Use operator assignments where possible

Change-Id: I80b73b653e97904605dc62484a7448f3bfbf7212

6 files changed, 8 insertions, 8 deletions

diff --git a/server/src/main/java/com/vaadin/server/VaadinPortletSession.java b/server/src/main/java/com/vaadin/server/VaadinPortletSession.java
index 6a6cb429d3..f1b32efabe 100644
--- a/server/src/main/java/com/vaadin/server/VaadinPortletSession.java
+++ b/server/src/main/java/com/vaadin/server/VaadinPortletSession.java
@@ -286,7 +286,7 @@ public class VaadinPortletSession extends VaadinSession {
         if (response instanceof MimeResponse) {
             String actionKey = "" + System.currentTimeMillis();
             while (eventActionDestinationMap.containsKey(actionKey)) {
-                actionKey = actionKey + ".";
+                actionKey += ".";
             }
             PortletURL actionUrl = generateActionURL(actionKey);
             if (actionUrl != null) {
@@ -336,7 +336,7 @@ public class VaadinPortletSession extends VaadinSession {
         if (response instanceof MimeResponse) {
             String actionKey = "" + System.currentTimeMillis();
             while (sharedParameterActionNameMap.containsKey(actionKey)) {
-                actionKey = actionKey + ".";
+                actionKey += ".";
             }
             PortletURL actionUrl = generateActionURL(actionKey);
             if (actionUrl != null) {
diff --git a/server/src/main/java/com/vaadin/server/VaadinServlet.java b/server/src/main/java/com/vaadin/server/VaadinServlet.java
index a2bf4fd5b0..d43db5c303 100644
--- a/server/src/main/java/com/vaadin/server/VaadinServlet.java
+++ b/server/src/main/java/com/vaadin/server/VaadinServlet.java
@@ -789,7 +789,7 @@ public class VaadinServlet extends HttpServlet implements Constants {
             // Remove milliseconds to avoid comparison problems (milliseconds
             // are not returned by the browser in the "If-Modified-Since"
             // header).
-            lastModifiedTime = lastModifiedTime - lastModifiedTime % 1000;
+            lastModifiedTime -= lastModifiedTime % 1000;
             response.setDateHeader("Last-Modified", lastModifiedTime);
 
             if (browserHasNewestVersion(request, lastModifiedTime)) {
@@ -1360,7 +1360,7 @@ public class VaadinServlet extends HttpServlet implements Constants {
 
         if (servletPath.length() == 0
                 || servletPath.charAt(servletPath.length() - 1) != '/') {
-            servletPath = servletPath + "/";
+            servletPath += "/";
         }
         URL u = new URL(reqURL, servletPath);
         return u;
diff --git a/server/src/main/java/com/vaadin/ui/Grid.java b/server/src/main/java/com/vaadin/ui/Grid.java
index 490f9bf8f2..6d2b2518b0 100644
--- a/server/src/main/java/com/vaadin/ui/Grid.java
+++ b/server/src/main/java/com/vaadin/ui/Grid.java
@@ -2529,7 +2529,7 @@ public class Grid<T> extends AbstractSingleSelect<T> implements HasComponents {
 
     private String getGeneratedIdentifier() {
         String columnId = "generatedColumn" + counter;
-        counter = counter + 1;
+        counter++;
         return columnId;
     }
 
diff --git a/server/src/main/java/com/vaadin/ui/declarative/Design.java b/server/src/main/java/com/vaadin/ui/declarative/Design.java
index 8ac0ef41a8..54abc38427 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/Design.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/Design.java
@@ -261,7 +261,7 @@ public class Design implements Serializable {
                         .toLowerCase(Locale.ENGLISH);
                 context.addPackagePrefix(prefix, packageName);
             }
-            prefix = prefix + "-";
+            prefix += "-";
             String className = classNameToElementName(
                     componentClass.getSimpleName());
             String tagName = prefix + className;
diff --git a/server/src/test/java/com/vaadin/data/BeanBinderInstanceFieldTest.java b/server/src/test/java/com/vaadin/data/BeanBinderInstanceFieldTest.java
index c202dbb47f..d04789f353 100644
--- a/server/src/test/java/com/vaadin/data/BeanBinderInstanceFieldTest.java
+++ b/server/src/test/java/com/vaadin/data/BeanBinderInstanceFieldTest.java
@@ -375,7 +375,7 @@ public class BeanBinderInstanceFieldTest {
         Assert.assertEquals(ageField, form.noFieldInPerson);
 
         form.firstName.setValue("aa");
-        age = age + 56;
+        age += 56;
         form.noFieldInPerson.setValue(String.valueOf(age));
 
         Assert.assertEquals(personName, person.getFirstName());
diff --git a/server/src/test/java/com/vaadin/tests/server/navigator/NavigatorTest.java b/server/src/test/java/com/vaadin/tests/server/navigator/NavigatorTest.java
index 7b160106d8..1a1d15edcf 100644
--- a/server/src/test/java/com/vaadin/tests/server/navigator/NavigatorTest.java
+++ b/server/src/test/java/com/vaadin/tests/server/navigator/NavigatorTest.java
@@ -894,7 +894,7 @@ public class NavigatorTest {
             @Override
             protected void navigateTo(View view, String viewName,
                     String parameters) {
-                count[0] = count[0] + 1;
+                count[0] += 1;
                 super.navigateTo(view, viewName, parameters);
             }
         };