JDK 11 java.prefs.jmod is the JMOD file for JDK 11 Prefs module.

JDK 11 Prefs module compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\java.prefs.jmod.

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

JDK 11 Prefs module source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\java.prefs.

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

⏎ java/util/prefs/PreferenceChangeListener.java

/*
 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package java.util.prefs;

/**
 * A listener for receiving preference change events.
 *
 * @author  Josh Bloch
 * @see Preferences
 * @see PreferenceChangeEvent
 * @see NodeChangeListener
 * @since   1.4
 */
@FunctionalInterface
public interface PreferenceChangeListener extends java.util.EventListener {
    /**
     * This method gets called when a preference is added, removed or when
     * its value is changed.
     *
     * @param evt A PreferenceChangeEvent object describing the event source
     *          and the preference that has changed.
     */
    void preferenceChange(PreferenceChangeEvent evt);
}

⏎ java/util/prefs/PreferenceChangeListener.java

Or download all of them as a single archive file:

File name: java.prefs-11.0.1-src.zip
File size: 45946 bytes
Release date: 2018-11-04
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