Java Swing - 如何在JFrame的TI栏显示日语字符

import javax.swing.JFrame;
import javax.swing.JLabel;

public class Main {
  public static void main(String[] argv) throws Exception {
    final String title = "Testing: \u30CD";

    JFrame frame = new JFrame(title);
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    JLabel label = new JLabel(title);
    label.setSize(200, 100);
    frame.setContentPane(label);
    frame.pack();
    frame.setVisible(true);

  }
}