src/jdk.compiler/share/classes/com/sun/tools/javac/util/Bits.java

@@ -1,7 +1,7 @@
  /*
-  * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
+  * Copyright (c) 1999, 2025, 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

@@ -86,11 +86,14 @@
  
      private static final int wordlen = 32;
      private static final int wordshift = 5;
      private static final int wordmask = wordlen - 1;
  
-     public int[] bits = null;
+     /* every int in the bits array is used to represent 32 bits, so the bits array will have
+      * length == 1 until we need to represent the 33rd bit and so on.
+      */
+     private int[] bits = null;
      // This field will store last version of bits after every change.
      private static final int[] unassignedBits = new int[0];
  
      protected BitsState currentState;