailAskResult());
+
         String actual = sut.doTheJob("foo");
-        
+
         assertEquals("error", actual);
     }
 
     @Test
     public void shouldReturnAnTheStringDoubledIfServiceReturnsOK() {
-        when(this.service.askForPermission()).thenReturn("OK");
-        
+        when(this.service.askForPermission())
+          .thenReturn(new OkAskResult());
+
         String actual = sut.doTheJob("foobar");
-        
+
         assertEquals("foobarfoobar", actual);
     }
-    
+
     @Test
     public void shouldReturnNullIfServiceRepliesDifferentlyThanOKOrFAIL() {
-        when(this.service.askForPermission()).thenReturn("luchino");
-        
+        when(this.service.askForPermission())
+          .thenReturn(new AskResult(){});
+
         String actual = sut.doTheJob("foobar");
-        
+
         assertEquals(null, actual);
     }
 }