From f6a9a9ad489be81bb7327096b038cc6b63cfa39a Mon Sep 17 00:00:00 2001
From: Hk-tang <hktang@ualberta.ca>
Date: Mon, 6 Apr 2020 08:38:29 -0600
Subject: Change to using StringBuilder (#11941)

Should use a StringBuilder to accumulate strings in a loop, to avoid the performance cost of repeatedly constructing strings.
---
 server/src/main/java/com/vaadin/ui/declarative/Design.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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 0b78a9cbde..a2c698c6bd 100644
--- a/server/src/main/java/com/vaadin/ui/declarative/Design.java
+++ b/server/src/main/java/com/vaadin/ui/declarative/Design.java
@@ -234,14 +234,14 @@ public class Design implements Serializable {
                 throw new DesignException("Unknown tag: " + tagName);
             }
             String[] classNameParts = parts[1].split("-");
-            String className = "";
+            StringBuilder className = new StringBuilder();
             for (String classNamePart : classNameParts) {
                 // Split will ignore trailing and multiple dashes but that
                 // should be
                 // ok
                 // <vaadin-button--> will be resolved to <vaadin-button>
                 // <vaadin--button> will be resolved to <vaadin-button>
-                className += SharedUtil.capitalize(classNamePart);
+                className.append(SharedUtil.capitalize(classNamePart));
             }
             String qualifiedClassName = packageName + "." + className;
 
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