JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1996, 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
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package java.rmi;

import java.security.*;

/**
 * {@code RMISecurityManager} implements a policy identical to the policy
 * implemented by {@link SecurityManager}. RMI applications
 * should use the {@code SecurityManager} class or another appropriate
 * {@code SecurityManager} implementation instead of this class. RMI's class
 * loader will download classes from remote locations only if a security
 * manager has been set.
 *
 * @implNote
 * <p>Applets typically run in a container that already has a security
 * manager, so there is generally no need for applets to set a security
 * manager. If you have a standalone application, you might need to set a
 * {@code SecurityManager} in order to enable class downloading. This can be
 * done by adding the following to your code. (It needs to be executed before
 * RMI can download code from remote hosts, so it most likely needs to appear
 * in the {@code main} method of your application.)
 *
 * <pre>{@code
 *    if (System.getSecurityManager() == null) {
 *        System.setSecurityManager(new SecurityManager());
 *    }
 * }</pre>
 *
 * @author  Roger Riggs
 * @author  Peter Jones
 * @since JDK1.1

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