import javax.swing.JFrame;
import javax.swing.JTextArea;

public class SupplementaryCharTest1_1 {
    public static void main(String[] args) {
        int codePoint = 0x00010400;

        JFrame frame = new JFrame("SupplementChar");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(200, 200);

        JTextArea area = new JTextArea();
        area.append(String.format("Char U+0010400 = %c\n", codePoint));
        area.append(String.format("U+0010400 is %s%n", Character.UnicodeBlock.of(codePoint)));

        frame.getContentPane().add(area);
        frame.setVisible(true);
    }
}