JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 in the LICENSE file that
 * accompanied this code).
 *
 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package java.applet;

import java.net.URL;

/**
 * When an applet is first created, an applet stub is attached to it
 * using the applet's <code>setStub</code> method. This stub
 * serves as the interface between the applet and the browser
 * environment or applet viewer environment in which the application
 * is running.
 *
 * @author      Arthur van Hoff
 * @see         java.applet.Applet#setStub(java.applet.AppletStub)
 * @since       JDK1.0
 */
public interface AppletStub {
    /**
     * Determines if the applet is active. An applet is active just
     * before its <code>start</code> method is called. It becomes
     * inactive just before its <code>stop</code> method is called.
     *
     * @return  <code>true</code> if the applet is active;
     *          <code>false</code> otherwise.
     */
    boolean isActive();


    /**
     * Gets the URL of the document in which the applet is embedded.
     * For example, suppose an applet is contained
     * within the document:
     * <blockquote><pre>
     *    http://www.oracle.com/technetwork/java/index.html
     * </pre></blockquote>
     * The document base is:
     * <blockquote><pre>
     *    http://www.oracle.com/technetwork/java/index.html
     * </pre></blockquote>
     *
     * @return  the {@link java.net.URL} of the document that contains the
     *          applet.
     * @see     java.applet.AppletStub#getCodeBase()
     */
    URL getDocumentBase();

    /**
     * Gets the base URL. This is the URL of the directory which contains the applet.
     *
     * @return  the base {@link java.net.URL} of
     *          the directory which contains the applet.
     * @see     java.applet.AppletStub#getDocumentBase()
     */
    URL getCodeBase();

    /**
     * Returns the value of the named parameter in the HTML tag. For
     * example, if an applet is specified as
     * <blockquote><pre>
     * &lt;applet code="Clock" width=50 height=50&gt;
     * &lt;param name=Color value="blue"&gt;
     * &lt;/applet&gt;
     * </pre></blockquote>
     * <p>
     * then a call to <code>getParameter("Color")</code> returns the
     * value <code>"blue"</code>.
     *
     * @param   name   a parameter name.
     * @return  the value of the named parameter,
     * or <tt>null</tt> if not set.
     */
    String getParameter(String name);


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