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/MethodDoc.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;

/**
 * Represents a method of a java class.
 *
 * @since 1.2
 * @author Robert Field
 *
 * @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 *   The declarations in this package have been superseded by those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 MethodDoc extends ExecutableMemberDoc {

    /**
     * Return true if this method is abstract
     *
     * @return true if this method is abstract
     */
    boolean isAbstract();

    /**
     * Return true if this method is default
     *
     * @return true if this method is default
     */
    boolean isDefault();

    /**
     * Get return type.
     *
     * @return the return type of this method, null if it
     * is a constructor.
     */
    Type returnType();

    /**
     * Return the class containing the method that this method overrides.
     *
     * <p> <i>The {@code overriddenClass} method cannot
     * accommodate certain generic type constructs.  The
     * {@code overriddenType} method should be used instead.</i>
     *
     * @return a ClassDoc representing the superclass
     *         defining a method that this method overrides, or null if
     *         this method does not override.
     */
    ClassDoc overriddenClass();

    /**
     * Return the type containing the method that this method overrides.
     * It may be a {@code ClassDoc} or a {@code ParameterizedType}.
     *
     * @return the supertype whose method is overridden, or null if this
     *         method does not override another in a superclass
     * @since 1.5
     */
    Type overriddenType();

    /**
     * Return the method that this method overrides.
     *
     * @return a MethodDoc representing a method definition
     * in a superclass this method overrides, null if
     * this method does not override.
     */
    MethodDoc overriddenMethod();

    /**
     * Tests whether this method overrides another.
     * The overridden method may be one declared in a superclass or
     * a superinterface (unlike {@link #overriddenMethod()}).
     *
     * <p> When a non-abstract method overrides an abstract one, it is
     * also said to <i>implement</i> the other.
     *
     * @param meth  the other method to examine
     * @return {@code true} if this method overrides the other
     * @since 1.5
     */
    boolean overrides(MethodDoc meth);
}

⏎ com/sun/javadoc/MethodDoc.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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