public static String reThreeStr(String ss){

      boolean result= ss.matches(\"^[-+]?(([0-9]+)([.]([0-9]+))?|([.]([0-9]+))?)$\");  
      if(result&&ss!=null&&!\"\".equals(ss)){
        Double sss=Double.valueOf(ss);
      String numStr=new java.text.DecimalFormat(\"0.000\").format(sss);
      Double lsDou=Double.valueOf(numStr);
      ss=String.valueOf(lsDou);
      }
    return ss;
  }

public static BigDecimal reThreeBig(BigDecimal ss){
  String numStr=new java.text.DecimalFormat(\"0.000\").format(ss);
  BigDecimal newNum=new BigDecimal(numStr);
  return newNum;
}
  public static String delezero(String old){
     boolean result= old.matches(\"^[-+]?(([0-9]+)([.]([0-9]+))?|([.]([0-9]+))?)$\"); 
     if(result&&old!=null&&!\"\".equals(old)){
       String newStr=old;
        if(old.contains(\".0\")){
          old=newStr.substring(0, old.length()-2);
        }
        return old;
     }else{
       return old;
     }
    
  }