private static String list(String[] arr,int from,int len){
  StringBuffer sb=new StringBuffer();
  for (int i=from; i < len; i++) {
    sb.append(arr[i]);
    if (i + 1 != arr.length)     sb.append('/');
  }
  return sb.toString();
}

private static String list ( String [ ] arr , int from , int len ) { StringBuffer sb = new StringBuffer ( ) ; for ( int i = from ; i < len ; i ++ ) { sb . append ( arr [ i ] ) ; if ( i + 1 != arr . length ) sb . append ( '/' ) ; } return sb . toString ( ) ; }
convert a string array to a string list , but only part of it
