screen.java

This is a resource based on j2me embedded,if you dont understand,you can connection with me .

/*
 *   
 *
 * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 only, as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License version 2 for more details (a copy is
 * included at /legal/license.txt).
 * 
 * You should have received a copy of the GNU General Public License
 * version 2 along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 * 
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions.
 */

package javax.microedition.lcdui;

/**
 * The common superclass of all high-level user interface classes. The 
 * contents displayed and their interaction with the user are defined by 
 * subclasses.
 *
 * <P>Using subclass-defined methods, the application may change the contents
 * of a <code>Screen</code> object while it is shown to the user.  If
 * this occurs, and the
 * <code>Screen</code> object is visible, the display will be updated
 * automatically.  That
 * is, the implementation will refresh the display in a timely fashion without
 * waiting for any further action by the application.  For example, suppose a
 * <code>List</code> object is currently displayed, and every element
 * of the <code>List</code> is
 * visible.  If the application inserts a new element at the beginning of the
 * <code>List</code>, it is displayed immediately, and the other
 * elements will be
 * rearranged appropriately.  There is no need for the application to call
 * another method to refresh the display.</P>
 *
 * <P>It is recommended that applications change the contents of a
 * <code>Screen</code> only
 * while it is not visible (that is, while another
 * <code>Displayable</code> is current).
 * Changing the contents of a <code>Screen</code> while it is visible
 * may result in
 * performance problems on some devices, and it may also be confusing if the
 * <code>Screen's</code> contents changes while the user is
 * interacting with it.</P>
 *
 * <P>In MIDP the four <code>Screen</code> methods that defined
 * read/write ticker and
 * title properties were moved to <code>Displayable</code>,
 * <code>Screen's</code> superclass.  The
 * semantics of these methods have not changed.</P>
 * 
 * @since MIDP 1.0
 */
public abstract class Screen extends Displayable  {

    /**
     * Creates a new Screen object with the given title and with no ticker.
     *
     * @param title the Screen's title, or null for no title
     */
    Screen(String title) {
        super(title);
    }
}