Java replaces the four-byte character ' \xf0\x9f\x98\x84\xf0\x9f ' solution??

/**     * Replace the four-byte character ' \xf0\x9f\x98\x84\xf0\x9f ' solution??     * @author Chenguiyong     * @data August 11, 2015 Morning 10:31:50     * @param content     * @return     */public    static String Removefourchar (String content) {        byte[] conbyte = Content.getbytes ();        for (int i = 0; i < conbyte.length; i++) {            if ([Conbyte[i] & 0xF8) = = 0xF0) {for                (int j = 0; j < 4; j+ +) {                                              conbyte[i+j]=0x30;                                     }                  i + = 3;            }        }        Content = new String (conbyte);        return Content.replaceall ("0000", "" ");    }

Results:

String title = "FF's van der Sar sub???????? Llfldakf;dsk. F???????????? DASLFJDSA;LFKJDSD ' J ' l ' F ' k ' d ' j ' sa ' l ' k ';        System.out.println (Test_common2.removefourchar (title) replaceall ("0000", "" "));        The FF's Van der Sar points Llfldakf;dsk. FDASLFJDSA;LFKJDSD ' J ' l ' F ' k ' d ' j ' sa ' l ' k

Java replaces the four-byte character ' \xf0\x9f\x98\x84\xf0\x9f ' solution??