diff --git a/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/swing/windows/MainWindow.java b/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/swing/windows/MainWindow.java
index 2942d9d..38329a2 100644
--- a/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/swing/windows/MainWindow.java
+++ b/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/swing/windows/MainWindow.java
@@ -107,13 +107,8 @@ public class MainWindow extends TWindow {
     
 
     {
-        ChangeListener valueMustBeTime = new ChangeListener() {
-            @Override
-            public void changed(Property property, Object oldValue,
-                    Object newValue) {
-                new TTime((String) newValue);
-            }
-        };
+        ChangeListener valueMustBeTime =
+                (property, oldValue, newValue) -> new TTime((String) newValue);
         this.arrivalTextField = new TTextField(Constants.DEFAULT_ARRIVAL_TIME, 40, true,valueMustBeTime);
         this.overtimeTextField = new TTextField(Constants.DEFAULT_OVERTIME, 40, true,valueMustBeTime);
         this.workingTimeTextField = new TTextField("08:00", 40, true,valueMustBeTime);