关于字符串日期的转换！

public String FullIt(String date){
    String returnString="";
    String month = date.substring(date.indexOf("-")+1,date.lastIndexOf("-"));
    if (month.length()!=2)
      month="0"+month;
    String day = date.substring(date.lastIndexOf("-")+1);
    if (day.length()!=2)
      day="0"+day;
    returnString = date.substring(0,date.indexOf("-"))+"-"+month+"-"+day;
    return returnString;
  }