Quelle Serial.java Sprache: JAVA

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* 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
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* questions.
*/

package java.io;

import java.lang.annotation.*;

/**
* Indicates that an annotated field or method is part of the {@linkplain
* Serializable serialization mechanism} defined by the
* <a href="{@docRoot}/../specs/serialization/output.html">
* <cite>Java Object Serialization Specification</cite></a>. This
* annotation type is intended to allow compile-time checking of
* serialization-related declarations, analogous to the checking
* enabled by the {@link java.lang.Override} annotation type to
* validate method overriding. {@code Serializable} classes are encouraged to
* use {@code @Serial} annotations to help a compiler catch
* mis-declared serialization-related fields and methods,
* mis-declarations that may otherwise be difficult to detect.
*
* Specifically, annotations of this type should be
* applied to serialization-related methods and fields in classes
* declared to be {@code Serializable}. The five serialization-related
* methods are:
*
* <ul>
* <li>{@code private void writeObject(java.io.ObjectOutputStream stream) throws IOException}
* <li>{@code private void readObject(java.io.ObjectInputStream stream) throws IOException, ClassNotFoundException}
* <li>{@code private void readObjectNoData() throws ObjectStreamException}
* <li>ANY-ACCESS-MODIFIER {@code Object writeReplace() throws ObjectStreamException}
* <li>ANY-ACCESS-MODIFIER {@code Object readResolve() throws ObjectStreamException}
* </ul>
*
* The two serialization-related fields are:
*
* <ul>
* <li>{@code private static final ObjectStreamField[] serialPersistentFields}
* <li>{@code private static final long serialVersionUID}
* </ul>
*
* Compilers are encouraged to validate that a method or field marked with a
* {@code @Serial} annotation is one of the defined serialization-related
* methods or fields declared in a meaningful context and issue a warning
* if that is not the case.
*
* It is a semantic error to apply this annotation to other fields or methods, including:
* <ul>
* <li>fields or methods in a class that is not {@code Serializable}
*
* <li>fields or methods of the proper structural declaration, but in
* a type where they are ineffectual. For example, {@code enum} types
* are defined to have a {@code serialVersionUID} of {@code 0L} so a
* {@code serialVersionUID} field declared in an {@code enum} type is
* ignored. The five serialization-related methods identified above
* are likewise ignored for an {@code enum} type.
*
* <li>in a class that is {@code Externalizable}:
* <ul>
* <li> method declarations of {@code writeObject}, {@code
* readObject}, and {@code readObjectNoData}
*
* <li>a field declaration for {@code serialPersistentFields}
* </ul>
*
* While the {@code Externalizable} interface extends {@code
* Serializable}, the three methods and one field above are
* not used for externalizable classes.
*
* </ul>
*
* Note that serialization mechanism accesses its designated fields
* and methods reflectively and those fields and methods may appear
* otherwise unused in a {@code Serializable} class.
*
* @see Serializable
* @see Externalizable
* @since 14
*/
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.SOURCE)
public @interface Serial {}

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