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src/java.desktop/share/classes/javax/sound/sampled/spi/MixerProvider.java

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@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, 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

@@ -38,10 +38,15 @@
  * @since 1.3
  */
 public abstract class MixerProvider {
 
     /**
+     * Constructs a {@code MixerProvider}.
+     */
+    protected MixerProvider() {}
+
+    /**
      * Indicates whether the mixer provider supports the mixer represented by
      * the specified mixer info object.
      * <p>
      * The full set of mixer info objects that represent the mixers supported by
      * this {@code MixerProvider} may be obtained through the
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