JAVA 用時間生成主鍵ID

/** 
      *   生成主鍵(19位數字)
      *  主鍵生成方式,年月日時分秒毫秒的時間戳 例如：1810311557430000845
      */ 
    public static synchronized Long getUUIDTOLongNew(){
        try {
            TimeUnit.NANOSECONDS.sleep(1000000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        String msg=""; 
        Date date = new Date(); 
        SimpleDateFormat sdf = new SimpleDateFormat("yyMMddHHmmssSSSSSSS"); //1810311557430000845
//        msg = sdf.format(date).substring(2); 
        return Long.parseLong(sdf.format(date));
    }

 /** 
 * 生成主鍵(17位數字)
 * 主鍵生成方式,年月日時分秒毫秒的時間戳 例如：180910094204299
 */ 
public static synchronized Long getUUIDTOLong(){
 try {
 Thread.sleep(1);
 } catch (InterruptedException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }
 String msg=""; 
 Date date = new Date(); 
 SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS"); 
 msg = sdf.format(date).substring(2); 
 return Long.parseLong(msg);
}