https://openjdk.java.net/ 
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 * accompanied this code).
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Provides user interface objects built according to the Java look and feel
(once codenamed Metal), which is the default look and feel.

 These classes are designed to be used while the corresponding LookAndFeel class has been installed (UIManager.setLookAndFeel(new XXXLookAndFeel())). Using them while a different LookAndFeel is installed may produce unexpected results, including exceptions. Additionally, changing the LookAndFeel maintained by the UIManager without updating the corresponding ComponentUI of any JComponents may also produce unexpected results, such as the wrong colors showing up, and is generally not encouraged. 

Note:
Most of the Swing API is not thread safe. For details, see
Concurrency in Swing,
a section in
The Java Tutorial.

Since:1.2
@serialexclude
/**
 * 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
 * href="https://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html"
 * target="_top">Concurrency in Swing</a>,
 * a section in
 * <em><a href="https://docs.oracle.com/javase/tutorial/"
 * target="_top">The Java Tutorial</a></em>.
 *
 * @since 1.2
 * @serial exclude
 */
package javax.swing.plaf.metal;