Simplify boolean expressions

client/src/main/java/com/vaadin/client/DateTimeService.java

 
     public static int getNumberOfDaysInMonth(Date date) {
         final int month = date.getMonth();
-        if (month == 1 && true == isLeapYear(date)) {
+        if (month == 1 && isLeapYear(date)) {
             return 29;
         }
         return maxDaysInMonth[month];

client/src/main/java/com/vaadin/client/VTooltip.java

             Element element = Element.as(event.getEventTarget());
 
             // We can ignore move event if it's handled by move or over already
-            if (currentElement == element && handledByFocus == true) {
+            if (currentElement == element && handledByFocus) {
                 return;
             }
 

client/src/main/java/com/vaadin/client/ui/dd/VOr.java

         for (int i = 0; i < childCount; i++) {
             VAcceptCriterion crit = VAnd.getCriteria(drag, configuration, i);
             crit.accept(drag, configuration.getChildUIDL(i), this);
-            if (accepted == true) {
+            if (accepted) {
                 callback.accepted(drag);
                 return;
             }

client/src/main/java/com/vaadin/client/widgets/Grid.java

          *             if the editor handler is not set
          */
         public void setEnabled(boolean enabled) {
-            if (enabled == false && state != State.INACTIVE) {
+            if (!enabled && state != State.INACTIVE) {
                 throw new IllegalStateException(
                         "Cannot disable: editor is in edit mode");
-            } else if (enabled == true && getHandler() == null) {
+            } else if (enabled && getHandler() == null) {
                 throw new IllegalStateException(
                         "Cannot enable: EditorHandler not set");
             }

compatibility-client/src/main/java/com/vaadin/v7/client/widgets/Grid.java

          *             if the editor handler is not set
          */
         public void setEnabled(boolean enabled) {
-            if (enabled == false && state != State.INACTIVE) {
+            if (!enabled && state != State.INACTIVE) {
                 throw new IllegalStateException(
                         "Cannot disable: editor is in edit mode");
-            } else if (enabled == true && getHandler() == null) {
+            } else if (enabled && getHandler() == null) {
                 throw new IllegalStateException(
                         "Cannot enable: EditorHandler not set");
             }

compatibility-server/src/main/java/com/vaadin/v7/data/util/MethodProperty.java

             }
             if (j == c.length) {
 
-                // all paramteters matched
-                if (found == true) {
+                // all parameters matched
+                if (found) {
                     throw new MethodException(this,
                             "Could not uniquely identify " + getMethodName
                                     + "-method");
                 }
             }
         }
-        if (found != true) {
+        if (!found) {
             throw new MethodException(this,
                     "Could not find " + getMethodName + "-method");
         }
                 if (j == c.length) {
 
                     // all parameters match
-                    if (found == true) {
+                    if (found) {
                         throw new MethodException(this,
                                 "Could not identify unique " + setMethodName
                                         + "-method");
                     }
                 }
             }
-            if (found != true) {
+            if (!found) {
                 throw new MethodException(this,
                         "Could not identify " + setMethodName + "-method");
             }

compatibility-server/src/main/java/com/vaadin/v7/ui/NativeSelect.java

     @Override
     public void setMultiSelect(boolean multiSelect)
             throws UnsupportedOperationException {
-        if (multiSelect == true) {
+        if (multiSelect) {
             throw new UnsupportedOperationException(
                     "Multiselect not supported");
         }
     @Override
     public void setNewItemsAllowed(boolean allowNewOptions)
             throws UnsupportedOperationException {
-        if (allowNewOptions == true) {
+        if (allowNewOptions) {
             throw new UnsupportedOperationException(
                     "newItemsAllowed not supported");
         }

server/src/main/java/com/vaadin/server/JsonPaintTarget.java

 
         @Override
         public String getJsonPresentation() {
-            return "\"" + name + "\":" + (value == true ? "true" : "false");
+            return "\"" + name + "\":" + (value ? "true" : "false");
         }
 
     }