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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 * This code is free software; you can redistribute it and/or modify it
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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 built according to the Java look and feel
 * (once codenamed <em>Metal</em>), which is the default look and feel.
 * <p>
 * These classes are designed to be used while the corresponding
 * {@code LookAndFeel} class has been installed
 * (<code>UIManager.setLookAndFeel(new <i>XXX</i>LookAndFeel())</code>).
 * Using them while a different {@code LookAndFeel} is installed may produce
 * unexpected results, including exceptions. Additionally, changing the
 * {@code LookAndFeel} maintained by the {@code UIManager} without updating the
 * corresponding {@code ComponentUI} of any {@code JComponent}s may also produce
 * unexpected results, such as the wrong colors showing up, and is generally not
 * encouraged.
 * <p>
 * <strong>Note:</strong>
 * Most of the Swing API is <em>not</em> thread safe. For details, see
 * <a

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