JDK 11 jdk.jlink.jmod is the JMOD file for JDK 11 JLink tool, which can be invoked by the "jlink" command.

JDK 11 JLink tool compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.jlink.jmod.

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

JDK 11 JLink tool source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.jlink.

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

⏎ jdk/tools/jlink/plugin/ResourcePoolModule.java

/*
 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package jdk.tools.jlink.plugin;

import java.lang.module.ModuleDescriptor;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Stream;
import jdk.internal.module.ModuleTarget;

/**
  * Link-time representation of a module.
  */
public interface ResourcePoolModule {
    /**
     * The module name.
     *
     * @return The module name.
     */
    public String name();

    /**
     * Retrieves a ResourcePoolEntry from the given path (e.g:
     * /mymodule/com.foo.bar/MyClass.class)
     *
     * @param path The piece of data path.
     * @return A ResourcePoolEntry of the given path, if found.
     */
    public Optional<ResourcePoolEntry> findEntry(String path);

    /**
     * The module descriptor of this module.
     *
     * @return The module descriptor.
     */
    public ModuleDescriptor descriptor();

    /**
     * The target platform
     *
     * @return The target platform
     */
    public String targetPlatform();

    /**
     * Retrieves all the packages located in this module.
     *
     * @return The set of packages.
     */
    public Set<String> packages();

    /**
     * Retrieves the stream of ResourcePoolEntry.
     *
     * @return The ResourcePoolEntry stream.
     */
    public Stream<ResourcePoolEntry> entries();

    /**
     * Return the number of ResourcePoolEntry count in this ResourcePoolModule.
     *
     * @return the entry count.
     */
    public int entryCount();
}

⏎ jdk/tools/jlink/plugin/ResourcePoolModule.java

Or download all of them as a single archive file:

File name: jdk.jlink-11.0.1-src.zip
File size: 155677 bytes
Release date: 2018-11-04
Download 

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