src/java.base/share/classes/java/lang/Class.java

rev 49518 : [mq]: 8200696-Optimal-initial-capacity-of-java-lang-Class-enumConstantDirectory

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1994, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1994, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -3527,11 +3527,11 @@
         if (directory == null) {
             T[] universe = getEnumConstantsShared();
             if (universe == null)
                 throw new IllegalArgumentException(
                     getName() + " is not an enum type");
-            directory = new HashMap<>(2 * universe.length);
+            directory = new HashMap<>((int)(universe.length / 0.75f + 1.0f));
             for (T constant : universe) {
                 directory.put(((Enum<?>)constant).name(), constant);
             }
             enumConstantDirectory = directory;
         }