isEmoji(int codePoint)
    isEmojiComponent(int codePoint)
    isEmojiModifier(int codePoint)
    isEmojiModifierBase(int codePoint)
    isEmojiPresentation(int codePoint)
    isExtendedPictographic(int codePoint)

public static void main(String[] args) {
    StringBuilder sb = new StringBuilder();
    sb.appendCodePoint(0x1F600); // Grinning face
    sb.appendCodePoint(0x1F601); // Grinning face with big eyes
    sb.appendCodePoint(0x1F602); // Grinning face with tears
    sb.appendCodePoint(0x1F923); // Rolling on the floor laughing
    sb.appendCodePoint(0x1F970); // Smiling face with hearts
    sb.appendCodePoint(0x1F60D); // Smiling face with heart-eyes
    sb.appendCodePoint(0x1F929); // Star-struck
    sb.appendCodePoint(0x1F618); // Face blowing a kiss
    sb.appendCodePoint(0x1F617); // Kissing face
    sb.appendCodePoint(0x263A); // Smiling face
    System.out.println(sb);

    var codePoint = Character.codePointAt("😃", 0);
    var isEmoji = Character.isEmoji(codePoint);
    System.out.println("😃 is an emoji: " + isEmoji);

    int[] surrogates = { 0xD83D, 0xDC7D };
    String alienEmojiString = new String(surrogates, 0, surrogates.length);
    System.out.println(alienEmojiString);
}