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## src/java.base/share/classes/java/security/SignedObject.java

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    @@ -1,7 +1,7 @@
      /*
    -  * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
    +  * Copyright (c) 1997, 2021, 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

    @@ -116,21 +116,27 @@
       * @since 1.2
       */

      public final class SignedObject implements Serializable {

    -     @java.io.Serial
    +     @Serial
          private static final long serialVersionUID = 720502720485447167L;

    -     /*
    +     /**
           * The original content is "deep copied" in its serialized format
    -      * and stored in a byte array.  The signature field is also in the
    -      * form of byte array.
    +      * and stored in a byte array.
           */
    -
          private byte[] content;
    +
    +     /**
    +      * The signature field is stored as a byte array.
    +      */
          private byte[] signature;
    +
    +     /**
    +      * The algorithm used to sign the object.
    +      */
          private String thealgorithm;

          /**
           * Constructs a SignedObject from any Serializable object.
           * The given object is signed with the given signing key, using the

    @@ -248,15 +254,19 @@
          }

          /**
           * readObject is called to restore the state of the SignedObject from
           * a stream.
    +      *
    +      * @param  s the {@code ObjectInputStream} from which data is read
    +      * @throws IOException if an I/O error occurs
    +      * @throws ClassNotFoundException if a serialized class cannot be loaded
           */
    -     @java.io.Serial
    -     private void readObject(java.io.ObjectInputStream s)
    -         throws java.io.IOException, ClassNotFoundException {
    -             java.io.ObjectInputStream.GetField fields = s.readFields();
    +     @Serial
    +     private void readObject(ObjectInputStream s)
    +         throws IOException, ClassNotFoundException {
    +             ObjectInputStream.GetField fields = s.readFields();
                  content = ((byte[])fields.get("content", null)).clone();
                  signature = ((byte[])fields.get("signature", null)).clone();
                  thealgorithm = (String)fields.get("thealgorithm", null);
          }
      }

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