Use single character for StringBuilder.append (#10102)

6 files changed, 16 insertions, 16 deletions

diff --git a/uitest/src/main/java/com/vaadin/tests/TestForStyledUpload.java b/uitest/src/main/java/com/vaadin/tests/TestForStyledUpload.java
index 790ee06c20..45f0bb47fe 100644
--- a/uitest/src/main/java/com/vaadin/tests/TestForStyledUpload.java
+++ b/uitest/src/main/java/com/vaadin/tests/TestForStyledUpload.java
@@ -161,12 +161,12 @@ public class TestForStyledUpload extends LegacyApplication
         if (up.isUploading()) {
             sb.append("Uploading...");
             sb.append(up.getBytesRead());
-            sb.append("/");
+            sb.append('/');
             sb.append(up.getUploadSize());
-            sb.append(" ");
+            sb.append(' ');
             sb.append(Math.round(
                     100 * up.getBytesRead() / (double) up.getUploadSize()));
-            sb.append("%");
+            sb.append('%');
         } else {
             sb.append("Idle");
         }
diff --git a/uitest/src/main/java/com/vaadin/tests/TestForUpload.java b/uitest/src/main/java/com/vaadin/tests/TestForUpload.java
index 24e4683f5e..5d858aadd6 100644
--- a/uitest/src/main/java/com/vaadin/tests/TestForUpload.java
+++ b/uitest/src/main/java/com/vaadin/tests/TestForUpload.java
@@ -278,12 +278,12 @@ public class TestForUpload extends CustomComponent
         if (up.isUploading()) {
             sb.append("Uploading...");
             sb.append(up.getBytesRead());
-            sb.append("/");
+            sb.append('/');
             sb.append(up.getUploadSize());
-            sb.append(" ");
+            sb.append(' ');
             sb.append(Math.round(
                     100 * up.getBytesRead() / (double) up.getUploadSize()));
-            sb.append("%");
+            sb.append('%');
         } else {
             sb.append("Idle");
         }
diff --git a/uitest/src/main/java/com/vaadin/tests/TestSizeableIncomponents.java b/uitest/src/main/java/com/vaadin/tests/TestSizeableIncomponents.java
index 40e7f82014..68856973fd 100644
--- a/uitest/src/main/java/com/vaadin/tests/TestSizeableIncomponents.java
+++ b/uitest/src/main/java/com/vaadin/tests/TestSizeableIncomponents.java
@@ -246,15 +246,15 @@ public class TestSizeableIncomponents extends LegacyApplication {
         public String getTestableName() {
             StringBuffer sb = new StringBuffer();
             sb.append(classToTest.getName().replaceAll("com.vaadin.ui.", ""));
-            sb.append("[");
+            sb.append('[');
             for (Iterator<Configuration> i = configurations.iterator(); i
                     .hasNext();) {
                 sb.append((i.next()).getDescription());
                 if (i.hasNext()) {
-                    sb.append(",");
+                    sb.append(',');
                 }
             }
-            sb.append("]");
+            sb.append(']');
 
             return sb.toString();
         }
diff --git a/uitest/src/main/java/com/vaadin/tests/components/grid/GridDragAndDrop.java b/uitest/src/main/java/com/vaadin/tests/components/grid/GridDragAndDrop.java
index a71952d53e..d0bd23110e 100644
--- a/uitest/src/main/java/com/vaadin/tests/components/grid/GridDragAndDrop.java
+++ b/uitest/src/main/java/com/vaadin/tests/components/grid/GridDragAndDrop.java
@@ -132,13 +132,13 @@ public class GridDragAndDrop extends AbstractTestUIWithLog {
         // Set data generator
         dragSource.setDragDataGenerator("application/json", person -> {
             StringBuilder builder = new StringBuilder();
-            builder.append("{");
+            builder.append('{');
             builder.append("\"First Name\":");
             builder.append("\"" + person.getFirstName() + "\"");
-            builder.append(",");
+            builder.append(',');
             builder.append("\"Last Name\":");
             builder.append("\"" + person.getLastName() + "\"");
-            builder.append("}");
+            builder.append('}');
             return builder.toString();
         });
 
diff --git a/uitest/src/main/java/com/vaadin/tests/components/table/HiddenColumnsExpandRatios.java b/uitest/src/main/java/com/vaadin/tests/components/table/HiddenColumnsExpandRatios.java
index 936289223d..af091b9036 100644
--- a/uitest/src/main/java/com/vaadin/tests/components/table/HiddenColumnsExpandRatios.java
+++ b/uitest/src/main/java/com/vaadin/tests/components/table/HiddenColumnsExpandRatios.java
@@ -57,7 +57,7 @@ public class HiddenColumnsExpandRatios extends TestBase {
         String[] strings = { "foo", "bar", "baz" };
         for (int i = 0; i < 5; i++) {
             str.append(strings[Math.abs(rnd.nextInt() % strings.length)])
-                    .append(" ");
+                    .append(' ');
         }
         return str.toString();
     }
diff --git a/uitest/src/main/java/com/vaadin/tests/components/window/WindowCloseShortcuts.java b/uitest/src/main/java/com/vaadin/tests/components/window/WindowCloseShortcuts.java
index b7995e7b8a..8eba127abd 100644
--- a/uitest/src/main/java/com/vaadin/tests/components/window/WindowCloseShortcuts.java
+++ b/uitest/src/main/java/com/vaadin/tests/components/window/WindowCloseShortcuts.java
@@ -173,10 +173,10 @@ public class WindowCloseShortcuts extends AbstractTestUI {
 
         sb.append("<" + producedElem.tagName() + "");
         for (String attrName : names) {
-            sb.append(" ").append(attrName).append("=").append("\'")
+            sb.append(' ').append(attrName).append('=').append("\'")
                     .append(producedElem.attr(attrName)).append("\'");
         }
-        sb.append(">");
+        sb.append('>');
         for (Node child : producedElem.childNodes()) {
             if (child instanceof Element) {
                 elementToHtml((Element) child, sb);
@@ -185,7 +185,7 @@ public class WindowCloseShortcuts extends AbstractTestUI {
                 sb.append(text.trim());
             }
         }
-        sb.append("</").append(producedElem.tagName()).append(">");
+        sb.append("</").append(producedElem.tagName()).append('>');
         return sb.toString();
     }