JDK 11 jdk.javadoc.jmod is the JMOD file for JDK 11 Java Document tool, which can be invoked by the "javadoc" command.

JDK 11 Java Document tool compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.javadoc.jmod.

JDK 11 Java Document tool compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.

JDK 11 Java Document tool source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.javadoc.

You can click and view the content of each source code file in the list below.

⏎ com/sun/javadoc/SerialFieldTag.java

/*
 * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package com.sun.javadoc;

/**
 * Documents a Serializable field defined by an ObjectStreamField.
 * <pre>
 * The class parses and stores the three serialField tag parameters:
 *
 * - field name
 * - field type name
 *      (fully-qualified or visible from the current import context)
 * - description of the valid values for the field

 * </pre>
 * This tag is only allowed in the javadoc for the special member
 * serialPersistentFields.
 *
 * @author Joe Fialli
 *
 * @see java.io.ObjectStreamField
 *
 * @deprecated
 *   The declarations in this package have been superseded by those
 *   in the package {@code jdk.javadoc.doclet}.
 *   For more information, see the <i>Migration Guide</i> in the documentation for that package.
 */
@Deprecated(since="9", forRemoval=true)
@SuppressWarnings("removal")
public interface SerialFieldTag extends Tag, Comparable<Object> {

    /**
     * Return the serializable field name.
     *
     * @return the serializable field name.
     */
    public String fieldName();

    /**
     * Return the field type string.
     *
     * @return the field type string.
     */
    public String fieldType();

    /**
     * Return the ClassDoc for field type.
     *
     * @return null if no ClassDoc for field type is visible from
     *         containingClass context.
     */
    public ClassDoc fieldTypeDoc();

    /**
     * Return the field comment. If there is no serialField comment, return
     * javadoc comment of corresponding FieldDoc.
     *
     * @return the field comment. If there is no serialField comment, return
     *         javadoc comment of corresponding FieldDoc.
     */
    public String description();

    /**
     * Compares this Object with the specified Object for order.  Returns a
     * negative integer, zero, or a positive integer as this Object is less
     * than, equal to, or greater than the given Object.
     * <p>
     * Included to make SerialFieldTag items java.lang.Comparable.
     *
     * @param   obj the {@code Object} to be compared.
     * @return  a negative integer, zero, or a positive integer as this Object
     *          is less than, equal to, or greater than the given Object.
     * @exception ClassCastException the specified Object's type prevents it
     *            from being compared to this Object.
     * @since 1.2
     */
    public int compareTo(Object obj);
}

⏎ com/sun/javadoc/SerialFieldTag.java

Or download all of them as a single archive file:

File name: jdk.javadoc-11.0.1-src.zip
File size: 680806 bytes
Release date: 2018-11-04
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