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Java Swing - 如何使用SoftBevelBorder

border 【border】
我们想知道如何使用SoftBevelBorder。
代码展示 运行结果 
import java.awt.Font;
import java.awt.GridBagLayout;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.BevelBorder;
import javax.swing.border.SoftBevelBorder;

public class Main {
  static final String COMBO_BOX_ELEMENTS[] = { "Roll", "SetCode", "Answers",
      "Others" };

  public static void main(String[] args) {
    JFrame window = new JFrame("Example");

    JPanel contentPane = new JPanel();

    contentPane.setLayout(new GridBagLayout());

    JComboBox comboBoxfields = new JComboBox(COMBO_BOX_ELEMENTS);

    comboBoxfields.setFont(new Font("sansserif", Font.TRUETYPE_FONT
        | Font.PLAIN, 15));
    comboBoxfields.setBorder(new SoftBevelBorder(BevelBorder.LOWERED));

    comboBoxfields.setMaximumRowCount(5);

    comboBoxfields.addActionListener(e -> System.out.println("'"
        + comboBoxfields.getSelectedItem().toString() + "'" + " was selected"));

    contentPane.add(comboBoxfields);

    window.add(contentPane);
    window.setSize(500, 500);
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setVisible(true);
  }
}