import javax.swing.JFrame;
import javax.swing.JOptionPane;

public class SupplementaryCharTest2 {
    public static void main(String[] args) {
        int codePoint = 0x00010400;
        char[] ch = Character.toChars(codePoint);

        System.out.format("ch[0] = %X ch[1] %X\n", (int)ch[0], (int)ch[1]);
        System.out.format("%X is High: %b Low: %b%n",
                          (int)ch[0], 
                          Character.isHighSurrogate(ch[0]),
                          Character.isLowSurrogate(ch[0]));
        System.out.format("%X is High: %b Low: %b%n", 
                          (int)ch[1],
                          Character.isHighSurrogate(ch[1]),
                          Character.isLowSurrogate(ch[1]));

        String str = new String(new int[]{codePoint}, 0, 1);
        JOptionPane.showMessageDialog((JFrame)null, 
                                      String.format("U+0010400 : %s%n", str));
    }
}