Java - Size converter

/**
 * Get the human-readable size for an amount of bytes
 * @param int     size      : the number of bytes to be converted
 * @param int     precision : number of decimal places to round to;
 *                            optional - defaults to 2
 * @param boolean long_name : whether or not the returned size tag 
 *                            should be unabbreviated (ie "Gigabytes"
 *                            or "GB"); optional - defaults to true
 * @param boolean real_size : whether or not to use the real (base
 *                            1024) or commercial (base 1000) size;
 *                            optional - defaults to true
 * @return String           : the converted size
 */
static public String getSize(int size) {
   return getSize(size,2,true,true);
}
static public String getSize(int size,int precision) {
   return getSize(size,precision,true,true);
}
static public String getSize(int size,int precision,boolean longName) {
   return getSize(size,2,longName,true);
}
static public String getSize(int size,int precision,
                                boolean longName,boolean realSize) {
   int base=realSize?1024:1000;
   int pos=0;
   double decSize=(double)size;
   while (decSize>base) {
      decSize/=base;
      pos++;
   }
   String prefix=getSizePrefix(pos);
   String sizeName=longName?prefix+"bytes":""+prefix.charAt(0)+"B";
   sizeName=sizeName.substring(0,1).toUpperCase()+sizeName.substring(1);
   int num=(int)Math.pow(10,precision);
   return (Math.round(decSize*num)/num)+" "+sizeName;
}
/**
 * @param int pos : the distence along the metric scale relitive to 0
 * @return string : the prefix
 */
static public String getSizePrefix(int pos) {
   switch (pos) {
      case  0: return "";
      case  1: return "kilo";
      case  2: return "mega";
      case  3: return "giga";
      case  4: return "tera";
      case  5: return "peta";
      case  6: return "exa";
      case  7: return "zetta";
      case  8: return "yotta";
      case  9: return "xenna";
      case 10: return "w-";
      case 11: return "vendeka";
      case 12: return "u-";
      default: return "?-";
   }
}