Prefix && Last

private String getLast(String prefix){
    String a=prefix.replaceAll(",","");
    int index=a.indexOf('.');
    int strLength=index-1;
    return a.substring(strLength,index);
}

private String getPrefix(String last){
    String a=last.replaceAll(",","");
    int lastIndex=a.length()-1;
    int strLength=a.length();
    return a.substring(lastIndex,strLength);
}