private String fetchPath(){
        StringBuffer sb = new StringBuffer();
        boolean first = true;
        for(String path : paths){
            if(!first){
                sb.append(".");
            }
            sb.append(path);
            first = false;
        }
        return sb.toString();
    }
private String fetchPath(){
        StringBuffer sb = new StringBuffer();
        boolean first = true;
        for(String path : paths){
            if(!first){
                sb.append(".");
            }
            sb.append(path);
            first = false;
        }
        return sb.toString();
    }
private String fetchPath ( ) { StringBuffer sb = new StringBuffer ( ) ; boolean first = true ; for ( String path : paths ) { if ( ! first ) { sb . append ( "." ) ; } sb . append ( path ) ; first = false ; } return sb . toString ( ) ; }
提取路径
@return
提取路径