java过滤emoji

public class EmojiFilter {
	public static String filterEmoji(String source) {
		StringBuilder sb = new StringBuilder(source);
		for (int len = source.length(), i = len - 1; i >= 0; --i) {
			int codePoint = source.codePointAt(i);
			// Emoji表情所在码位为U+1F300 – U+1F64F
			if (codePoint >= 127744) {
				sb.deleteCharAt(i);
			}
		}
		return sb.toString();
	}
}