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JDK 1.6
  java.util.prefs. PreferencesFactory View Javadoc
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/*
 * @(#)PreferencesFactory.java	1.6 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package java.util.prefs;
import java.util.*;

/**
 * A factory object that generates Preferences objects.  Providers of
 * new {@link Preferences} implementations should provide corresponding
 * <tt>PreferencesFactory</tt> implementations so that the new
 * <tt>Preferences</tt> implementation can be installed in place of the 
 * platform-specific default implementation.
 *
 * <p><strong>This class is for <tt>Preferences</tt> implementers only.
 * Normal users of the <tt>Preferences</tt> facility should have no need to
 * consult this documentation.</strong>
 *
 * @author  Josh Bloch
 * @version 1.6, 11/17/05
 * @see     Preferences
 * @since   1.4
 */
public interface PreferencesFactory {
    /**
     * Returns the system root preference node.  (Multiple calls on this
     * method will return the same object reference.)
     */
    Preferences systemRoot();

    /**
     * Returns the user root preference node corresponding to the calling
     * user.  In a server, the returned value will typically depend on
     * some implicit client-context.
     */
    Preferences userRoot();
}

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