--- old/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicTreeUI.java	2014-08-26 11:17:52.000000000 +0800
+++ new/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicTreeUI.java	2014-08-26 11:17:51.000000000 +0800
@@ -3618,8 +3618,8 @@
                     boolean leaf = model.isLeaf(node);
                     String label = getDisplayString(path, true, leaf);
 
-                    plainStr.append(label + "\n");
-                    htmlStr.append("  <li>" + label + "\n");
+                    plainStr.append(label).append('\n');
+                    htmlStr.append("  <li>").append(label).append('\n');
                 }
 
                 // remove the last newline