--- old/src/java.desktop/share/classes/javax/swing/event/TreeModelEvent.java	2014-08-21 20:51:09.000000000 +0800
+++ new/src/java.desktop/share/classes/javax/swing/event/TreeModelEvent.java	2014-08-21 20:51:08.000000000 +0800
@@ -294,21 +294,20 @@
     public String toString() {
         StringBuilder   sb = new StringBuilder();
 
-        sb.append(getClass().getName() + " " +
-                  Integer.toString(hashCode()));
+        sb.append(getClass().getName()).append(' ').append(Integer.toString(hashCode()));
         if(path != null)
-            sb.append(" path " + path);
+            sb.append(" path ").append(path);
         if(childIndices != null) {
             sb.append(" indices [ ");
             for(int counter = 0; counter < childIndices.length; counter++)
-                sb.append(Integer.toString(childIndices[counter])+ " ");
-            sb.append("]");
+                sb.append(Integer.toString(childIndices[counter])).append(' ');
+            sb.append(']');
         }
         if(children != null) {
             sb.append(" children [ ");
             for(int counter = 0; counter < children.length; counter++)
-                sb.append(children[counter] + " ");
-            sb.append("]");
+                sb.append(children[counter]).append(' ');
+            sb.append(']');
         }
         return sb.toString();
     }