public class test3 {

    public static void main(String[] args) {
        String card_no="sh15178585855sh";
        String vip_phone="15178585855";
        if (card_no != null && !card_no.equals("")) {
            if (card_no.contains(vip_phone)) {
                int a = card_no.indexOf(vip_phone);             
                    String
 
 subPhone = card_no.substring(a, a + vip_phone.length());
                    if (subPhone.length() == 11) {
                        String start = vip_phone.substring(0, 3);
                        String end = vip_phone.substring(7);
                        String finalPhone = start + "****" + end;
                        String
 
 sub_card_no = card_no.substring(0, a) + finalPhone
                                + card_no.substring(a + vip_phone.length(), card_no.length());
                         System.out.println(sub_card_no);

                }
            }
        }

    }

}