--- old/src/java.base/share/classes/java/security/PermissionCollection.java	2014-08-27 09:58:36.000000000 +0800
+++ new/src/java.base/share/classes/java/security/PermissionCollection.java	2014-08-27 09:58:35.000000000 +0800
@@ -179,13 +179,13 @@
     public String toString() {
         Enumeration<Permission> enum_ = elements();
         StringBuilder sb = new StringBuilder();
-        sb.append(super.toString()+" (\n");
+        sb.append(super.toString()).append(" (\n");
         while (enum_.hasMoreElements()) {
             try {
-                sb.append(" ");
+                sb.append(' ');
                 sb.append(enum_.nextElement().toString());
-                sb.append("\n");
-            } catch (NoSuchElementException e){
+                sb.append('\n');
+            } catch (NoSuchElementException e) {
                 // ignore
             }
         }