JDK14/Java14源码在线阅读

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
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 * 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).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * Provides user interface objects that combine two or more look and feels. When
 * a component asks for its UI, this look and feel returns a multiplexing UI
 * that handles all communications with both the default look and feel and one
 * or more auxiliary look and feels. For example, if a user combines an
 * auxiliary audio look and feel with the Motif look and feel, the
 * {@code JButton.getUI} method would return an instance of
 * {@code MultiButtonUI}, which would handle both a {@code MotifButtonUI} and an
 * {@code AudioButtonUI}.
 * <p>
 * For more information, see
 * <a href="doc-files/multi_tsc.html" target="_top">
 *     Using the Multiplexing Look and Feel.</a>
 * <p>
 * <strong>Note:</strong>
 * Most of the Swing API is <em>not</em> thread safe. For details, see
 * <a
 * href="https://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html"

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