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.

⏎ jdk/javadoc/internal/api/JavadocTool.java

/*
 * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package jdk.javadoc.internal.api;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Writer;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Locale;
import java.util.Objects;
import java.util.Set;

import javax.lang.model.SourceVersion;
import javax.tools.DiagnosticListener;
import javax.tools.DocumentationTool;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;

import com.sun.tools.javac.api.ClientCodeWrapper;
import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.file.BaseFileManager;
import com.sun.tools.javac.util.ClientCodeException;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Log;
import jdk.javadoc.internal.tool.ToolOption;

/**
 * Provides access to functionality specific to the JDK documentation tool,
 * javadoc.
 *
 * <p><b>This is NOT part of any supported API.
 * If you write code that depends on this, you do so at your own
 * risk.  This code and its internal interfaces are subject to change
 * or deletion without notice.</b></p>
 */
public class JavadocTool implements DocumentationTool {
    // @Override // can't add @Override until bootstrap JDK provides Tool.name()
    public String name() {
        return "javadoc";
    }

    @Override
    public DocumentationTask getTask(
            Writer out,
            JavaFileManager fileManager,
            DiagnosticListener<? super JavaFileObject> diagnosticListener,
            Class<?> docletClass,
            Iterable<String> options,
            Iterable<? extends JavaFileObject> compilationUnits) {
        Context context = new Context();
        return getTask(out, fileManager, diagnosticListener,
                docletClass, options, compilationUnits, context);
    }

    public DocumentationTask getTask(
            Writer out,
            JavaFileManager fileManager,
            DiagnosticListener<? super JavaFileObject> diagnosticListener,
            Class<?> docletClass,
            Iterable<String> options,
            Iterable<? extends JavaFileObject> compilationUnits,
            Context context) {
        try {
            ClientCodeWrapper ccw = ClientCodeWrapper.instance(context);

            if (options != null) {
                for (String option : options)
                    Objects.requireNonNull(option);
            }

            if (compilationUnits != null) {
                compilationUnits = ccw.wrapJavaFileObjects(compilationUnits); // implicit null check
                for (JavaFileObject cu : compilationUnits) {
                    if (cu.getKind() != JavaFileObject.Kind.SOURCE) {
                        final String kindMsg = "All compilation units must be of SOURCE kind";
                        throw new IllegalArgumentException(kindMsg);
                    }
                }
            }

            if (diagnosticListener != null)
                context.put(DiagnosticListener.class, ccw.wrap(diagnosticListener));

            if (out == null)
                context.put(Log.errKey, new PrintWriter(System.err, true));
            else if (out instanceof PrintWriter)
                context.put(Log.errKey, ((PrintWriter) out));
            else
                context.put(Log.errKey, new PrintWriter(out, true));

            if (fileManager == null) {
                fileManager = getStandardFileManager(diagnosticListener, null, null);
                if (fileManager instanceof BaseFileManager) {
                    ((BaseFileManager) fileManager).autoClose = true;
                }
            }
            fileManager = ccw.wrap(fileManager);
            context.put(JavaFileManager.class, fileManager);

            return new JavadocTaskImpl(context, docletClass, options, compilationUnits);
        } catch (ClientCodeException ex) {
            throw new RuntimeException(ex.getCause());
        }
    }

    // TODO: used shared static method in JavacFileManager
    @Override
    public StandardJavaFileManager getStandardFileManager(
            DiagnosticListener<? super JavaFileObject> diagnosticListener,
            Locale locale,
            Charset charset) {
        Context context = new Context();
        context.put(Locale.class, locale);
        if (diagnosticListener != null)
            context.put(DiagnosticListener.class, diagnosticListener);
        PrintWriter pw = (charset == null)
                ? new PrintWriter(System.err, true)
                : new PrintWriter(new OutputStreamWriter(System.err, charset), true);
        context.put(Log.errKey, pw);
        return new JavacFileManager(context, true, charset);
    }

    @Override
    public int run(InputStream in, OutputStream out, OutputStream err, String... arguments) {
        PrintWriter err_pw = new PrintWriter(err == null ? System.err : err, true);
        PrintWriter out_pw = new PrintWriter(out == null ? System.out : out);
        try {
            return jdk.javadoc.internal.tool.Main.execute(arguments, err_pw);
        } finally {
            err_pw.flush();
            out_pw.flush();
        }
    }

    @Override
    public Set<SourceVersion> getSourceVersions() {
        return Collections.unmodifiableSet(
                EnumSet.range(SourceVersion.RELEASE_3, SourceVersion.latest()));
    }

    @Override
    public int isSupportedOption(String option) {
        if (option == null)
            throw new NullPointerException();
        for (ToolOption o : ToolOption.values()) {
            for (String name : o.names) {
                if (name.equals(option))
                    return o.hasArg ? 1 : 0;
            }
        }
        return -1;
    }

}

⏎ jdk/javadoc/internal/api/JavadocTool.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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