JDK 11 java.desktop.jmod is the JMOD file for JDK 11 Desktop module.

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

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

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

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

⏎ com/sun/java/swing/plaf/windows/WindowsPopupWindow.java

/*
 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package com.sun.java.swing.plaf.windows;

import javax.swing.JWindow;
import java.awt.Window;
import java.awt.Graphics;

/**
 * A class which tags a window with a particular semantic usage,
 * either tooltip, menu, sub-menu, popup-menu, or comobobox-popup.
 * This is used as a temporary solution for getting native AWT support
 * for transition effects in Windows 98 and Windows 2000.  The native
 * code will interpret the windowType property and automatically
 * implement appropriate animation when the window is shown/hidden.
 * <p>
 * Note that support for transition effects may be supported with a
 * different mechanism in the future and so this class is
 * package-private and targeted for Swing implementation use only.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases.  The current serialization support is appropriate
 * for short term storage or RMI between applications running the same
 * version of Swing.  A future release of Swing will provide support for
 * long term persistence.
 *
 * @author Amy Fowler
 */
@SuppressWarnings("serial") // Superclass is not serializable across versions
class WindowsPopupWindow extends JWindow {

    static final int UNDEFINED_WINDOW_TYPE      = 0;
    static final int TOOLTIP_WINDOW_TYPE        = 1;
    static final int MENU_WINDOW_TYPE           = 2;
    static final int SUBMENU_WINDOW_TYPE        = 3;
    static final int POPUPMENU_WINDOW_TYPE      = 4;
    static final int COMBOBOX_POPUP_WINDOW_TYPE = 5;

    private int windowType;

    WindowsPopupWindow(Window parent) {
        super(parent);
        setFocusableWindowState(false);
    }

    void setWindowType(int type) {
        windowType = type;
    }

    int getWindowType() {
        return windowType;
    }

    public void update(Graphics g) {
        paint(g);
    }

    @SuppressWarnings("deprecation")
    public void hide() {
        super.hide();
        /** We need to call removeNotify() here because hide() does
         * something only if Component.visible is true. When the app
         * frame is miniaturized, the parent frame of this frame is
         * invisible, causing AWT to believe that this frame
         *  is invisible and causing hide() to do nothing
         */
        removeNotify();
    }

    @SuppressWarnings("deprecation")
    public void show() {
        super.show();
        this.pack();
    }
}

⏎ com/sun/java/swing/plaf/windows/WindowsPopupWindow.java

Or download all of them as a single archive file:

File name: java.desktop-11.0.1-src.zip
File size: 7974380 bytes
Release date: 2018-11-04
Download 

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