Java Swing - 如何extends DefaultMetalTheme

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import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRootPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.plaf.ColorUIResource;
import javax.swing.plaf.metal.DefaultMetalTheme;
import javax.swing.plaf.metal.MetalLookAndFeel;
public class Main {
  public static void main_helper(String args[]) {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    f.setSize(300, 300);
    f.setUndecorated(true);
    f.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
    JPanel panel = new JPanel();
    panel.setBackground(java.awt.Color.white);
    f.setContentPane(panel);
    MetalLookAndFeel.setCurrentTheme(new MyDefaultMetalTheme());
    try {
      UIManager.setLookAndFeel(new MetalLookAndFeel());
    } catch (Exception e) {
      e.printStackTrace();
    }
    SwingUtilities.updateComponentTreeUI(f);
    f.setVisible(true);
 
 
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